Document Outline
- FEATURES
- APPLICATIONS
- DESCRIPTION
- OPA355 RELATED PRODUCTS
- ABSOLUTE MAXIMUM RATINGS(
- PACKAGE/ORDERING INFORMATION(1)
- PIN CONFIGURATIONS
- ELECTRICAL CHARACTERISTICS: VS = +2.7V to +5.5V Single-Supply
- TYPICAL CHARACTERISTICS
- APPLICATIONS INFORMATION
- PCB LAYOUT
- OPERATING VOLTAGE
- ENABLE FUNCTION
- OUTPUT DRIVE
- VIDEO
- WIDEBAND VIDEO MULTIPLEXING
- INPUT AND ESD PROTECTION
OPA355
OPA2355
OPA3355
SBOS195D MARCH 2001 REVISED JANUARY 2004
www.ti.com
DESCRIPTION
The OPA355 series high-speed, voltage-feedback CMOS
operational amplifiers are designed for video and other
applications requiring wide bandwidth. The OPA355 is unity-
gain stable and can drive large output currents. In addition,
the OPA355 has a digital shutdown (Enable) function. This
feature provides power savings during idle periods and
places the output in a high-impedance state to support output
multiplexing. Differential gain is 0.02% and differential phase
is 0.05
. Quiescent current is only 8.3mA per channel.
The OPA355 is optimized for operation on single or dual
supplies as low as 2.5V (
1.25V) and up to 5.5V (
2.75V).
Common-mode input range for the OPA355 extends 100mV
below ground and up to 1.5V from V+. The output swing is
within 100mV of the rails, supporting wide dynamic range.
The OPA355 series is available in single (SOT23-6 and
SO-8), dual (MSOP-10), and triple (TSSOP-14 and SO-14)
versions. Multichannel versions feature completely indepen-
dent circuitry for lowest crosstalk and freedom from interac-
tion. All are specified over the extended 40
C to +125
C
range.
FEATURES
q
UNITY-GAIN BANDWIDTH: 450MHz
q
WIDE BANDWIDTH: 200MHz GBW
q
HIGH SLEW RATE: 360V/
s
q
LOW NOISE: 5.8nV/
Hz
q
EXCELLENT VIDEO PERFORMANCE:
DIFF GAIN: 0.02%, DIFF PHASE: 0.05
0.1dB GAIN FLATNESS: 75MHz
q
INPUT RANGE INCLUDES GROUND
q
RAIL-TO-RAIL OUTPUT (within 100mV)
q
LOW INPUT BIAS CURRENT: 3pA
q
LOW SHUTDOWN CURRENT: 3.4
A
q
ENABLE/DISABLE TIME: 100ns/30ns
q
THERMAL SHUTDOWN
q
SINGLE-SUPPLY OPERATING RANGE: 2.5V to 5.5V
q
MicroSIZE PACKAGES
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.
Copyright 2001-2004, Texas Instruments Incorporated
200MHz, CMOS
OPERATIONAL AMPLIFIER WITH SHUTDOWN
APPLICATIONS
q
VIDEO PROCESSING
q
ULTRASOUND
q
OPTICAL NETWORKING, TUNABLE LASERS
q
PHOTODIODE TRANSIMPEDANCE AMPS
q
ACTIVE FILTERS
q
HIGH-SPEED INTEGRATORS
q
ANALOG-TO-DIGITAL (A/D) CONVERTER
INPUT BUFFERS
q
DIGITAL-TO-ANALOG (D/A) CONVERTER
OUTPUT AMPLIFIERS
q
BARCODE SCANNERS
q
COMMUNICATIONS
OPA3
355
OPA3
355
OPA3
55
OPA2
355
OPA355 RELATED PRODUCTS
FEATURES
PRODUCT
200MHz, Rail-to-Rail Output, CMOS, No Shutdown
OPA356
38MHz, Rail-to-Rail Input/Output, CMOS
OPAx350
75MHz, Rail-to-Rail Output
OPAx631
150MHz, Rail-to-Rail Output
OPAx634
Differential Input/Output, 3.3V Supply
THS412x
OPA355
Out
V+
V Enable
V
IN
+V
IN
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.
All trademarks are the property of their respective owners.
