The INA121 is a FET-input, low power instrumentation amplifier offering excellent accuracy. Its versatile three-op amp design and very small size make it ideal for a variety of general purpose applications. Low bias current (±4pA) allows use with high impedance sources.
Gain can be set from 1V to 10,000V/V with a single external resistor. Internal input protection can withstand up to ±40V without damage.
The INA121 is laser-trimmed for very low offset voltage (±200µV), low offset drift (±2µV/°C), and high common-mode rejection (106dB at G = 100). It operates on power supplies as low as ±2.25V (+4.5V), allowing use in battery operated and single 5V systems. Quiescent current is only 450µA.
Package options include 8-pin plastic DIP and SO-8 surface mount. All are specified for the -40°C to +85°C industrial temperature range.
| Number of channels | 1 |
| Vs (max) (V) | 36 |
| Vs (min) (V) | 4.5 |
| Input offset (±) (max) (µV) | 500 |
| Voltage gain (min) (V/V) | 1 |
| Voltage gain (max) (V/V) | 10000 |
| Noise at 1 kHz (typ) (nV√Hz) | 20 |
| Features | Overvoltage protection |
| CMRR (min) (dB) | 106 |
| Input offset drift (±) (max) (V/°C) | 0.000005 |
| Input bias current (±) (max) (nA) | 0.05 |
| Iq (typ) (mA) | 0.45 |
| Bandwidth at min gain (typ) (MHz) | 0.6 |
| Gain error (±) (max) (%) | 0.5 |
| Operating temperature range (°C) | -40 to 85 |
| Rating | Catalog |
| Type | Resistor |
| Gain nonlinearity (±) (max) (%) | 0.005 |
| Output swing headroom (to negative supply) (typ) (V) | 0.15 |
| Output swing headroom (to positive supply) (typ) (V) | -0.9 |
| Input common mode headroom (to negative supply) (typ) (V) | 2 |
| Input common mode headroom (to positive supply) (typ) (V) | -2 |
| Noise at 0.1 Hz to 10 Hz (typ) (µVPP) | 1 |
| PDIP (P) | 8 | 92.5083 mm² 9.81 x 9.43 |
| SOIC (D) | 8 | 29.4 mm² 4.9 x 6 |
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