OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C FEBRUARY 1989 REVISED SEPTEMBER 2000
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
Direct Replacements for PMI and LTC OP27
and OP37 Series
Features of OP27A, OP27C, OP37A, and
OP37C:
D
Maximum Equivalent Input Noise Voltage:
3.8 nV/
Hz at 1 kHz
5.5 nV/
Hz at 10 kHz
D
Very Low Peak-to-Peak Noise Voltage at
0.1 Hz to 10 Hz . . . 80 nV Typ
D
Low Input Offset Voltage . . . 25
V Max
D
High Voltage Amplification . . . 1 V/
V Min
Feature of OP37 Series:
D
Minimum Slew Rate . . . 11 V/
s
description
The OP27 and OP37 operational amplifiers
combine outstanding noise performance with
excellent precision and high-speed specifica-
tions. The wideband noise is only 3 nV/
Hz and
with the 1/f noise corner at 2.7 Hz, low noise is
maintained for all low-frequency applications.
The outstanding characteristics of the OP27 and
OP37 make these devices excellent choices
for low-noise amplifier applications requiring
precision performance and reliability. Additionally,
the OP37 is free of latch-up in high-gain,
large-capacitive-feedback configurations.
The OP27 series is compensated for unity gain.
The OP37 series is decompensated for increased
bandwidth and slew rate and is stable down to a
gain of 5.
The OP27A, OP27C, OP37A, and OP37C are characterized for operation over the full military temperature
range of 55
C to 125
C. The OP27E, OP27G, OP37E, and OP37G are characterized for operation from 25
C
to 85
C.
AVAILABLE OPTIONS
VIOmax
STABLE
PACKAGE
TA
VIOmax
AT 25
C
STABLE
GAIN
CERAMIC DIP
(JG)
CHIP CARRIER
(FK)
PLASTIC DIP
(P)
25
V
1
--
--
OP27EP
25
C to 85
C
25
V
5
--
--
OP37EP
25
C to 85
C
100
V
1
--
--
OP27GP
100
V
5
--
--
OP37GP
25
V
1
OP27AJG
OP27AFK
--
55
C to 125
C
25
V
5
OP37AJG
OP37AFK
--
55
C to 125
C
100
V
1
OP27CJG
--
--
100
V
5
OP37CJG
--
--
Copyright
2000, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
1
2
3
4
8
7
6
5
V
IO
TRIM
IN
IN +
V
CC
V
IO
TRIM
V
CC +
OUT
NC
JG OR P PACKAGE
(TOP VIEW)
IN +
IN
OUT
VIO TRIM
1
8
6
3
2
symbol
3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
NC
V
CC +
NC
OUT
NC
NC
1N
NC
IN +
NC
FK PACKAGE
(TOP VIEW)
NC
NC
NC
NC
NC
NC
NC No internal connection
CC
V
Pin numbers are for the JG and P packages.
IO
V
TRIM
+
NC
IO
V
TRIM
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW
-NOISE HIGH-SPEED PRECISION OPERA
TIONAL-AMPLIFIER
T
emp
l
ate
R
e
l
ease
D
ate:
7
11
94
SLOS100C
FEBRUAR
Y
1989 REVISED SEPTEMBER 2000
2
POST
OFFICE BOX 655303 DALLAS,
TEXAS
75265
schematic
IN +
IN
Q3
Q1A
Q1B Q2B
Q2A
Q11
Q12
Q27
Q28
Q26
Q46
Q19
Q20
Q45
Q22
Q24
Q23
Q21
Q6
VIO TRIM
VIO TRIM
VCC +
OUT
VCC
480
A
750
A
260
A
240
A
120
A
340
A
C1
C1 = 120 pF for OP27
C1 = 15 pF for OP37
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C FEBRUARY 1989 REVISED SEPTEMBER 2000
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
CC +
(see Note 1)
22 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply voltage, V
CC
(see Note 1)
22 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duration of output short circuit
unlimited
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differential input current (see Note 2)
25 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous power dissipation
See Dissipation Rating Table
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range: OP27A, OP27C, OP37A, OP37C
55
C to 125
C
. . . . . . . . . . . . . . .
OP27E, OP27G, OP37E, OP37G
25
C to 85
C
. . . . . . . . . . . . . . . .
Storage temperature range
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: JG or FK package
300
C
. . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: P package
260
C
. . . . . . . . . . . . . . . . . . . . .