OPA355, 2355, 3355
SBOS195D
2
www.ti.com
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage, V+ to V ................................................................... 7.5V
Signal Input Terminals, Voltage
(2)
.................... (V) 0.5V to (V+) + 0.5V
Current
(2)
..................................................... 10mA
Enable Input ...................................................... (V) 0.5V to (V+) + 0.5V
Output Short-Circuit
(3)
.............................................................. Continuous
Operating Temperature .................................................. 55
C to +150
C
Storage Temperature ...................................................... 65
C to +150
C
Junction Temperature .................................................................... +160
C
Lead Temperature (soldering, 10s) ............................................... +300
C
NOTES: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability. These are stress ratings only, and functional operation of the
device at these or any other conditions beyond those specified is not implied.
(2) Input terminals are diode-clamped to the power-supply rails. Input signals
that can swing more than 0.5V beyond the supply rails should be current limited
to 10mA or less. (3) Short-circuit to ground, one amplifier per package.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degrada-
tion to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.
PIN CONFIGURATIONS
Top View
1
2
3
6
5
4
V+
Enable
In
Out
V
+In
OPA355
SOT23-6
(1)
C55
1
2
3
4
8
7
6
5
Enable
V+
Out
NC
(2)
NC
(2)
In
+In
V
OPA355
SO-8
1
2
3
4
5
10
9
8
7
6
V+
Out B
In B
+In B
Enable B
Out A
In A
+In A
V
Enable A
OPA2355
MSOP-10
A
B
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Out C
In C
+In C
V
+In B
In B
Out B
Enable A
Enable B
Enable C
V+
+In A
In A
Out A
OPA3355
SO-14
TSSOP-14
A
B
C
PACKAGE
PRODUCT
PACKAGE-LEAD
MARKING
OPA355
SOT23-6
C55
"
"
"
OPA355
SO-8
OPA355UA
"
"
"
OPA2355
MSOP-10
D55
"
"
"
OPA3355
TSSOP-14
OPA3355EA
"
"
"
OPA3355
SO-14
OPA3355UA
"
"
"
NOTE: (1) For the most current package and ordering information, see the
Package Option Addendum located at the end of this data sheet.
PACKAGE/ORDERING INFORMATION
(1)
NOTES: (1) Pin 1 of the SOT23-6 is
determined by orienting the package marking
as indicated in the diagram. (2) NC indicates
no internal connection.
OPA355, 2355, 3355
SBOS195D
3
www.ti.com
ELECTRICAL CHARACTERISTICS:
V
S
= +2.7V to +5.5V Single-Supply
Boldface limits apply over the specified temperature range, T
A
= 40
C to +125
C.
At T
A
= +25
C, R
F
= 604
, R
L
= 150
, and connected to V
S
/2, unless otherwise noted.
OPA355
OPA2355
OPA3355
PARAMETER
CONDITION
MIN
TYP
MAX
UNITS
OFFSET VOLTAGE
Input Offset Voltage
V
OS
V
S
= +5V
2
9
mV
Specified Temperature Range
15
mV
vs Temperature
dV
OS
/dT
Specified Temperature Range
7
V/
C
vs Power Supply
PSRR
V
S
= +2.7V to +5.5V, V
CM
= V
S
/2 0.15V
80
350
V/V
INPUT BIAS CURRENT
Input Bias Current
I
B
3
50
pA
Input Offset Current
I
OS
1
50
pA
NOISE
Input Noise Voltage Density
