參數(shù)資料
型號： 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/視頻可變增益放大器
文件頁數(shù)： 26/35頁
文件大?。?/td> 837K
代理商： VCA822IDGS
www.ti.com
OFFSET ADJ USTMENT
e = A
′
VMAX
2
(R
i ) + e
+ 2
4kTR
′
′
′
S
n
S
2
(11)
R
F
+V
IN
R
G+
R
G
-
-
V
IN
FB
R
G
R
S
e
O
VCA822
*
e
O
i
n
4kTR
S
R
S
*
i
n
4kTR
S
NOTE: R and R are noiseless.
NOISE
+V
IN
R
G+
R
G
-
-
V
IN
FB
R
G
50
W
10k
W
1k
W
50
W
V
IN
VCA822
R
F
0.1 F
m
0.1 F
m
10k
W
4k
W
+5V
-
5V
V
OUT
+5V
-
5V
Input Stage and Multiplexer Core
Offset Compensation Circuit
Output Stage Offset
Compensation Circuit
VCA822
SBOS343A–SEPTEMBER 2007–REVISED OCTOBER 2007
This
Figure 91
.
model
is
formulated
in
Equation
11
and
As a result of the internal architecture used on the
VCA822, the output offset voltage originates from the
output stage and from the input stage and multiplier
core.
Figure 92
shows how to compensate both
sources of the output offset voltage. Use this
procedure to compensate the output offset voltage:
starting with the output stage compensation, set
V
G
= –1V to eliminate all offset contribution of the
input stage and multiplier core. Adjust the output
stage offset compensation potentiometer. Finally, set
V
G
= +1V to the maximum gain and adjust the input
stage
and
multiplier
core
procedure effectively eliminates all offset contribution
at the maximum gain. Because adjusting the gain
modifies the contribution of the input stage and the
multiplier core, some residual output offset voltage
remains.
A more complete model is shown in
Figure 93
. For
additional information on this model and the actual
modeled noise terms, please contact the High-Speed
Product Application Support team at
www.ti.com
.
potentiometer.
This
The VCA822 offers 8.2nV/
√
Hz input-referred voltage
noise density at a gain of +10V/V and 1.8 pA/
√
Hz
input-referred
current
input-referred voltage noise density considers that all
noise terms, except the input current noise but
including the thermal noise of both the feedback
resistor and the gain resistor, are expressed as one
term.
Figure 91. Simple Noise Model
noise
density.
The
Figure 92. Adjusting the Input and Output Voltage Sources
26
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Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s):
VCA822
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VCA822IDGSRG4 功能描述:運算放大器 - 運放 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:運算放大器 - 運放 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:運算放大器 - 運放 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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