The INA331 and INA2331 are rail-to-rail output, low-power CMOS instrumentation amplifiers that offer wide range, single-supply operation as well as bipolar-supply operation. The INA331 family provides low-cost, low-noise amplification of differential signals with a low quiescent current of 415µA (dropping to 0.01µA when shutdown). Returning to normal operation within microseconds, this INA can be used for battery or multi-channel applications.
Configured internally in a gain of 5V/V, the INA331 offers flexibility in higher gains by choosing external resistors.
The INA331 rejects line noise and its harmonics, because common-mode error remains low even at higher frequencies.
High bandwidth and slew rate makes the INA331 ideal for directly driving sampling Analog-to-Digital (A/D) converters as well as general-purpose applications.
With high precision, low cost, and small packages, the INA331 outperforms discrete designs. They are specified for a wide temperature range of -55°C to +125°C.
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| Number of channels | 2 |
| Vs (max) (V) | 5.5 |
| Vs (min) (V) | 2.5 |
| Input offset (±) (max) (µV) | 1000 |
| Voltage gain (min) (V/V) | 5 |
| Voltage gain (max) (V/V) | 1000 |
| Noise at 1 kHz (typ) (nV√Hz) | 46 |
| Features | Cost Optimized, Shutdown |
| CMRR (min) (dB) | 80 |
| Input bias current (±) (max) (nA) | 0.01 |
| Iq (typ) (mA) | 0.415 |
| Bandwidth at min gain (typ) (MHz) | 2 |
| Gain error (±) (max) (%) | 0.1 |
| Operating temperature range (°C) | -55 to 125 |
| Rating | Catalog |
| Type | Resistor |
| Gain nonlinearity (±) (max) (%) | 0.01 |
| Output swing headroom (to negative supply) (typ) (V) | 0.025 |
| Output swing headroom (to positive supply) (typ) (V) | -0.025 |
| Input common mode headroom (to negative supply) (typ) (V) | 0.55 |
| Input common mode headroom (to positive supply) (typ) (V) | -1.7 |
| Noise at 0.1 Hz to 10 Hz (typ) (µVPP) | 7 |
| TSSOP (PW) | 14 | 32 mm² 5 x 6.4 |
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