e
n
f = 1MHz
5.8
nV/
Hz
Current Noise Density
i
n
f = 1MHz
50
fA/
Hz
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
V
CM
(V) 0.1
(V+) 1.5
V
Common-Mode Rejection Ratio
CMRR
V
S
= +5.5V, 0.1V < V
CM
< +4.0V
66
80
dB
Specified Temperature Range
66
dB
INPUT IMPEDANCE
Differential
10
13
|| 1.5
|| pF
Common-Mode
10
13
|| 1.5
|| pF
OPEN-LOOP GAIN
V
S
= +5V, 0.3V < V
O
< 4.7V
84
92
dB
OPA355
V
S
= +5V, 0.3V < V
O
< 4.7V
80
dB
OPA2355, OPA3355
V
S
= +5V, 0.4V < V
O
< 4.6V
80
dB
FREQUENCY RESPONSE
Small-Signal Bandwidth
f
3dB
G = +1, V
O
= 100mVp-p, R
F
= 0
450
MHz
f
3dB
G = +2, V
O
= 100mVp-p, R
L
= 50
100
MHz
f
3dB
G = +2, V
O
= 100mVp-p, R
L
= 150
170
MHz
f
3dB
G = +2, V
O
= 100mVp-p, R
L
= 1k
200
MHz
Gain-Bandwidth Product
GBW
G = +10, R
L
= 1k
200
MHz
Bandwidth for 0.1dB Gain Flatness
f
0.1dB
G = +2, V
O
= 100mVp-p, R
F
= 560
75
MHz
Slew Rate
SR
V
S
= +5V, G = +2, 4V Output Step
300/360
V/
s
Rise-and-Fall Time
G = +2, V
O
= 200mVp-p, 10% to 90%
2.4
ns
G = +2, V
O
= 2Vp-p, 10% to 90%
8
ns
Settling Time, 0.1%
V
S
= +5V, G = +2, 2V Output Step
30
ns
0.01%
V
S
= +5V, G = +2, 2V Output Step
120
ns
Overload Recovery Time
V
IN
Gain = V
S
8
ns
Harmonic Distortion
2nd-Harmonic
G = +2, f = 1MHz, V
O
= 2Vp-p, R
L
= 200
81
dBc
3rd-Harmonic
G = +2, f = 1MHz, V
O
= 2Vp-p, R
L
= 200
93
dBc
Differential Gain Error
NTSC, R
L
= 150
0.02
%
Differential Phase Error
NTSC, R
L
= 150
0.05
degrees
Channel-to-Channel Crosstalk
OPA2355
f = 5MHz
90
dB
OPA3355
f = 5MHz
70
dB
OUTPUT
Voltage Output Swing from Rail
V
S
= +5V, R
L
= 150
, A
OL
> 84dB
0.2
0.3
V
Voltage Output Swing from Rail
V
S
= +5V, R
L
= 1k
0.1
V
Output Current, Continuous
(1)
I
O
60
mA
Output Current, Peak
(1)
I
O
V
S
= +5V
100
mA
Output Current, Peak
(1)
I
O
V
S
= +3V
80
mA
Closed-Loop Output Impedance
f < 100kHz
0.02
POWER SUPPLY
Specified Voltage Range
V
S
2.7
5.5
V
Operating Voltage Range
2.5 to 5.5
V
Quiescent Current (per amplifier)
I
Q
V
S
= +5V, Enabled, I
O
= 0
8.3
11
mA
Specified Temperature Range
14
mA
NOTES: (1) See typical characteristic
Output Voltage Swing vs Output Current. (2) Logic LOW and HIGH levels are CMOS logic compatible. They are referenced to V.
OPA355, 2355, 3355
SBOS195D
4
www.ti.com
SHUTDOWN
Disabled (Logic-LOW Threshold)
(2)
0.8
V
Enabled (Logic-HIGH Threshold)
(2)
2
V
Enable Time
100
ns
Disable Time
30
ns
Shutdown Current (per amplifier)
V
S
= +5V, Disabled
3.4
6
A
THERMAL SHUTDOWN
Junction Temperature
Shutdown
160
C
Reset from Shutdown
140
C
TEMPERATURE RANGE
Specified Range
40
125
C
Operating Range
55
150
C
Storage Range
65
150
C
Thermal Resistance
JA
C/W
SOT-23-6, MSOP-10
150
C/W
SO-8
125
C/W
SO-14, TSSOP-14
100
C/W
NOTES: (1) See typical characteristic
Output Voltage Swing vs Output Current. (2) Logic LOW and HIGH levels are CMOS logic compatible. They are referenced to V.
ELECTRICAL CHARACTERISTICS:
V
S
= +2.7V to +5.5V Single-Supply (Cont.)
Boldface limits apply over the specified temperature range, T
A
= 40
C to +125
C.
At T
A
= +25
C, R
F
= 604
, R
L
= 150
, and connected to V
S
/2, unless otherwise noted.
