The AD8421ARMZ-R7 from Analog Devices is a low-power instrumentation amplifier with 3MHz bandwidth, 200uA supply current, and single-resistor gain in MSOP-8 for portable instrumentation.
| 包装 | MSOP-8 (3x3mm) |
The AD8421ARMZ-R7 from Analog Devices is a low-power instrumentation amplifier with 3MHz bandwidth, 200uA supply current, and single-resistor gain in MSOP-8 for portable instrumentation.
The AD8421ARMZ-R7 is a low-power instrumentation amplifier from Analog Devices in MSOP-8, operating from 2.7V to 36V with only 200uA supply current. The gain is set by a single external resistor between the RG1 and RG2 pins: G = 1 + (9.9kOhm / Rg). With no external resistor (RG1 and RG2 open), the gain is G=1. For G=100, Rg = 100 Ohms; for G=1000, Rg = 9.9 Ohms. The three-op-amp instrumentation amplifier architecture provides high input impedance (1GOhm differential), high common-mode rejection (80dB at G=1, 94dB at G=10), and low input offset voltage (50uV typical). The 3MHz bandwidth at G=1 rolls off to approximately 30kHz at G=100. The input voltage noise is 8nV/sqrt(Hz) at 1kHz at G=1, decreasing to 3.2nV/sqrt(Hz) at G=100 (referred to input). The REF pin shifts the output baseline: VOUT = G x (VIN+ – VIN-) + VREF. This is useful for single-supply operation where the REF pin can be set to VCC/2 to allow bipolar input signals to produce unipolar outputs. The input common-mode range extends from (V-)+1.6V to (V+)-1.1V at G=1. The output can swing to within 50mV of the rails. The device is ideal for bridge sensor signal conditioning (load cells, strain gauges, pressure sensors) where the differential signal is small and common-mode voltage is large.
| 针脚 | 名称 | 类型 | 功能 |
|---|---|---|---|
| 1 | RG1 | 模拟 | Gain resistor terminal 1 (connect Rg between RG1 and RG2) |
| 2 | IN- | 输入 | Inverting signal input (differential) |
| 3 | IN+ | 输入 | Non-inverting signal input (differential) |
| 4 | V- | 电源 | Negative supply (connect to GND for single-supply) |
| 5 | REF | 输入 | Reference input (sets output offset, typically grounded) |
| 6 | V+ | 电源 | Positive supply (2.7-36V) |
| 7 | 出局 | 输出 | Amplifier output (Vout = G x (IN+ – IN-) + VREF) |
| 8 | RG2 | 模拟 | Gain resistor terminal 2 (connect Rg between RG1 and RG2) |
| 制造商 | 部件编号 | 包装 | 说明 |
|---|---|---|---|
| 模拟器件公司 | AD8422ARMZ-R7 | MSOP-8 | Improved version, lower noise, wider BW |
| 德州仪器 | INA821AIDR | SOIC-8 | Low-power IA, 2.7-36V, G=1-10000 |
| 模拟器件公司 | AD620ARZ | SOIC-8 | Classic IA, G=1-10000, 1MHz at G=1 |
| 德州仪器 | INA333AIDGKR | VSSOP-8 | Zero-drift IA, 1.8-5.5V, low power |
| 马克西姆 | MAX4194ESA+T | SOIC-8 | IA, G=1-1000, 2.7-7.5V, RR output |
品牌:
封装:
货运周期：3~7 天
最低订购量为 1
品牌:
封装:
货运周期：3~7 天
最低订购量为 1
品牌:
封装:
货运周期：3~7 天
最低订购量为 1
品牌:
封装:
货运周期：3~7 天
最低订购量为 1
品牌:
封装:
货运周期：3~7 天
最低订购量为 1
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