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参数资料
| 型号： | THS7002IPWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封装： | GREEN, PLASTIC, HTSSOP-28 |
| 文件页数： | 13/41页 |
| 文件大小： | 1203K |
| 代理商： | THS7002IPWP |
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THS7001, THS7002
70MHz PROGRAMMABLEGAIN AMPLIFIERS
SLOS214C OCTOBER 1998 REVISED MARCH 2007
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
PGA gain control (continued)
One aspect of the THS7001 and THS7002 PGA signal inputs is that there are internal variable resistors (RF
and RG), which set the gain. The resistance of RG changes from about 270- (Gain = +20 dB) to about 3-k
(Gain = 22 dB). Therefore, any source impedance at the input to the PGA amplifiers will cause a gain error
to be seen at the output. A buffer/amplifier is highly recommended to directly drive the input of the PGA section
to help minimize this effect.
Another thing which should be kept in mind is that when each amplifier’s VREF is connected to ground, the
internal RG resistor is connected to a virtual ground. Therefore, if a termination resistor is used on the source
side, the total terminating resistance is the parallel combination of the terminating resistance and the internal
RG resistor. This, in conjunction with the series impedance problem mentioned previously, can potentially cause
a voltage mismatch between the output of a 50-
source and the expected PGA output voltage. These points
can be easily seen in the simplified diagram of the THS7001 and THS7002 PGA section (see Figure 56).
+
PGA
VOUT
No Source Impedance
VIN
RG
RF
PGA
G0 G1 G2
PGA
VIN
Negative
Clamp VL
Positive
Clamp VH
THS7001 and THS7002 IC
PGA
VREF
RTERMINATION
RSOURCE
R
TOTAL TERMINATION +
R
TERMINATION
R
SOURCE )
R
G
R
TERMINATION )
R
SOURCE )
R
G
Figure 56. Simplified PGA Section of the THS7001 and THS7002
voltage reference terminal
If a voltage is applied to the PGA’s VREF terminal, then the output of the PGA section will amplify the applied
reference voltage by one plus the selected gain. Thus, the output gain strictly due to VREF will be from +0.6 dB
to +21 dB according to the following formula:
V
OUT
V
REF
+ 20 X Log
10 1 ) PGA Gain V V
For most configurations, it is recommended that this pin be connected to the signal ground.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS7002IPWPG4 | 功能描述:特殊用途放大器 70-MHz Hi-Spd Dual Prgrmbl-Gain Amp RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| THS7002IPWPR | 功能描述:运算放大器 - 运放 70-MHz Programmable- Gain Dual 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 |
| THS7002PWP | 制造商:TI 制造商全称:Texas Instruments 功能描述:70-MHz PROGRAMMABLE-GAIN AMPLIFIERS |
| THS7102 | 制造商:TI 制造商全称:Texas Instruments 功能描述:ADSL (POTS) CENTRAL OFFICE LINE INTERFACE DRIVER/RECEIVER |
| THS7103 | 制造商:TI 制造商全称:Texas Instruments 功能描述:ADSL (ISDN) CENTRAL OFFICE LINE INTERFACE DRIVER/RECEIVER |
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