OPA355
OPA2355
OPA3355
PARAMETER
CONDITION
MIN
TYP
MAX
UNITS
OPA355, 2355, 3355
SBOS195D
5
www.ti.com
TYPICAL CHARACTERISTICS
At T
A
= +25
C, V
S
= 5V, G = +2, R
F
= 604
, and R
L
= 150
connected to V
S
/2, unless otherwise noted.
NONINVERTING SMALL-SIGNAL
FREQUENCY RESPONSE
Frequency (Hz)
Normalized Gain (dB)
10M
1M
100M
1G
100k
6
3
0
3
6
9
12
15
V
O
= 0.1Vp-p
G = +2
G = +5
G = +10
G = +1
R
F
= 0
INVERTING SMALL-SIGNAL
FREQUENCY RESPONSE
Frequency (Hz)
Normalized Gain (dB)
10M
1M
100M
1G
100k
3
0
3
6
9
12
15
V
O
= 0.1Vp-p
G = 1
G = 5
G = 10
G = 2
NON-INVERTING SMALL-SIGNAL
STEP RESPONSE
Time (20ns/div)
Output V
oltage (50mV/div)
G = +2
NONINVERTING LARGE-SIGNAL
STEP RESPONSE
Time (20ns/div)
Output V
oltage (500mV/div)
G = +2
LARGE-SIGNAL DISABLE/ENABLE
RESPONSE
Time (200ns/div)
Output V
oltage (500mV/div)
4.5
3.5
2.5
1.5
0.5
Disable V
oltage (V)
Enabled
Disabled
V
OUT
f
IN
= 5MHz
0.1dB GAIN FLATNESS FOR VARIOUS R
F
Frequency (MHz)
Normalized Gain (dB)
10
100
1
0.5
0.4
0.3
0.2
0.1
0
0.1
0.2
0.3
0.4
0.5
V
O
= 0.1Vp-p
C
L
= 0pF
R
F
= 604
R
F
= 560
R
F
= 500
OPA355, 2355, 3355
SBOS195D
6
www.ti.com
TYPICAL CHARACTERISTICS
(Cont.)
At T
A
= +25
C, V
S
= 5V, G = +2, R
F
= 604
, and R
L
= 150
connected to V
S
/2, unless otherwise noted.
HARMONIC DISTORTION vs OUTPUT VOLTAGE
Output Voltage (Vp-p)
Harmonic Distortion (dBc)
2
3
4
0
1
50
60
70
80
90
100
R
L
= 200
f = 1MHz
2nd Harmonic
3rd Harmonic
HARMONIC DISTORTION vs NONINVERTING GAIN
Gain (V/V)
Harmonic Distortion (dBc)
10
1
50
60
70
80
90
100
2nd-Harmonic
3rd-Harmonic
V
O
= 2Vp-p
f = 1MHz
R
L
= 200
HARMONIC DISTORTION vs INVERTING GAIN
Gain (V/V)
Harmonic Distortion (dBc)
10
1
50
60
70
80
90
100
2nd-Harmonic
3rd-Harmonic
V
O
= 2Vp-p
f = 1MHz
R
L
= 200
HARMONIC DISTORTION vs FREQUENCY
Frequency (Hz)
Harmonic Distortion (dBc)
10M
100k
1M
50
60
70
80
90
100
2nd-Harmonic
3rd-Harmonic
V
O
= 2Vp-p
R
L
= 200
HARMONIC DISTORTION vs LOAD RESISTANCE
R
L
(
)
Harmonic Distortion (dBc)
1k
100
50
60
70
80
90
100
2nd-Harmonic
3rd-Harmonic
V
O
= 2Vp-p
f = 1MHz
INPUT VOLTAGE AND CURRENT NOISE
SPECTRAL DENSITY vs FREQUENCY
Frequency (Hz)
V
oltage Noise (nV/
Hz), Current Noise (fA/
Hz)
100M
10
100
1k
10k
100k
1M
10M
10k
1k
100
10
1
Current Noise
Voltage Noise
OPA355, 2355, 3355
SBOS195D
7
www.ti.com
TYPICAL CHARACTERISTICS
(Cont.)
At T
A
= +25
C, V
S
= 5V, G = +2, R
F
= 604
, and R
L
= 150
connected to V
S
/2, unless otherwise noted.
