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VCA820IDR Datasheet(PDF) 1 Page - Texas Instruments

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Part # VCA820IDR
Description  Wideband, 40dB Adjust Range, Linear in dB VARIABLE GAIN AMPLIFIER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

VCA820IDR Datasheet(HTML) 1 Page - Texas Instruments

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VCA820
VCA820
R
F
+V
IN
R
G+
R
G-
-VIN
FB
R
G
R
S
R
S
20W
V
IN+
V
IN-
VCA820
95
90
40
Frequency(Hz)
100k
100M
85
45
75
80
10M
1M
50
55
60
65
70
Input-Referred
VCA820
www.ti.com............................................................................................................................................ SBOS395C – OCTOBER 2007 – REVISED OCTOBER 2009
Wideband, > 40dB Adjust Range, Linear in dB
VARIABLE GAIN AMPLIFIER
Check for Samples: VCA820
1
FEATURES
DESCRIPTION
23
150MHz SMALL-SIGNAL BANDWIDTH
The VCA820 is a dc-coupled, wideband, linear in dB,
137MHz, 5VPP BANDWIDTH (G = +10V/V)
continuously
variable,
voltage-controlled
gain
0.1dB GAIN FLATNESS to 28MHz
amplifier.
It
provides
a
differential
input
to
1700V/
μs SLEW RATE
single-ended conversion with a high-impedance gain
control input used to vary the gain down 40dB from
> 40dB GAIN ADJUST RANGE
the nominal maximum gain set by the gain resistor
HIGH GAIN ACCURACY: 20dB ±0.4dB
(RG) and feedback resistor (RF).
HIGH OUTPUT CURRENT: 160mA
The VCA820 internal architecture consists of two
input buffers and an output current feedback amplifier
APPLICATIONS
stage integrated with a multiplier core to provide a
AGC RECEIVERS with RSSI
complete variable gain amplifier (VGA) system that
DIFFERENTIAL LINE RECEIVERS
does not require external buffering. The maximum
gain is set externally with two resistors, providing
PULSE AMPLITUDE COMPENSATION
flexibility in designs. The maximum gain is intended
VARIABLE ATTENUATORS
to be set between +2V/V and +100V/V. Operating
DROP-IN UPGRADE TO LMH6502
from ±5V supplies, the gain control voltage for the
VCA820 adjusts the gain linearly in dB as the control
voltage varies from 0V to +2V. For example, set for a
maximum gain of +10V/V, the VCA820 provides
20dB, at +2V input, to –20dB at 0V input of gain
control range. The VCA820 offers excellent gain
linearity.
For
a
20dB
maximum
gain,
and
a
gain-control input voltage varying between 1V and
2V, the gain does not deviate by more than ±0.4dB
(maximum at +25°C).
Figure 1. Differential Equalizer
VCA820 RELATED PRODUCTS
GAIN
ADJUST
INPUT
SIGNAL
RANGE
NOISE
BANDWIDTH
SINGLES
DUALS
(dB)
(nV/
√Hz)
(MHz)
VCA810
80
2.4
35
VCA2612
45
1.25
80
VCA2613
45
1
80
VCA2615
52
0.8
50
VCA2617
48
4.1
50
VCA820
40
8.2
150
VCA821
40
7.0
420
VCA822
40
8.2
150
VCA824
40
7.0
420
Figure 2. Common-Mode Rejection Ratio
1
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.
2
X2Y is a trademark of X2Y Corporation.
3
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2007–2009, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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