- 您现在的位置：买卖IC网 > PDF目录300088 > VCA821IDRG4 (TEXAS INSTRUMENTS INC) SPECIALTY ANALOG CIRCUIT, PDSO14 PDF资料下载
参数资料
| 型号： | VCA821IDRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| 封装： | GREEN, PLASTIC, MS-012AB, SOIC-14 |
| 文件页数： | 11/36页 |
| 文件大小： | 1276K |
| 代理商： | VCA821IDRG4 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页当前第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
APPLICATION INFORMATION
WIDEBAND VARIABLE GAIN AMPLIFIER
0.1 F
m
X2Y
Capacitor
(seedetail)
+V
S
-VS
G
1
G
2
A
B
X2Y
CapacitorDetail
SO-14
VCA821
x1
x2
R
200
G
W
R
G+
V
IN
x1
R
G-
-VIN
I
RG
V
G
V
OUT
FB
R
F
1kW
V
REF
+5V
-5V
2.2 F
m
2.2 F
m
+
20W
V
OUT
+V
IN
www.ti.com ....................................................................................................................................... SBOS407B – DECEMBER 2007 – REVISED DECEMBER 2008
For test purposes, the input impedance is set to 50
OPERATION
with a resistor to ground and the output impedance is
set to 50
with a series output resistor. Voltage
The VCA821 provides an exceptional combination of
swings reported in the Electrical Characteristics table
high output power capability with a wideband, greater
are taken directly at the input and output pins, while
than 40dB gain adjust range, linear in dB variable
output power (dBm) is at the matched 50
load. For
gain amplifier. The VCA821 input stage places the
the circuit in Figure 74, the total effective load is
transconductance element between two input buffers,
100
1k
. Note that for the SO-14 package, there
using the output currents as the forward signal. As
is a voltage reference pin, VREF (pin 9). For the
the differential input voltage rises, a signal current is
SO-14 package, this pin must be connected to
generated through the gain element. This current is
ground through a 20
resistor in order to avoid
then mirrored and gained by a factor of two before
possible oscillations of the output stage. In the
reaching the multiplier. The other input of the
MSOP-10 package, this pin is internally connected
multiplier
is
the
voltage
gain
control
pin,
VG.
and does not require such precaution. An X2Y
Depending on the voltage present on VG, up to two
capacitor has been used for power-supply bypassing.
times
the
gain
current
is
provided
to
the
The combination of low inductance, high resonance
transimpedance output stage. The transimpedance
frequency, and integration of three capacitors in one
output stage is a current-feedback amplifier providing
package (two capacitors to ground and one across
high output current capability and high slew rate,
the supplies) enables the VCA821 to achieve the low
2500V/
s. This exceptional full-power performance
second-harmonic distortion reported in the Electrical
comes at the price of relatively high quiescent current
Characteristics table. More information on how the
(34mA), but low input voltage noise for this type of
VCA821 operates can be found in the Operating
architecture (6nV/
√Hz).
Suggestions section.
Figure 74 shows the dc-coupled, gain of +10V/V, dual
power-supply circuit used as the basis of the ±5V
Figure 74. DC-Coupled, AVMAX = 20dB, Bipolar Supply Specification and Test Circuit
Copyright 2007–2008, Texas Instruments Incorporated
19
Product Folder Link(s): VCA821
相关PDF资料 |
PDF描述 |
|---|---|
| VCO-103 | VCO, 50 MHz - 100 MHz |
| VCO-108 | VCO, 800 MHz - 1600 MHz |
| VCO-117TC | VCO, 300 MHz - 600 MHz |
| VCO-219TC | VCO, 3000 MHz - 4800 MHz |
| VCO-305 | VCO, 200 MHz - 400 MHz |
相关代理商/技术参数 |
参数描述 |
|---|---|
| VCA822 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Wideband, > 40dB Gain Adjust Range, Linear in V/V VARIABLE GAIN AMPLIFIER |
| VCA822ID | 功能描述:运算放大器 - 运放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| VCA822ID | 制造商:Texas Instruments 功能描述:Variable Gain Amplifier |
| VCA822IDG4 | 功能描述:运算放大器 - 运放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| VCA822IDGS | 制造商:TI 制造商全称:Texas Instruments 功能描述:Wideband, > 40dB Gain Adjust Range, Linear in V/V VARIABLE GAIN AMPLIFIER |
发布紧急采购，3分钟左右您将得到回复。