FREQUENCY RESPONSE FOR VARIOUS R
L
Frequency (Hz)
Normalized Gain (dB)
10M
1M
100M
1G
100k
3
0
3
6
9
12
15
R
L
= 50
R
L
= 150
R
L
= 1k
R
L
= 10k
C
L
= 0pF
V
O
= 0.1Vp-p
FREQUENCY RESPONSE FOR VARIOUS C
L
Frequency (Hz)
Normalized Gain (dB)
10M
1M
100M
1G
100k
9
6
3
0
3
6
9
12
15
R
S
= 0
V
O
= 0.1Vp-p
C
L
= 100pF
C
L
= 47pF
C
L
= 5.6pF
RECOMMENDED R
S
vs CAPACITIVE LOAD
Capacitive Load (pF)
R
S
(
)
10
100
1
120
100
80
60
40
20
0
OPA355
C
L
R
S
V
IN
V
O
1k
604
604
(1k
is
Optional)
FREQUENCY RESPONSE vs CAPACITIVE LOAD
Frequency (Hz)
Normalized Gain (dB)
10M
100M
1G
1M
3
0
3
6
9
12
15
C
L
= 100pF
R
S
= 24
C
L
= 47pF
R
S
= 36
C
L
= 5.6pF
R
S
= 80
OPA355
C
L
R
S
V
IN
V
O
1k
604
604
(1k
is
Optional)
G = +2
V
O
= 0.1Vp-p
Frequency (Hz)
10M
100M
100k
1M
1G
10k
100
90
80
70
60
50
40
30
20
10
0
PSRR
+PSRR
CMRR
COMMON-MODE REJECTION RATIO AND
POWER-SUPPLY REJECTION RATIO vs FREQUENCY
CMRR, PSRR (dB)
OPEN-LOOP GAIN AND PHASE
Frequency (Hz)
Open-Loop Gain (dB)
Open-Loop Phase (degrees)
10M
100M
100k
1M
1G
1k
10k
180
160
140
120
100
80
60
40
20
0
20
Gain
Phase
R
L
= 1k
R
L
= 150k
OPA355, 2355, 3355
SBOS195D
8
www.ti.com
TYPICAL CHARACTERISTICS
(Cont.)
At T
A
= +25
C, V
S
= 5V, G = +2, R
F
= 604
, and R
L
= 150
connected to V
S
/2, unless otherwise noted.
SHUTDOWN CURRENT vs TEMPERATURE
Temperature (
C)
Shutdown Current (
A)
65
85
105
5
25
45
135
125
55
35
15
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
S
= 5V
V
S
= 3V
V
S
= 5.5V
V
S
= 2.5V
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
FOR V
S
= 5V
Output Current (mA)
Output V
o
ltage (V)
100
50
150
200
250
0
5
4
3
2
1
0
125
C
125
C
25
C
25
C
55
C
55
C
Continuous currents above
60mA are not recommended.
SUPPLY CURRENT vs TEMPERATURE
Temperature (
C)
Supply Current (mA)
65
85
105
5
25
45
135
125
55
35
15
14
12
10
8
6
4
2
0
V
S
= 5V
V
S
= 3V
V
S
= 5.5V
V
S
= 2.5V
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
FOR V
S
= 3V
Output Current (mA)
Output V
o
ltage (V)
60
30
90
120
150
0
3
2
1
0
125
C
125
C
25
C
25
C
55
C
55
C
Continuous currents above
60mA are not recommended.
INPUT BIAS CURRENT vs TEMPERATURE
Temperature (
C)
Input Bias Current (pA)
65
85
105
5
25
45
135
125
55
35
15
10n
1n
100
10
1
COMPOSITE VIDEO
DIFFERENTIAL GAIN AND PHASE
Number of 150
Loads
dG/dP
(%/degrees)
3
2
4
1
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
dP
dG
OPA355, 2355, 3355
SBOS195D
9
www.ti.com
TYPICAL CHARACTERISTICS
(Cont.)
At T
A
= +25
C, V
S
= 5V, G = +2, R
F
= 604
, and R
L
= 150
connected to V
S
/2, unless otherwise noted.
