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参数资料
| 型号： | PGA207U |
| 元件分类： | 测量放大器 |
| 英文描述： | Micropower single-supply CMOS Instrumentation Amplifier |
| 中文描述： | 微功耗单电源 CMOS 仪表放大器 |
| 文件页数： | 8/10页 |
| 文件大小： | 246K |
| 代理商： | PGA207U |
8
PGA206/207
FIGURE 2. Optional Offset Voltage Trim Circuits.
R
1
adjusts the offset of the input amplifiers. Output stage
offset is adjusted with R
2
. A buffer op amp is required in
the output offset adjustment circuit, as shown, to assure
that the Ref pin is driven by a low source impedance. To
adjust for low offset voltage in all gains, first adjust the
input stage offset in the highest gain. Then adjust the
output stage offset (R
2
) in G = 1. Iterate the adjustments for
lowest offset in all gains.
Offset can also be adjusted under processor control with a
D/A converter as shown in Figure 2. The D/A’s output
voltage can be reduced with a resistor divider for better
adjustment resolution, but an op amp buffer following the
divider is required to provide a low source impedance to
the ref terminal. A different offset value is required for
each amplifier gain.
INPUT BIAS CURRENT RETURN PATH
The FET inputs of the PGA206 and PGA207 provide ex-
tremely high input impedance. Still, a path must be provided
for the bias current of each input. Figure 3 shows provisions
for an input bias current path. Without a bias current return
path, the inputs will float to a potential which exceeds the
linear input voltage range and the input amplifiers will
saturate.
If the differential source resistance is low, a bias current
return path can be connected to only one input (see thermo-
couple example in Figure 3). With higher source impedance,
using two resistors provides a balanced input with possible
advantages of lower input offset voltage due to bias current
and better common-mode rejection.
Many sources or sensors inherently provide a path for input
bias current (e.g. the bridge sensor shown in Figure 3).
These applications do not require additional resistor(s) for
proper operation.
FIGURE 3. Providing an Input Bias Current Path.
47k
47k
10k
Microphone,
Hydrophone
etc.
Thermocouple
Center-tap provides
bias current return.
V
R
Bridge
Bias current return
inherrently provided by source.
PGA
PGA
PGA
PGA
A
1
A
2
A
3
12
11
10
10k
10k
10k
10k
7
PGA206
PGA207
Resistors can be substituted
for REF200. Power supply
rejection will be degraded.
Digitally Selected
Feedback Network
6
V
O2
V+
V
O
OPA131
D/A
V+
R
2
10k
100
100
V–
V
REF
5
14
16
4
V
IN
V
IN
–
+
15
A
1
A
0
Digital
Ground
Optional Input Offset Adjustment
13
V+
1
V
O1
9
8
V–
Over-Voltage
Protection
Over-Voltage
Protection
100μA
1/2 REF200
100μA
1/2 REF200
Offset control with
digital/analog converter
Manual output offset trim circuit.
200k
(100k
to 500k
)
R
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PGA207UA | 功能描述:仪表放大器 High-Speed Prog Gain RoHS:否 制造商:Texas Instruments 通道数量: 输入补偿电压:150 V 可用增益调整: 最大输入电阻:10 kOhms 共模抑制比（最小值）:88 dB 工作电源电压:2.7 V to 36 V 电源电流:200 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:MSOP-8 封装:Bulk |
| PGA207UA | 制造商:Texas Instruments 功能描述:IC SM AMP INSTRUMENT PROG GAIN |
| PGA207UA | 制造商:Texas Instruments 功能描述:AMP INSTRUMENT PROG GAIN SOIC16 |
| PGA207UA/1K | 功能描述:仪表放大器 High-Speed Prog Gain RoHS:否 制造商:Texas Instruments 通道数量: 输入补偿电压:150 V 可用增益调整: 最大输入电阻:10 kOhms 共模抑制比（最小值）:88 dB 工作电源电压:2.7 V to 36 V 电源电流:200 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:MSOP-8 封装:Bulk |
| PGA207UA/1KE4 | 功能描述:仪表放大器 High-Speed Prog Gain RoHS:否 制造商:Texas Instruments 通道数量: 输入补偿电压:150 V 可用增益调整: 最大输入电阻:10 kOhms 共模抑制比（最小值）:88 dB 工作电源电压:2.7 V to 36 V 电源电流:200 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:MSOP-8 封装:Bulk |
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