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| 型號(hào)： | VCA822IDGS |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Wideband, > 40dB Gain Adjust Range, Linear in V/V VARIABLE GAIN AMPLIFIER |
| 中文描述： | 寬帶，“40dB的增益調(diào)整范圍在V，線性音頻/視頻可變?cè)鲆娣糯笃?/td> |
| 文件頁(yè)數(shù)： | 19/35頁(yè) |
| 文件大小： | 837K |
| 代理商： | VCA822IDGS |
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APPLICATION INFORMATION
WIDEBAND VARIABLE GAIN AMPLIFIER
OPERATION
The VCA822 provides an exceptional combination of
high output power capability with a wideband, greater
than 40dB gain adjust range, linear in V/V variable
gain amplifier. The VCA822 input stage places the
transconductance element between two input buffers,
using the output currents as the forward signal. As
the differential input voltage rises, a signal current is
generated through the gain element. This current is
then mirrored and gained by a factor of two before
reaching the multiplier. The other input of the
multiplier
is
the
voltage
Depending on the voltage present on V
G
, up to two
times
the
gain
current
transimpedance output stage. The transimpedance
output stage is a current-feedback amplifier providing
high output current capability and high slew rate,
1700V/
μ
s. This exceptional full-power performance
comes at the price of a relatively high quiescent
current (36mA), but a low input voltage noise for this
type of architecture (8.2nV/
√
Hz).
VCA822
x1
x2
R
200
G
W
R
G+
V
IN
x1
R
G
-
-
V
IN
I
RG
V
G
V
OUT
FB
R
F
1k
W
V
REF
+5V
-
5V
0.1 F
m
X2Y
Capacitor
a
2.2 F
m
2.2 F
m
+
+
20
W
20
W
20
W
V
OUT
+V
IN
VCA822
SBOS343A–SEPTEMBER 2007–REVISED OCTOBER 2007
For test purposes, the input impedance is set to 50
with a resistor to ground and the output impedance is
set to 50
with a series output resistor. Voltage
swings reported in the
Electrical Characteristics
table
are taken directly at the input and output pins, while
output power (dBm) is at the matched 50
load. For
the circuit in
Figure 77
, the total effective load is
100
1k
. Note that for the SO-14 package, there
is a ground pin, GND (pin 11). For the SO-14
package, this pin must be connected to ground
through a 20
resistor in order to avoid possible
oscillations of the output stage. In the MSOP-10
package, this pin is internally connected and does not
require such precaution. An X2Y capacitor has
been
used
for
power-supply
combination
of
low
inductance,
frequency, and integration of three capacitors in one
package (two capacitors to ground and one across
the supplies) of this capacitor enables to achieve the
low
second-harmonic
distortion
Electrical Characteristics
table. More information on
how the VCA822 operates can be found in the
Operating Suggestions
section.
gain
control
pin,
V
G
.
bypassing.
high
The
resonance
is
provided
to
the
reported
in
the
Figure 77
shows the dc-coupled, gain of +10V/V, dual
power-supply circuit used as the basis of the ±5V
Electrical Characteristics
and
Typical Characteristics
.
Figure 77. DC-Coupled, A
VMAX
= +10V/V, Bipolar Supply Specification and Test Circuit
Copyright 2007, Texas Instruments Incorporated
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Product Folder Link(s):
VCA822
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VCA822IDGSR | 功能描述:運(yùn)算放大器 - 運(yùn)放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| VCA822IDGSRG4 | 功能描述:運(yùn)算放大器 - 運(yùn)放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| VCA822IDGST | 功能描述:運(yùn)算放大器 - 運(yùn)放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| VCA822IDGSTG4 | 功能描述:運(yùn)算放大器 - 運(yùn)放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| VCA822IDR | 功能描述:運(yùn)算放大器 - 運(yùn)放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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