COMMON-MODE REJECTION RATIO AND
POWER-SUPPLY REJECTION RATIO vs TEMPERATURE
Temperature (
C)
CMRR, PSRR (dB)
65
85
105
5
25
45
135
125
55
35
15
100
90
80
70
60
50
Power-Supply Rejection Ratio
Common-Mode Rejection Ratio
OFFSET VOLTAGE PRODUCTION DISTRIBUTION
Offset Voltage (mV)
Percent of
Amplifiers (%)
6
7
8
9
5 4 3 2 1 0 1
2 3 4 5 6 7 8 9
20
18
16
14
12
10
8
6
4
2
0
OPEN-LOOP GAIN vs TEMPERATURE
Temperature (
C)
Open-Loop Gain (dB)
65
85
105
5
25
45
135
125
55
35
15
110
100
90
80
70
60
R
L
= 1k
R
L
= 150
OUTPUT SETTLING TIME TO 0.1%
Time (ns)
Output Error (%)
25
30
40
45
35
10
5
15
20
50
0
0.2
0.1
0
0.1
0.2
0.3
0.4
V
O
= 2Vp-p
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
Frequency (MHz)
Output V
oltage (Vp-p)
10
100
1
6
5
4
3
2
1
0
V
S
= 5.5V
V
S
= 2.7V
Maximum Output
Voltage without
Slew-Rate
Induced Distortion
CLOSED-LOOP OUTPUT IMPEDANCE vs FREQUENCY
Frequency (Hz)
Output Impedance (
)
10M
100M
1M
1G
10k
100k
100
10
1
0.1
0.01
0.001
OPA355
604
604
Z
O
OPA355, 2355, 3355
SBOS195D
10
www.ti.com
APPLICATIONS INFORMATION
The OPA355 series is a CMOS, high-speed, voltage-feed-
back, operational amplifier designed for video and other
general-purpose applications. It is available as a single, dual,
or triple op amp.
The amplifier features a 200MHz gain bandwidth and
360V/
s slew rate, but it is unity-gain stable and can be
operated as a +1V/V voltage follower.
Its input common-mode voltage range includes ground, al-
lowing the OPA355 to be used in virtually any single-supply
application up to a supply voltage of +5.5V.
PCB LAYOUT
Good high-frequency PC board layout techniques should be
employed for the OPA355. Generous use of ground planes,
short direct signal traces, and a suitable bypass capacitor
located at the V+ pin will assure clean, stable operation.
Large areas of copper also provide a means of dissipating
heat that is generated within the amplifier in normal opera-
tion.
Sockets are definitely not recommended for use with any
high-speed amplifier.
A 10nF ceramic bypass capacitor is the minimum recom-
mended value; adding a 1
F or larger tantalum capacitor in
TYPICAL CHARACTERISTICS
(Cont.)
At T
A
= +25
C, V
S
= 5V, G = +2, R
F
= 604
, and R
L
= 150
connected to V
S
/2, unless otherwise noted.
CHANNEL-TO-CHANNEL CROSSTALK
Frequency (Hz)
Crosstalk, Input-Referred (dB)
10M
1M
100M
100k
0
20
40
60
80
100
120
OPA3355
(triple)
OPA2355
(dual)
parallel can be beneficial when driving a low-resistance load.
Providing adequate bypass capacitance is essential to achiev-
ing very low harmonic and intermodulation distortion.
OPERATING VOLTAGE
The OPA355 is specified over a power-supply range of +2.7V
to +5.5V (
1.35V to
2.75V). However, the supply voltage
may range from +2.5V to +5.5V (
1.25V to
2.75V). Supply
voltages higher than 7.5V (absolute maximum) can perma-
nently damage the amplifier.
Parameters that vary significantly over supply voltage or
temperature are shown in the Typical Characteristics section
of this data sheet.
ENABLE FUNCTION
The OPA355 can be enabled by applying a TTL HIGH
voltage level to the Enable pin. Conversely, a TTL LOW
voltage level will disable the amplifier, reducing its supply
current from 8.3mA to only 3.4
A per amplifier. This pin
voltage is referenced to single-supply ground. When using a
split-supply, such as
2.5V, the enable/disable voltage levels
will be referenced to V. Independent Enable pins are
available for each channel, providing maximum design flex-
ibility. For portable battery-operated applications, this feature
can be used to greatly reduce the average current and
thereby extend battery life.
