The AD8422 is a high precision, low power, low noise, rail-to-rail instrumentation amplifier that delivers the best performance per unit microampere in the industry. The AD8422 processes signals with ultralow distortion performance that is load independent over its full output range.
The AD8422 is the third generation development of the industry standard AD620. The AD8422 employs new process technologies and design techniques to achieve higher dynamic range and lower errors than its predecessors, while consuming less than one-third of the power. The AD8422 uses the high performance pinout introduced by the AD8221.
Very low bias current makes the AD8422 error-free with high source impedance, allowing multiple sensors to be multiplexed to the inputs. Low voltage noise and low current noise make the AD8422 an ideal choice for measuring a Wheatstone bridge.
The wide input range and rail-to-rail output of the AD8422 bring all of the benefits of a high performance in-amp to singlesupply applications. Whether using high or low supply voltages, the power savings make the AD8422 an excellent choice for high channel count or power sensitive applications on a very tight error budget.
The AD8422 uses robust input protection that ensures reliability without sacrificing noise performance. The AD8422 has high ESD immunity, and the inputs are protected from continuous voltages up to 40 V from the opposite supply rail.
A single resistor sets the gain from 1 to 1000. The reference pin can be used to apply a precise offset to the output voltage. The AD8422 is specified from −40°C to +85°C and has typical performance curves to 125°C. It is available in 8-lead MSOP and 8-lead SOIC packages.
Features and Benefits330 μA maximum quiescent current Rail-to-rail output 8 nV/√Hz maximum input voltage noise at 1 kHz 0.15 μV p-p RTI noise (G = 100) 0.5 ppm nonlinearity with 2 kΩ load (G = 1) 80 dB minimum CMRR at 10 kHz (G = 1) 2.2 MHz bandwidth (G = 1) 150 dB minimum CMRR (G = 1000) 0.04% maximum gain error (G = 1000) 0.3 μV/°C maximum input offset drift 0.5 nA maximum input bias current 4.6 V to 36 V single supply ±2.3 V to ±18 V dual supply Input overvoltage protection: Gain range: 1 to 1000 | AmplifiersHealthcare
Aerospace and Defense
SPICE Models |
| Document | note |
| AD8422: High Performance, Low Power, Rail-to-Rail Precision Instrumentation Amplifier Data Sheet (Rev. A) | PDF 690 kB |
| Document | note |
| UG-261: Evaluation Boards for the AD62x, AD822x and AD842x Series | PDF 604 kB |
| Document | note |
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|---|---|---|---|---|---|
| AD8138ACHIPS Production | CHIPS OR DIE | REEL 360 | 25C | 0 | 8.8 | Y |
| AD8138AR Production | 8 ld SOIC | OTH 98 | -40 to 85C | 4.98 | 4.39 | N |
| AD8138AR-REEL7 Production | 8 ld SOIC | REEL 1000 | -40 to 85C | 0 | 4.39 | N |
| AD8138ARM Production | 8 ld MSOP | OTH 50 | -40 to 85C | 4.98 | 4.39 | N |
| AD8138ARM-REEL7 Production | 8 ld MSOP | REEL 1000 | -40 to 85C | 0 | 4.39 | N |
| AD8138ARMZ Production | 8 ld MSOP | OTH 50 | -40 to 85C | 4.3 | 3.75 | Y |
| AD8138ARMZ-REEL Production | 8 ld MSOP | REEL 3000 | -40 to 85C | 0 | 3.75 | Y |
| AD8138ARMZ-REEL7 Production | 8 ld MSOP | REEL 1000 | -40 to 85C | 0 | 3.75 | Y |
| AD8138ARZ Production | 8 ld SOIC | OTH 98 | -40 to 85C | 4.3 | 3.75 | Y |
| AD8138ARZ-R7 Production | 8 ld SOIC | REEL 1000 | -40 to 85C | 0 | 3.75 | Y |
| AD8138ARZ-RL Production | 8 ld SOIC | REEL 2500 | -40 to 85C | 0 | 3.75 | Y |
| AD8138SRMZ-EP-R7 Production | 8 ld MSOP | REEL 1000 | -55 to 105C | 0 | 6.75 | Y |
| Part Number | Description | Price | RoHS |
|---|---|---|---|
| EVAL-FDA-1CPZ-16 | Evaluation Bare Board for 16 Lead LFCSP | 18.25 | Y |
| EVAL-FDA-1RMZ-8 | Evaluation Bare Board for 8 Lead MSOP | 18.25 | Y |
| EVAL-FDA-1RZ-8 | Evaluation Bare Board for 8 Lead SOIC | 18.25 | Y |
| FDA-FILTER-CPZ | Evaluation Board Filter for LFCSP | 18.25 | Y |