NOTES:
1. All voltage values are with respect to the midpoint between VCC + and VCC unless otherwise noted.
2. The inputs are protected by back-to-back diodes. Current-limiting resistors are not used in order to achieve low noise. Excessive
input current will flow if a differential input voltage in excess of approximately
0.7 V is applied between the inputs unless some
limiting resistance is used.
DISSIPATION RATING TABLE
PACKAGE
TA
25
C
POWER RATING
DERATING FACTOR
ABOVE TA = 25
C
TA = 85
C
POWER RATING
TA = 125
C
POWER RATING
JG
FK
P
1050 mW
1375 mW
1000 mW
8.4 mW/
C
11.0 mW/
C
8.0 mW/
C
546 mW
715 mW
520 mW
210 mW
275 mW
N/A
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C FEBRUARY 1989 REVISED SEPTEMBER 2000
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions
OP27A, OP37A
OP27C, OP37C
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
Supply voltage, VCC +
4
15
22
4
15
22
V
Supply voltage, VCC
4
15
22
4
15
22
V
Common mode input voltage VIC
VCC
=
15
V, TA = 25
C
11
11
V
Common-mode input voltage, VIC
VCC
=
15
V, TA = 55
C to 125
C
10.3
10.2
V
Operating free-air temperature, TA
55
125
55
125
C
electrical characteristics at specified free-air temperature, V
CC
=
15 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
T
OP27A, OP37A
OP27C, OP37C
UNIT
PARAMETER
TEST CONDITIONS
TA
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
VIO
Input offset voltage
VO = 0,
VIC = 0
25
C
10
25
30
100
V
VIO
Input offset voltage
O
,
IC
RS = 50
, See Note 3
Full range
60
300
V
VIO
Average temperature
coefficient of input
offset voltage
Full range
0.2
0.6
0.4
1.8
V/
C
Long-term drift of input
offset voltage
See Note 4
0.2
1
0.4
2
V/mo
IIO
Input offset current
VO = 0
VIC = 0
25
C
7
35
12
75
nA
IIO
Input offset current
VO = 0,
VIC = 0
Full range
50
135
nA
IIB
Input bias current
VO = 0
VIC = 0
25
C
10
40
15
80
nA
IIB
Input bias current
VO = 0,
VIC = 0
Full range
60
150
nA
VICR
Common-mode input
25
C
11
to
11
11
to
11
V
VICR
voltage range
Full range
10.3
to
10.3
10.5
to
10.5
V
RL
2 k
12
13.8
11.5
13.5
VOM
Peak output voltage swing
RL
0.6 k
10
11.5
10
11.5
V
RL
2 k
Full range
11.5
10.5
RL
2 k
, VO =
10 V
1000
1800
700
1500
Large signal differential
RL
1 k
, VO =
10 V
800
1500
1500
AVD
Large-signal differential
voltage amplification
RL
0.6 k
, VO =
1 V,
VCC
=
4 V
250
700
200
500
V/mV
RL
2 k
, VO =
10 V
Full range
600
300
ri(CM)
Common-mode input
resistance
3
2
G
ro
Output resistance
VO = 0,
IO = 0
25
C
70
70
CMRR
Common-mode rejection
VIC =
11 V
25
C
114
126
100
120
dB
CMRR
j
ratio
VIC =
10 V
Full range
110
94
dB
kSVR
Supply voltage rejection
VCC
=
4 V to
18 V
25
C
100
120
94
118
dB
kSVR
y
g
j
ratio
VCC
=
4.5 V to
18 V
Full range
96
86
dB
Full range is 55
C to 125
C.
NOTES:
3. Input offset voltage measurements are performed by automatic test equipment approximately 0.5 seconds after applying power.
4. Long-term drift of input offset voltage refers to the average trend line of offset voltage versus time over extended periods after the
first 30 days of operation. Excluding the initial hour of operation, changes in VIO during the first 30 days are typically 2.5
V
(see Figure 3).
