1992 Burr-Brown Corporation
PDS-1140D
Printed in U.S.A. January, 1995
DESCRIPTION
The VCA610 is a wideband, continuously variable,
voltage controlled gain amplifier. It provides linear-
dB gain control with high impedance inputs. It is
designed to be used as a flexible gain control element
in a variety of electronic systems.
The VCA610 has a gain control range of 80dB (40dB
to +40dB) providing both gain and attenuation for
maximum flexibility in a small 8-lead SO-8 or plastic
dual-in-line package. The broad attenuation range can
be used for gradual or controlled channel turn-on and
turn-off for applications in which abrupt gain changes
can create artifacts or other errors. In addition, the
output can be disabled to provide 80dB of attenua-
tion. Group delay variation with gain is typically less
than
2ns across a bandwidth of 1 to 15MHz.
The VCA610 has a noise figure of 3.5dB (with an R
S
of 200
) including the effects of both current and
voltage noise. Instantaneous output dynamic range is
70dB for gains of 0dB to +40dB with 1MHz noise
bandwidth. The output is capable of driving 100
.
The high speed, 300dB/
s, gain control signal is a
unipolar (0 to 2V) voltage that varies the gain lin-
early in dB/V.
VCA610
FEATURES
q
WIDE GAIN CONTROL RANGE: 80dB
q
SMALL PACKAGE: 8-pin SOIC or DIP
q
WIDE BANDWIDTH: 30MHz
q
LOW VOLTAGE NOISE: 2.2nV/
Hz
q
FAST GAIN SLEW RATE: 300dB/
s
q
EASY TO USE
WIDEBAND
VOLTAGE CONTROLLED AMPLIFIER
APPLICATIONS
q
OPTICAL DISTANCE MEASUREMENT
q
AGC AMPLIFIER
q
ULTRASOUND
q
SONAR
q
ACTIVE FILTERS
q
LOG AMPLIFIER
q
IF CIRCUITS
q
CCD CAMERAS
The VCA610 is designed with a very fast overload
recovery time of only 200ns. This allows a large
signal transient to overload the output at high gain,
without obscuring low-level signals following closely
behind. The excellent overload recovery time and
distortion specifications optimize this device for low-
level doppler measurements.
+5V 5V
V
OUT
In
+In
V
C
Gain
Control
VCA610
6
8
5
1
3
7
2
International Airport Industrial Park Mailing Address: PO Box 11400, Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 Tel: (520) 746-1111 Twx: 910-952-1111
Internet: http://www.burr-brown.com/ FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
VCA610
VCA610
VCA610
2
SPECIFICATIONS
ELECTRICAL
All specifications at V
S
=
5V, R
L
= 500
, R
S
= 0
, and T
A
= +25
C, unless otherwise noted.
VCA610PA, UA
VCA610P, U
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
NOTES: (1) See Input/Output Range discussion in Applications Information Section (Figure 2). (2) Gain is laser trimmed and tested at gains of 40dB, 0dB, +15dB,
+25dB, and +40dB; V
IN
=1Vp-p for gains less than 0dB; V
OUT
= 1V for gains of 0dB to +40dB. (3) Output offset change from offset at G = 40dB.
(4) Gain = +40dB; Input step of 2V to 2mV; time required for output to return from saturation to linear operation. (5) V
IN
= 7mVp-p, V
OUT
= 700mVp-p (250mVrms);
Output Power = 10dBm/tone, equal amplitude tones of 5MHz
500Hz, G = +40dB. See typical performance curves. (6) With R
S
= 0
, and noise bandwidth of
1MHz. IDR = 20 log (V
ORMS
/(e
ORMS
x
BW)); where V
ORMS
is rms output voltage, e
ORMS
is output noise spectral density, and BW is noise bandwidth.
Symmetrical to Ground (
10%)
INPUT NOISE
Input Voltage Noise
G = +40dB, R
S
= 0
2.2
*
nV/
Hz
Input Current Noise
G = 40dB to +40dB
1.4
*
pA/
Hz
Noise Figure
G = +40dB, R
S
= 200
3.5
*
dB
INPUT
Input Impedance
Common-Mode
1 || 1
*
M
|| pF
Bias Current
All Gains
6
*
A
Offset Current
All Gains
2
*
A
Differential Voltage Range
(1)
*
Common-Mode Voltage Range
2.5
*
V
Common-Mode Rejection
50
*
dB
GAIN
Specified Gain Range
40
+40
*
*
dB
Gain Accuracy
(2)
40dB
G
+40dB
0.5
2
2
4
dB
Gain Accuracy Temperature Drift
T
A
= 25
C to +85
C
0.01
*
dB/
C
Gain with Output Disabled
+0.1V
V
C
+2.0V, f = 1MHz
80
*
dB
GAIN CONTROL
Gain Scaling Factor
40dB
G
+40dB
40
*
dB/V
Control Voltage (V
C
)
G = 40dB (V
C
= 0V) to +40dB (V
C
= 2V)
0
2
*
*
V
Bandwidth
3dB
1
*
MHz
Slew Rate
80dB Gain Step
300
*
dB/
s
Settling Time: 1%
V
IN
= 10mVDC,
G = 80dB
800
*
ns
Input Impedance
1 || 1
*
M
|| pF
Input Bias Current
All Gains
2
*
A
Output Offset Change
(3)
G = 80dB
30
75
*
125
mV
FREQUENCY RESPONSE
Bandwidth, Small-Signal
3dB, All Gains
30
*
MHz
Bandwidth, Large-Signal
V
O
= 1Vp-p, G
0dB
25
*
MHz
Group Delay Unit-to-Unit Variation
0dB
G
+40dB
f = 1 to 15MHz
1
*
ns
40dB
G < 0dB
f = 1 to 15MHz
2
*
ns
Output Slew Rate
V
O
= 1Vp-p
60
*
V/
s
Overload Recovery
(4)
200
*
ns
Two-tone Intermodulation Distortion
(5)
Small-Signal
50
*
dBc
Two-tone, 3rd Order IMD Intercept
(5)
Small-Signal
15
*
dBm
OUTPUT
Voltage Swing
(1)
G = +40dB
1
1.6
*
*
V
G = 0dB
0.5
0.75
*
*
V
Output Voltage Limit
*
Short-Circuit Current
Continuous to Common
80
*
mA
Instantaneous Dynamic Range (IDR)
(6)
G = 0dB to +40dB
V
O
= 1.5Vp-p
70
*
dB
Offset
G = 40dB
2
30
*
*
mV
Output Resistance
f = 1MHz, All Gains
10
*
POWER SUPPLY
Specification
5V Recommended
4.5
5.5
*
*
V
PSR
G = 0dB
40
50
*
dB
Quiescent Current
26/+30
32
*
*
mA
TEMPERATURE
Specification
Applies to Temperature Drift Specs
25
+85
*
*
C
Operation
40
+125
*
*
C
Thermal Resistance,
JA
P, PA
100
*
C/W
U, UA
125
*
C/W
VCA610
3
PIN CONFIGURATION
Top View
DIP
SO-8
V
S
7
+V
S
6
In
8
V
OUT
5
VCA610
2
GND
3
1
+In
4
Gain
Control,
V
C
No
Internal
Connection
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
ABSOLUTE MAXIMUM RATINGS
Supply .................................................................................................
