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PDF VCA610 Data sheet ( Hoja de datos )

Número de pieza VCA610
Descripción WIDEBAND VOLTAGE CONTROLLED AMPLIFIER
Fabricantes Burr-Brown Corporation 
Logotipo Burr-Brown Corporation Logotipo



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® VCA610
VCA610
VCA610
WIDEBAND
VOLTAGE CONTROLLED AMPLIFIER
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/µs
q EASY TO USE
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 RS
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/µs, gain control signal is a
unipolar (0 to –2V) voltage that varies the gain lin-
early in dB/V.
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
6 72
–In
+In
VC
Gain
Control
8
1
3
VCA610
5
VOUT
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
©1992 Burr-Brown Corporation
PDS-1140D
Printed in U.S.A. January, 1995

1 page




VCA610 pdf
TYPICAL PERFORMANCE CURVES (CONT)
At VS = ±5V, RL = 500, RS = 0, and TA = +25°C, unless otherwise noted.
GROUP DELAY vs GAIN
16
2-TONE, 3rd ORDER INTERMODULATION
INTERCEPT vs GAIN
20
14
1MHz
12
10MHz
10
8 15MHz
10
0
–10
1MHz
–20
–30
10MHz
6
–40
–20 0
20
Gain (dB)
40
–40
–40
–20 0
Gain (dB)
20
40
OUTPUT OFFSET CHANGE vs GAIN
150 Change from Output Offset at G = –40dB
Low Grade
100 High Grade
50
Specification
0 Limit
–50
–100
–150
–40
–20 0
Gain (dB)
20
40
PSR and CMR vs FREQUENCY
60
50
–PSR
40
30
20
10 G = 0dB
CMR
+PSR
0
10k
100k
1M
Frequency (Hz)
10M
100M
+500
0
–500
0
LARGE SIGNAL RESPONSE
G = +40dB
f = 5MHz
RL = 500
100
Time (µs)
200
+500
“DIAMOND PATTERN” RESPONSE
0
–500
0
25
Time (µs)
50
®
5 VCA610

5 Page





VCA610 arduino
VR
–10mV
VIN
VCA610
VC
VO = –VR10 –2 [R1 VIN /(R1 + R2) + 1]
R2
330
R1
470
FIGURE 10. Signal Drive of the VCA610 Gain Control Pin
Produces and Exponential Response, Re-ex-
panding Signal Companded by Figure 9.
VOLTAGE-CONTROLLED LOW-PASS FILTER
In the circuit of Figure 11, the VCA610 serves as the
variable gain element of a voltage-controlled low-pass filter.
As will be described, this implementation expands the circuit’s
voltage swing capability over that normally achieved with
the equivalent multiplier implementation. The circuit’s re-
sponse pole responds to control voltage VC according to the
relationship fP = G/2πR2C where G = 10–2 (VC + 1). With the
components shown, the circuit provides a linear variation of
the low-pass cutoff from 300Hz to 1MHz.
R2
R1
VI
330
C 330
0.047µF
OPA620
VOA
VCA610
VO
VC
VO
VI
=–
R2 1
R1 1 + R2Cs/G
fP = G/2πR2C G = 10 –2(VC + 1)
FIGURE 11. This Voltage-Tuneable Low-Pass Filter Pro-
duces a Variable Cutoff Frequency with a
3,000:1 Range.
The response control results from amplification of the feed-
back voltage applied to R2. Consider first the case where the
VCA610 produces G = 1. Then, the circuit performs as if
this amplifier were replaced by a short circuit. Visually
doing so leaves a simple voltage amplifier with a feedback
resistor bypassed by a capacitor. This basic circuit produces
a response pole at fP = 1/2πR2C.
For G > 1, the circuit applies a greater voltage to R2,
increasing the feedback current this resistor supplies to the
summing junction of the OPA620. The increased feedback
current produces the same result as if R2 had been decreased
in value in the basic circuit described above. Decreasing the
effective R2 resistance moves the circuit’s pole to a higher
frequency, producing the fP = G/2πR2C response control.
Finite loop gain and a signal swing limitation set perfor-
mance boundaries for the circuit. Both limitations occur
when the VCA610 attenuates rather than amplifies the
feedback signal. These two limitations reduce the circuit’s
utility at the lower extreme of the VCA610’s gain range. For
–1 VC 0, this amplifier produces attenuating gains in the
range from 0dB to –40dB. This directly reduces the net gain
in the circuit’s feedback loop, increasing gain error effects.
Also, this attenuation transfers an output swing limitation
from the OPA620 output to the overall circuit’s output. Note
that OPA620 output voltage, VOA, relates to VO through the
expression VO = GVOA. Thus, a G < 1 limits the maximum
VO swing to a value less than the maximum VOA swing.
However, the circuit shown provides greater output swing
than the more common multiplier implementation. The latter
replaces the VCA610 of the figure with an analog multiplier
having a response of VO = XY/10. Then, X = VOA and Y =
VC, making the circuit output voltage VO = VOAVC/10. Thus,
the multiplier implementation amplifies VOA by a gain of VC/
10. Circuit constraints require that VC 10, making this gain
1. Thus, the multiplier performs only as a variable attenu-
ator and never provides amplification. As a result, the
voltage swing limitation of VOA restricts the VO swing
throughout most of the circuit’s control range. Replacing the
multiplier with the VCA610 shown permits equivalent gains
greater > 1. Then, operating the VCA610 with gains in the
range of one to 100 avoids the reduction in output swing
capability.
VOLTAGE-CONTROLLED HIGH-PASS FILTER
A circuit analogous to the above low-pass filter produces a
voltage-controlled high-pass response. The gain control pro-
vided by the VCA610 of Figure 12 varies this circuit’s
response zero from 1Hz to 10kHz according to the relation-
ship FZ 1/2πGR1C where G = 10 –2 (VC + 1).
R1 R2
VI
33k
33k
VCA610
C
VOA
0.047µF
R3
33
OPA620
VO
VC
For R3 << GR1 and f << 1/2πR3Cs,
VO
VI
=
R2
R1
(1 + GR1Cs), fZ = 1/2πGR1C
where G = 10–2(VC + 1)
FIGURE 12. A Voltage-Tunable High-Pass Filter Pro-
duces a Response Zero Variable from 1Hz to
10kHz.
®
11 VCA610

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