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C FEBRUARY 1989 REVISED SEPTEMBER 2000
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions
MIN
NOM
MAX
UNIT
Supply voltage, VCC +
4
15
22
V
Supply voltage, VCC
4
15
22
V
Common mode input voltage VIC
VCC
=
15
V, TA = 25
C
11
V
Common-mode input voltage, VIC
VCC
=
15
V, TA = 55
C to 125
C
10.5
V
Operating free-air temperature, TA
25
85
C
electrical characteristics at specified free-air temperature, V
CC
=
15 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
T
OP27E, OP37E
OP27G, OP37G
UNIT
PARAMETER
TEST CONDITIONS
TA
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
VIO
Input offset voltage
VO = 0,
VIC = 0
25
C
10
25
30
100
V
VIO
Input offset voltage
O
,
IC
RS = 50
, See Note 3
Full range
60
220
V
VIO
Average temperature
coefficient of input
offset voltage
Full range
0.2
0.6
0.4
1.8
V/
C
Long-term drift of input
offset voltage
See Note 4
0.2
1
0.4
2
V/mo
IIO
Input offset current
VO = 0
VIC = 0
25
C
7
35
12
75
nA
IIO
Input offset current
VO = 0,
VIC = 0
Full range
50
135
nA
IIB
Input bias current
VO = 0
VIC = 0
25
C
10
40
15
80
nA
IIB
Input bias current
VO = 0,
VIC = 0
Full range
60
150
nA
VICR
Common-mode input
25
C
11
to
11
11
to
11
V
VICR
voltage range
Full range
10.3
to
10.3
10.5
to
10.5
V
P
k
t
t
lt
RL
2 k
12
13.8
11.5
13.5
VOM
Peak output voltage
swing
RL
0.6 k
10
11.5
10
11.5
V
swing
RL
2 k
Full range
11.5
10.5
RL
2 k
, VO =
10 V
1000
1800
700
1500
Large signal differential
RL
1 k
, VO =
10 V
800
1500
1500
AVD
Large-signal differential
voltage amplification
RL
0.6 k
, VO =
1 V,
VCC
=
4 V
250
700
200
500
V/mV
RL
2 k
, VO =
10 V
Full range
600
450
ri(CM)
Common-mode input
resistance
3
2
G
ro
Output resistance
VO = 0,
IO = 0
25
C
70
70
CMRR
Common-mode rejection
VIC =
11 V
25
C
114
126
100
120
dB
CMRR
j
ratio
VIC =
10 V
Full range
110
96
dB
kSVR
Supply voltage rejection
VCC
=
4 V to
18 V
25
C
100
120
94
118
dB
kSVR
y
g
j
ratio
VCC
=
4.5 V to
18 V
Full range
96
90
dB
Full range is 25
C to 85
C.
NOTES:
3. Input offset voltage measurements are performed by automatic test equipment approximately 0.5 seconds after applying power.
4. Long-term drift of input offset voltage refers to the average trend line of offset voltage versus time over extended periods after the
first 30 days of operation. Excluding the initial hour of operation, changes in VIO during the first 30 days are typically 2.5
V
(see Figure 3).
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C FEBRUARY 1989 REVISED SEPTEMBER 2000
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
OP27 operating characteristics over operating free-air temperature range, V
CC
=
15 V
PARAMETER
TEST CONDITIONS
OP27A, OP27E
OP27C, OP27G
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
SR
Slew rate
AVD
1,
RL
2 k
1.7
2.8
1.7
2.8
V/
s
VN(PP)
Peak-to-peak equivalent
input noise voltage
f = 0.1 Hz to 10 Hz, RS = 20
,
See Figure 34
0.08
0.18
0.09
0.25
V
f = 10 Hz,
RS = 20
3.5
5.5
3.8
8
Vn
Equivalent input noise voltage
f = 30 Hz,
RS = 20
3.1
4.5
3.3
5.6
nV/
Hz
f = 1 kHz,
RS = 20
3
3.8
3.2
4.5
f = 10 Hz,
See Figure 35
1.5
4
1.5
In
Equivalent input noise current
f = 30 Hz,
See Figure 35
1
2.3
1
pA/
Hz
f = 1 kHz,
See Figure 35
0.4
0.6
0.4
0.6
Gain-bandwidth product
f = 100 kHz
5
8
5
8
MHz
OP37 operating characteristics over operating free-air temperature range, V