OPA355, 2355, 3355
SBOS195D
11
www.ti.com
The Enable input can be modeled as a CMOS input gate with
a 100k
pull-up resistor to V+. Left open, the Enable pin will
assume a logic HIGH, and the amplifier will be on.
The Enable time is 100ns and the disable time is only 30ns.
This allows the OPA355 to be operated as a "gated" amplifier,
or to have its output multiplexed onto a common output bus.
When disabled, the output assumes a high-impedance state.
OUTPUT DRIVE
The output stage can supply high short-circuit current (typi-
cally over 200mA). Therefore, an on-chip thermal shutdown
circuit is provided to protect the OPA355 from dangerously
high junction temperatures. At 160
C, the protection circuit
will shut down the amplifier. Normal operation will resume
when the junction temperature cools to below 140
C.
NOTE: it is not recommended to run a continuous DC current
in excess of
60mA. Refer to the Typical Characteristics,
Output Voltage Swing vs Output Current.
VIDEO
The OPA355 output stage is capable of driving a standard
back-terminated 75
video cable. By back-terminating a
transmission line, it does not exhibit a capacitive load to its
driver. A properly back-terminated 75
cable does not ap-
pear as capacitance; it presents only a 150
resistive load to
the OPA355 output.
The OPA355 can be used as an amplifier for RGB graphic
signals, which have a voltage of zero at the video black
level, by offsetting and AC-coupling the signal, as shown in
Figure 1.
WIDEBAND VIDEO MULTIPLEXING
One common application for video speed amplifiers which
include an enable pin is to wire multiple amplifier outputs
together, then select which one of several possible video
inputs to source onto a single line. This simple
Wired-OR
Video Multiplexer can be easily implemented using the
OPA357; see Figure 2.
INPUT AND ESD PROTECTION
All OPA355 pins are static protected with internal ESD
protection diodes tied to the supplies; see Figure 3.
These diodes will provide overdrive protection if the current
is externally limited to 10mA by the source or by a resistor.
FIGURE 1. RGB Cable Driver.
1/3
OPA355
604
1
F
10nF
+3V
75
Red
Green
Blue
604
R
2
R
1
Red
(1)
V+
R
2
R
1
Green
(1)
V+
R
2
R
1
Blue
(1)
V+
75
220
F
604
75
75
1/3
OPA355
1/3
OPA355
604
75
604
604
75
+
NOTE: (1) Source video signal offset 300mV above ground
to accommodate op amp swing-to-ground capability.
220
F
220
F
OPA355, 2355, 3355
SBOS195D
12
www.ti.com
FIGURE 3. Internal ESD Protection.
External
Pin
+V
CC
V
CC
Internal
Circuitry
FIGURE 2. Multiplexed Output.
1k
A
OPA355
+2.5V
1
F
10nF
2.5V
49.9
V
OUT
49.9
Signal #1
49.9
1k
+
1
F
10nF
+
1k
HCO4
B
OPA355
+2.5V
1
F
10nF
2.5V
49.9
Signal #2
Select
1k
+
1
F
10nF
+
B
ON
A
ON
MECHANICAL DATA
MTSS001C JANUARY 1995 REVISED FEBRUARY 1999
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PW (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
14 PINS SHOWN
0,65
M
0,10
0,10
0,25
0,50
0,75
0,15 NOM
Gage Plane
28
9,80
9,60
24
7,90
7,70
20
16
6,60
6,40
4040064/F 01/97
0,30
6,60
6,20
8
0,19
4,30
4,50
7
0,15
14
A
1
1,20 MAX
14
5,10
4,90
8
3,10
2,90
A MAX
A MIN
DIM
PINS **
0,05
4,90
5,10
Seating Plane
0
8
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion not to exceed 0,15.
D. Falls within JEDEC MO-153
IMPORTANT NOTICE
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TI warrants performance of its hardware products to the specifications applicable at the time of sale in
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solutions:
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amplifier.ti.com
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www.ti.com/audio
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dataconverter.ti.com
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www.ti.com/broadband
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interface.ti.com
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www.ti.com/digitalcontrol
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www.ti.com/military
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