7V
Differential Input Voltage ............................................................... Total V
S
Input Voltage Range ..................................... See Input Protection Section
Storage Temperature Range .......................................... 65
C to +150
C
Lead Temperature (soldering, DIP, 10s) ........................................ +300
C
Lead Temperature (soldering, SO-8, 3s) ....................................... +260
C
Output Short-Circuit to Ground (+25
C) ................................... Continuous
Junction Temperature (T
J
) ............................................................. +175
C
PACKAGE/ORDERING INFORMATION
PACKAGE DRAWING
PRODUCT
PACKAGE
NUMBER
(1)
VCA610PA
8-Pin Plastic DIP
006
VCA610P
8-Pin Plastic DIP
006
VCA610UA
SO-8 Surface-Mount
182
VCA610U
SO-8 Surface-Mount
182
NOTE:(1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
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.
VCA610
4
NOISE FIGURE vs SOURCE RESISTANCE
Source Resistance (
)
NF (dB)
25
20
15
10
5
0
10
100
1k
10k
100k
NF
dB
= 10 log 1 +
e
n
2
+ (i
n
R
S
)
2
4kTR
S
VOLTAGE AND CURRENT NOISE
vs GAIN
Gain (dB)
10k
1k
100
10
1
40
20
0
+20
+40
Voltage Noise (nV/
Hz)
1k
100
10
1
0.1
Current Noise (pA/
Hz)
Output Voltage Noise
Input Current Noise
Input-Referred Voltage Noise
GAIN CONTROL RESPONSE
Frequency (Hz)
Normalized Response (dB)
3
0
3
6
9
12
15
10k
100k
1M
10M
100M
GAIN vs CONTROL VOLTAGE
Control Voltage, V
C
(V)
Gain (dB)
60
40
20
0
20
40
60
80
0.5
0
0.5
1
1.5
2
2.5
Output Disabled for
+0.1V
V
C
+2V
Specified Operating Range
SMALL-SIGNAL RESPONSE vs GAIN
Frequency (MHz)
0.1
1.0
10
100
Gain (dB)
50
40
30
20
10
0
10
20
30
40
50
V
C
= 2.0V
V
C
= 1.5V
V
C
= 1.0V
V
C
= 0.5V
V
C
= 0V
Large Signal, V
O
= 1Vp-p
TYPICAL PERFORMANCE CURVES
At V
S
=
5V, R
L
= 500
, R
S
= 0
, and T
A
= +25
C, unless otherwise noted.
FEEDTHRU WITH OUTPUT DISABLED
Frequency (MHz)
Disabled Gain (dB)
0
20
40
60
80
100
0.1
1
10
100
Output Disabled for
+0.1V
V
C
+2V
VCA610
5
PSR and CMR vs FREQUENCY
Frequency (Hz)
Rejection (dB)
60
50
40
30
20
10
0
10k
100k
1M
10M
100M
PSR
+PSR
CMR
G = 0dB
OUTPUT OFFSET CHANGE vs GAIN
Gain (dB)
Output Offset Change (mV)
150
100
50
0
50
100
150
40
20
0
20
40
Change from Output Offset at G = 40dB
Specification
Limit
Low Grade
High Grade
2-TONE, 3rd ORDER INTERMODULATION
INTERCEPT vs GAIN
Gain (dB)
Intercept Point (dBm)
20
10
0
10
20
30
40
40
20
0
20
40
10MHz
1MHz
GROUP DELAY vs GAIN
Gain (dB)
Group Delay (ns)
16
14
12
10
8
6
40
20
0
20
40
1MHz
10MHz
15MHz
0
25
50
"DIAMOND PATTERN" RESPONSE
Time (s)
0
100
200
LARGE SIGNAL RESPONSE
Time (s)
TYPICAL PERFORMANCE CURVES
(CONT)
Output Voltage (mV)
Output Voltage (mV)
G = +40dB
f = 5MHz
R
L
= 500
+500
0
500
0
At V
S
=
5V, R
L
= 500
, R
S
= 0
, and T
A
= +25
C, unless otherwise noted.
500
+500
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