CC
=
15 V
PARAMETER
TEST CONDITIONS
OP37A, OP37E
OP37C, OP37G
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
SR
Slew rate
AVD
5,
RL
2 k
11
17
11
17
V/
s
VN(PP)
Peak-to-peak equivalent
input noise voltage
f = 0.1 Hz to 10 Hz, RS = 20
,
See Figure 34
0.08
0.18
0.09
0.25
V
E
i
l
t i
t
i
f = 10 Hz,
RS = 20
3.5
5.5
3.8
8
Vn
Equivalent input noise
voltage
f = 30 Hz,
RS = 20
3.1
4.5
3.3
5.6
nV/
Hz
voltage
f = 1 kHz,
RS = 20
3
3.8
3.2
4.5
f = 10 Hz,
See Figure 35
1.5
4
1.5
In
Equivalent input noise current
f = 30 Hz,
See Figure 35
1
2.3
1
pA/
Hz
f = 1 kHz,
See Figure 35
0.4
0.6
0.4
0.6
Gain bandwidth product
f = 10 kHz
45
63
45
63
MHz
Gain-bandwidth product
AV
5,
f = 1 MHz
40
40
MHz
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C FEBRUARY 1989 REVISED SEPTEMBER 2000
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
VIO
Input offset voltage
vs Temperature
1
VIO
Change in input offset voltage
vs Time after power on
vs Time (long-term drift)
2
3
IIO
Input offset current
vs Temperature
4
IIB
Input bias current
vs Temperature
5
VICR
Common-mode input voltage range
vs Supply voltage
6
VOM
Maximum peak output voltage
vs Load resistance
7
VO(PP) Maximum peak-to-peak output voltage
vs Frequency
8, 9
AVD
Differential voltage amplification
vs Supply voltage
vs Load resistance
vs Frequency
10
11
12, 13, 14
CMRR
Common-mode rejection ratio
vs Frequency
15
kSVR
Supply voltage rejection ratio
vs Frequency
16
SR
Slew rate
vs Temperature
vs Supply voltage
vs Load resistance
17
18
19
m
Phase margin
vs Temperature
20, 21
Phase shift
vs Frequency
12, 13
Vn
Equivalent input noise voltage
vs Bandwidth
vs Source resistance
vs Supply voltage
vs Temperature
vs Frequency
22
23
24
25
26
In
Equivalent input noise current
vs Frequency
27
Gain-bandwidth product
vs Temperature
20, 21
IOS
Short-circuit output current
vs Time
28
ICC
Supply current
vs Supply voltage
29
Pulse response
Small signal
Large signal
30, 32
31, 33
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C FEBRUARY 1989 REVISED SEPTEMBER 2000
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
100
80
60
40
20
0
20
40
60
80
100
50
25
0
25
50
75
100
125
Input Offset V
oltage
V
TA Free-Air Temperature
C
INPUT OFFSET VOLTAGE OF
REPRESENTATIVE INDIVIDUAL UNITS
vs
FREE-AIR TEMPERATURE
VCC
=
15 V
10
5
0
WARM-UP CHANGE IN
INPUT OFFSET VOLTAGE
vs
ELAPSED TIME
1
2
3
4
5
Time After Power On minutes
IO
V
V
IO
Change in Input Offset V
oltage
V
VCC
=
15 V
TA = 25
C
OP27CP/GP
OP37CP/GP
OP27C/37C
OP27A/37A
OP27A/37A
OP27E/37E
OP27C/37C
OP27G/37G
OP27AP/EP
OP37AP/EP
Figure 1
Figure 2
LONG-TERM DRIFT OF INPUT OFFSET VOLTAGE OF
REPRESENTATIVE INDIVIDUAL UNITS
6
2
4
0
2
4
6
0
1
2
3
4
5
6
7
8
Time months
0.2-
V/mo Trend Line
0.2-
V/mo Trend Line
V
IO
Change in Input Offset V
oltage
V
Figure 3
Data for temperatures below 25
C and above 85
C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C FEBRUARY 1989 REVISED SEPTEMBER 2000
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
INPUT OFFSET CURRENT
vs
FREE-AIR TEMPERATURE
Input Offset Current nA
TA Free-Air Temperature
C
50
40
30
20
10
0
75
50
25
0
50
75
100
125
25
VCC
=
15 V
OP27C/G
OP37C/G
OP27A/E
OP37A/E
INPUT BIAS CURRENT
vs
FREE-AIR TEMPERATURE
TA Free-Air Temperature
C
50
40
30
20
10
0
50 25
0
50
75
100
125
25
I IO
Input Bias Current nA
I IB
75
OP27C/G
