The INA125 is a low power, high accuracy instrumentation amplifier with a precision voltage reference. It provides complete bridge excitation and precision differential-input amplification on a single integrated circuit.
A single external resistor sets any gain from 4 to 10,000. The INA125 is laser-trimmed for low offset voltage (250µV), low offset drift (2µV/°C), and high common-mode rejection (100dB at G = 100). It operates on single (+2.7V to +36V) or dual (±1.35V to ±18V) supplies.
The voltage reference is externally adjustable with pin-selectable voltages of 2.5V, 5V, or 10V, allowing use with a variety of transducers. The reference voltage is accurate to ±0.5% (max) with ±35ppm/°C drift (max). Sleep mode allows shutdown and duty cycle operation to save power.
The INA125 is available in 16-pin plastic DIP and SO-16 surface-mount packages and is specified for the -40°C to +85°C industrial temperature range.
| Number of channels | 1 |
| Vs (max) (V) | 36 |
| Vs (min) (V) | 2.7 |
| Input offset (±) (max) (µV) | 250 |
| Voltage gain (min) (V/V) | 4 |
| Voltage gain (max) (V/V) | 10000 |
| Noise at 1 kHz (typ) (nV√Hz) | 38 |
| Features | Overvoltage protection |
| CMRR (min) (dB) | 100 |
| Input offset drift (±) (max) (V/°C) | 0.000002 |
| Input bias current (±) (max) (nA) | 25 |
| Iq (typ) (mA) | 0.46 |
| Bandwidth at min gain (typ) (MHz) | 0.15 |
| Gain error (±) (max) (%) | 0.5 |
| Operating temperature range (°C) | -40 to 85 |
| Rating | Catalog |
| Type | Resistor |
| Gain nonlinearity (±) (max) (%) | 0.004 |
| Output swing headroom (to negative supply) (typ) (V) | 0.4 |
| Output swing headroom (to positive supply) (typ) (V) | -0.9 |
| Input common mode headroom (to negative supply) (typ) (V) | 4.3 |
| Input common mode headroom (to positive supply) (typ) (V) | -4.8 |
| Noise at 0.1 Hz to 10 Hz (typ) (µVPP) | 0.8 |
| PDIP (N) | 16 | 181.42 mm² 19.3 x 9.4 |
| SOIC (D) | 16 | 59.4 mm² 9.9 x 6 |
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