參數(shù)資料
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)： 23/35頁(yè)
文件大小： 837K
代理商： VCA822IDGS
www.ti.com
MACROMODELS AND APPLICATIONS
SUPPORT
Computer simulation of circuit performance using
SPICE
is
often
useful
performance of analog circuits and systems. This
principle is particularly true for video and RF amplifier
circuits where parasitic capacitance and inductance
can play a major role in circuit performance. A
SPICE
model
for the VCA822 is available through the TI web
page. The applications group is also available for
design assistance. The models available from TI
predict typical small-signal ac performance, transient
steps, dc performance, and noise under a wide
variety of operating conditions. The models include
the noise terms found in the electrical specifications
of the relevant product data sheet.
OPERATING SUGGESTIONS
Operating
the
application requires trade-offs between bandwidth,
input dynamic range and the maximum input voltage,
the maximum gain of operation and gain, output
dynamic range and the maximum input voltage, the
package used, loading, and layout and bypass
recommendations. The
Typical Characteristics
have
been defined to cover as much ground as possible to
describe the VCA822 operation. There are four
sections in the Typical Characteristics:
V
S
= ±5V
DC Parameters
and V
S
= ±5V
DC and
Power-Supply
Parameters
,
operation and the intrinsic limitation of a VCA822
design
V
S
= ±5V, A
VMAX
= +2V/V
Gain of +2V/V
Operation
V
S
= ±5V, A
VMAX
= +10V/V
Gain of +10V/V
Operation
V
S
= ±5V, A
VMAX
= +100V/V
Gain of +100V/V
Operation
3
0
-
3
-
6
-
9
-
24
Frequency (MHz)
G
0
25
50
200
-
12
-
15
-
18
-
21
75
175
150
125
100
V
= 1V
OUT
PP
V = 0.5V
-
V = 0.8V
-
V = 0V
V = +0.5V
V = +0.8V
DESIGN-IN TOOLS
DEMONSTRATION BOARDS
Two printed circuit boards (PCBs) are available to
assist in the initial evaluation of circuit performance
using the VCA822 in its two package options. Both of
these are offered free of charge as unpopulated
PCBs, delivered with a user's guide. The summary
information for these fixtures is shown in
Table 2
.
VCA822
SBOS343A–SEPTEMBER 2007–REVISED OCTOBER 2007
With the components shown, the circuit provides a
linear variation of the low-pass cutoff from 2MHz to
20MHz, using –1V
≤
V
G
≤
+1V. Practical evaluation
shows that this circuit works from 8MHz to 16MHz
with –0.8V < V
G
< +0.8V, as shown in
Figure 87
.
when
analyzing
the
VCA822
optimally
for
a
specific
Figure 87. VCA822 as a Voltage-Control,
Low-Pass Filter
which
include
dc
Table 2. EVM Ordering Information
LITERATURE
REQUEST
NUMBER
BOARD PART
NUMBER
PRODUCT
PACKAGE
VCA822ID
SO-14
DEM-VCA-SO-1B
SBOU050
Where the Typical Characteristics describe the actual
performance that can be achieved by using the
amplifier properly, the following sections describe in
detail the trade-offs needed to achieve this level of
performance.
VCA822IDGS
MSOP-10
DEM-VCA-MSOP-1A
SBOU051
The demonstration fixtures can be requested at the
Texas Instruments web site (
www.ti.com
) through the
VCA822 product folder.
Copyright 2007, Texas Instruments Incorporated
Submit Documentation Feedback
23
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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