OP37C/G
OP27A/E
OP37A/E
VCC
=
15 V
Figure 4
Figure 5
20
COMMON-MODE INPUT VOLTAGE RANGE LIMITS
vs
SUPPLY VOLTAGE
0
5
10
15
20
VCC + Supply Voltage V
VICR Common-Mode Input V
oltage Range Limits V
TA = 55
C
TA = 125
C
TA = 55
C
TA = 125
C
TA = 25
C
TA = 25
C
Maximum Peak Output V
oltage V
V
OM
MAXIMUM PEAK OUTPUT VOLTAGE
vs
LOAD RESISTANCE
18
16
14
12
10
8
6
4
2
0
0.1
1
10
RL Load Resistance k
16
12
8
4
0
4
8
12
16
VCC
=
15 V
TA = 25
C
Positive
Swing
Negative
Swing
V
ICR
Figure 6
Figure 7
Data for temperatures below 25
C and above 85
C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
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TYPICAL CHARACTERISTICS
1 k
V
OP27
MAXIMUM PEAK-TO-PEAK
OUTPUT VOLTAGE
vs
FREQUENCY
OPP
Maximum Peak-to-Peak Output V
oltage V
28
24
20
16
12
8
4
10 k
100 k
1 M
10 M
f Frequency Hz
0
10 k
OP37
MAXIMUM PEAK-TO-PEAK
OUTPUT VOLTAGE
vs
FREQUENCY
28
24
20
16
12
8
4
100 k
1 M
10 M
f Frequency Hz
0
V
O(PP)
V
OPP
Maximum Peak-to-Peak Output V
oltage V
V
O(PP)
VCC
=
15 V
RL = 1 k
TA = 25
C
VCC
=
15 V
RL = 1 k
TA = 25
C
Figure 8
Figure 9
2400
2500
10
OP27A, OP27E, OP37A, OP37E
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
TOTAL SUPPLY VOLTAGE
A
OP27A, OP27E, OP37A, OP37E
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
LOAD RESISTANCE
VD
Differential V
oltage
Amplification
V/mV
A
VD
Differential V
oltage
Amplification
V/mV
0.1
1
10
100
RL Load Resistance k
VCC + VCC Total Supply Voltage V
0
20
30
40
50
2000
1500
1000
500
0
2200
2000
1800
1600
1400
1200
1000
800
600
400
VO =
10 V
TA = 25
C
RL = 1 k
VCC
=
15 V
VO =
10 V
TA = 25
C
RL = 2 k
Figure 10
Figure 11
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
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TYPICAL CHARACTERISTICS
1
OP27
LARGE-SIGNAL DIFFERENTIAL
VOLTAGE AMPLIFICATION AND PHASE SHIFT
vs
FREQUENCY
25
20
15
10
5
0
5
10
100
f Frequency Hz
10
0.1
OP37
LARGE-SIGNAL DIFFERENTIAL
VOLTAGE AMPLIFICATION AND PHASE SHIFT
vs
FREQUENCY
60
50
40
30
20
10
0
1
100
f Frequency MHz
10
VCC
=
15 V
RL = 1 k
TA = 25
C
Differential V
oltage
Amplification dB
A
VD
80
100
120
140
160
180
200
220
Phase Shift
10
80
100
120
140
160
180
200
220
Phase Shift
AVD
Phase Shift
AVD
Phase Shift
Differential V
oltage
Amplification dB
A
VD
m = 70
m = 71
VCC
=
15 V
RL = 1 k
TA = 25
C
Figure 12
Figure 13
OP27A, OP27E, OP37A, OP37E
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
FREQUENCY
f Frequency Hz
VCC
=
15 V
RL = 2 k
TA = 25
C
CMRR Common-Mode Rejection Ratio dB
1 k
OP27A, OP27E, OP37A, OP37E
COMMON-MODE REJECTION RATIO
vs
FREQUENCY
140
10 k
100 k
1 M
10 M
f Frenquency Hz
40
VCC
=
15 V
VIC =
10 V
TA = 25
C
120
100
80
60
140
120
100
80
60
40
20
0
20
0.1
1
10
100
1 k
10 k
1 M
100 M
Differential V
oltage
Amplification dB
A
VD
OP37A/E
OP27A/E
OP27A/E
OP37A/E
Figure 14
Figure 15
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
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TYPICAL CHARACTERISTICS
SUPPLY VOLTAGE REJECTION RATIO
vs
FREQUENCY
f Frequency Hz
Supply V
oltage Rejection Ratio dB
k
VCC
=
4 V to
18 V
TA = 25
C
SLEW RATE
vs
FREE-AIR TEMPERATURE
TA Free Air Temperature
C
VCC
=
15 V
RL
2 k
OP37
(AVD
5)
SVR
160
140
120
100
80
60
40
20
0
20
18
16
14
12
10
8
6
4
2
0
1
10
100
1 k
10 k 100 k 1 M
10 M 100 M
50
25
0
25
50
75
100
125
SR Slew Rate V/
s
OP27
(AVD
1)
Positive
Supply
Negative
Supply
Figure 16
Figure 17
OP37
SLEW RATE
vs
SUPPLY VOLTAGE
VCC
Supply Voltage V
AVD = 5
RL = 2 k
TA = 25
C
SR Slew Rate V/
Rise
0.1
OP37
SLEW RATE
vs
LOAD RESISTANCE
19
1
100
f Frequency Hz
10
s
SR Slew Rate V/
s
20
15
10
5
0
18
17
16
15
3
6
9
12
15
18
21
Fall
VCC
=
15 V
AVD = 5
VO(PP) = 20 V
TA = 25
C
Figure 18
Figure 19
Data for temperatures below 25
C and above 85
C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
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TYPICAL CHARACTERISTICS
OP27
PHASE MARGIN AND
GAIN-BANDWIDTH PRODUCT
vs
FREE-AIR TEMPERATURE
Gain-Bandwidth Product MHz
TA Free-Air Temperature
C
75
50
25
0
50
75
100
125
25
VCC
=
15 V
GBW (f = 100 kHz)
75
65
55
45
35
8.6
8.2
7.8
7.4
7
Phase Margin
80
75
70
65
60
55
50
45
40
35
30
50
25
0
25
50
75
100
125
TA Free-Air Temperature
C
OP37
PHASE MARGIN AND
GAIN-BANDWIDTH PRODUCT
vs
FREE-AIR TEMPERATURE
GBW (f = 10 kHz)
85
80
75
70
65
60
55
50
45
40
m
m
Phase Margin
m
m
VCC
=
15 V
Gain-Bandwidth Product MHz
80
70
60
50
40
85
10.6
10.2
9.8
9.4
9
11
Figure 20
Figure 21
V
EQUIVALENT INPUT NOISE VOLTAGE
vs
BANDWIDTH
VCC
=
15 V
RS = 20
TA = 25
C
nV/
Hz
n
Equivalent Input Noise V
oltage
T
otal Equivalent Input Noise V
oltage
V
10
1
0.1
0.01
0.1
1
10
100
Bandwidth kHz
(0.1 Hz to frequency indicated)
TOTAL EQUIVALENT INPUT NOISE VOLTAGE
vs
SOURCE RESISTANCE
10 k
1 k
100
100
10
1
RS Source Resistance
+
RS = R1 + R2
R1
R2
f = 1 kHz
Resistor Noise Only
f = 10 Hz
VCC
=
15 V
BW = 1 Hz
TA = 25
C
Figure 22
Figure 23
Data for temperatures below 25
C and above 85
C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
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TYPICAL CHARACTERISTICS
nV/
Hz
OP27A, OP27E, OP37A, OP37E
EQUIVALENT INPUT NOISE VOLTAGE
vs
TOTAL SUPPLY VOLTAGE
VCC + VCC Total Supply Voltage V
RS = 20
BW = 1 Hz
TA = 25
C
f = 10 Hz
20
15
10
5
0
0
10
20
30
40
f = 1 kHz
50
25
0
25
50
75
100
125
TA Free-Air Temperature
C
OP27A, OP27E, OP37A, OP37E
EQUIVALENT INPUT NOISE VOLTAGE
vs
FREE-AIR TEMPERATURE
VCC
=
15 V
RS = 20
BW = 1 Hz
5
4
3
2
1
V
n
Equivalent Input Noise V
oltage
nV/
Hz
V
n
Equivalent Input Noise V
oltage
f = 10 Hz
f = 1 kHz
Figure 24
Figure 25
nV/
Hz
V
n
Equivalent Input Noise V
oltage
pA/
Hz
I
n
Equivalent Input Noise Current
OP27A, OP27E, OP37A, OP37E
EQUIVALENT INPUT NOISE VOLTAGE
vs
FREQUENCY
1
10
100
1000
f Frequency Hz
EQUIVALENT INPUT NOISE CURRENT
vs
FREQUENCY
10
1
0.1
f Frequency Hz
1/f Corner = 140 Hz
10
9
8
7
6
5
4
3
2
1
1/f Corner = 2.7 Hz
10
100
1 k
10 k
VCC
=
15 V
RS = 20
BW = 1 Hz
TA = 25
C
VCC
=
15 V
BW = 1 Hz
TA = 25
C
Figure 26
Figure 27
Data for temperatures below 25
C and above 85
C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C FEBRUARY 1989 REVISED SEPTEMBER 2000
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TYPICAL CHARACTERISTICS
0
1
2
3
4
5
60
50
40
30
20
10
SHORT-CIRCUIT OUTPUT CURRENT
vs
ELAPSED TIME
SUPPLY CURRENT
vs
TOTAL SUPPLY VOLTAGE
VCC + VCC Total Supply Voltage V
TA = 125
C
5
4
3
2
1
5
15
25
35
45
I CC
Supply Current mA
t Time minutes
I OS
Short-Circuit Output Current mA
VCC
=
15 V
TA = 25
C
IOS +
TA = 55
C
OSI
CCI
IOS
TA = 25
C
Figure 28
Figure 29
V
OP27
VOLTAGE FOLLOWER
SMALL-SIGNAL
PULSE RESPONSE
80
60
40
20
0
20
40
60
80
O
Output V
oltage
mV
t Time
s
0
0.5
1
1.5
2
2.5
3
VCC
=
15 V
AV = 1
CL = 15 pF
TA = 25
C
V
O
Output V
oltage
V
OP27
VOLTAGE FOLLOWER
LARGE-SIGNAL
PULSE RESPONSE
8
6
4
0
2
4
6
8
2
t Time
s
0
2
4
6
8
10
12
VCC
=
15 V
AV = 1
TA = 25
C
Figure 30
Figure 31
Data for temperatures below 25
C and above 85
C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
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TYPICAL CHARACTERISTICS
V
OP37
VOLTAGE-FOLLOWER
SMALL-SIGNAL PULSE RESPONSE
80
60
40
20
0
20
40
60
80
O
Output V
oltage
mV
t Time
s
0
0.2
0.4
0.6
0.8
1
1.2
VCC
=
15 V
AV = 5
CL = 15 pF
TA = 25
C
V
O
Output V
oltage
V
OP37
VOLTAGE-FOLLOWER
LARGE-SIGNAL PULSE RESPONSE
8
6
4
0
2
4
6
8
2
t Time
s
0
1
2
3
4
5
6
VCC
=
15 V
AV = 5
TA = 25
C
Figure 32
Figure 33
APPLICATION INFORMATION
general
The OP27 and OP37 series devices can be inserted directly onto OP07, OP05,
A725, and SE5534 sockets
with or without removing external compensation or nulling components. In addition, the OP27 and OP37 can
be fitted to
A741 sockets by removing or modifying external nulling components.
noise testing
Figure 34 shows a test circuit for 0.1-Hz to 10-Hz peak-to-peak noise measurement of the OP27 and OP37.
The frequency response of this noise tester indicates that the 0.1-Hz corner is defined by only one zero.
Because the time limit acts as an additional zero to eliminate noise contributions from the frequency band below
0.1 Hz, the test time to measure 0.1-Hz to 10-Hz noise should not exceed 10 seconds.
Measuring the typical 80-nV peak-to-peak noise performance of the OP27 and OP37 requires the following
special test precautions:
1.
The device should be warmed up for at least five minutes. As the operational amplifier warms up, the
offset voltage typically changes 4
V due to the chip temperature increasing from 10
C to 20
C starting
from the moment the power supplies are turned on. In the 10-s measurement interval, these
temperature-induced effects can easily exceed tens of nanovolts.
2.
For similar reasons, the device should be well shielded from air currents to eliminate the possibility of
thermoelectric effects in excess of a few nanovolts, which would invalidate the measurements.
3.
Sudden motion in the vicinity of the device should be avoided, as it produces a feedthrough effect that
increases observed noise.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
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APPLICATION INFORMATION
noise testing (continued)
4.3 k
110 k
2.2
F
Oscilloscope
Rin = 1 M
22
F
100 k
0.1
F
LT1001
4.7
F
2 k
100 k
10
0.1
F
Voltage
Gain = 50,000
+
OP27/OP37
Device
Under
Test
24.3 k
0.01
0.1
1
10
100
A
VD
Differential V
oltage
Amplification
dB
100
90
80
70
60
50
40
30
f Frequency Hz
+
NOTE: All capacitor values are for nonpolarized capacitors only.
Figure 34. 0.1-Hz to 10-Hz Peak-to-Peak Noise Test Circuit and Frequency Response
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
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18
POST OFFICE BOX 655303
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APPLICATION INFORMATION
noise testing (continued)
When measuring noise on a large number of units, a noise-voltage density test is recommended. A 10-Hz
noise-voltage density measurement correlates well with a 0.1-Hz to 10-Hz peak-to-peak noise reading since
both results are determined by the white noise and the location of the 1/f corner frequency.
Figure 35 shows a circuit measuring current noise and the formula for calculating current noise.
+
10k
Vno
100
500 k
500 k
[Vno2 (130 nV)2]1/2
1 M
100
In =
Figure 35. Current Noise Test Circuit and Formula
offset voltage adjustment
The input offset voltage and temperature coefficient of the OP27 and OP37 are permanently trimmed to a low
level at wafer testing. However, if further adjustment of V
IO
is necessary, using a 10-k
nulling potentiometer
as shown in Figure 36 does not degrade the temperature coefficient
VIO
. Trimming to a value other than zero
creates an
VIO
of V
IO
/300
V/
C. For example, if V
IO
is adjusted to 300
V, the change in
VIO
is 1
V/
C.
The adjustment range with a 10-k
potentiometer is approximately
2.5 mV. If a smaller adjustment range is
needed, the sensitivity and resolution of the nulling can be improved by using a smaller potentiometer in
conjunction with fixed resistors. The example in Figure 37 has an approximate null range of
200
V.
+
15 V
Output
2
3
7
8
4
1
Input
6
15 V
10 k
15 V
Output
2
3
7
8
4
1
Input
6
4.7 k
Figure 36. Standard Input Offset
Voltage Adjustment
Figure 37. Input Offset Voltage Adjustment With
Improved Sensitivity
15 V
1 k
4.7 k
offset voltage and drift
Unless proper care is exercised, thermoelectric effects caused by temperature gradients across dissimilar
metals at the contacts to the input terminals can exceed the inherent temperature coefficient
V
IO
of the
amplifier. Air currents should be minimized, package leads should be short, and the two input leads should be
close together and at the same temperature.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100C FEBRUARY 1989 REVISED SEPTEMBER 2000
19
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APPLICATION INFORMATION
offset voltage and drift (continued)
The circuit shown in Figure 38 measures offset voltage. This circuit can also be used as the burn-in configuration
for the OP27 and OP37 with the supply voltage increased to 20 V, R1 = R3 = 10 k
, R2 = 200
, and
A
VD
= 100.
15 V
+
15 V
R1
50 k
R2
100
R3
50 k
VO = 1000 VIO
2
3
6
7
4
NOTE A: Resistors must have low thermoelectric potential.
Figure 38. Test Circuit for Offset Voltage and Offset Voltage Temperature Coefficient
unity gain buffer applications
The resulting output waveform, when R
f
100
and the input is driven with a fast large-signal pulse (> 1 V),
is shown in the pulsed-operation diagram in Figure 39.
+
Rf
Output
2.8 V/
s
OP27
Figure 39. Pulsed Operation
During the initial (fast-feedthrough-like) portion of the output waveform, the input protection diodes effectively
short the output to the input, and a current, limited only by the output short-circuit protection, is drawn by the
signal generator. When R
f
500
, the output is capable of handling the current requirements (load
current
20 mA at 10 V), the amplifier stays in its active mode, and a smooth transition occurs. When
R
f
> 2 k
, a pole is created with R
f
and the amplifier's input capacitance, creating additional phase shift and
reducing the phase margin. A small capacitor (20 pF to 50 pF) in parallel with R
f
eliminates this problem.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
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20
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APPLICATION INFORMATION
unity gain buffer applications (continued)
To Gate
Drive
#1
+
Typical
Multiplexing
FET Switches
#2
+
#24
+
Cold-Junction
Circuitry
+
+
Output
0.05
F
100 k
High-Quality
Single-Point Ground
10
AVD = 10,000
Type S Thermocouples
5.4
V/
C at 0
C
60
40
20
0
0
2
4
6
Noise V
oltage nV
80
100
t Time seconds
120
8
10
OP27
NOTE A: If 24 channels are multiplexed per second and the output is required to settle to 0.1 % accuracy, the amplifier's bandwidth cannot be
limited to less than 30 Hz. The peak-to-peak noise contribution of the OP27 will still be only 0.11
V, which is equivalent to an error
of only 0.02
C.
Figure 40. Low-Noise, Multiplexed Thermocouple Amplifier and 0.1-Hz To 10-Hz
Peak-to-Peak Noise Voltage
IMPORTANT NOTICE
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TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
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Customers are responsible for their applications using TI components.
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