| Number of channels (#) | 1 |
| Vs (Max) (V) | 36 |
| Vs (Min) (V) | 4.5 |
| Input offset (+/-) (Max) (uV) | 500 |
| Gain (Min) (V/V) | 1 |
| Gain (Max) (V/V) | 10000 |
| Noise at 1 kHz (Typ) (nV/rt (Hz)) | 20 |
| Features | Overvoltage Protection |
| CMRR (Min) (dB) | 106 |
| Input offset drift (+/-) (Max) (uV/C) | 5 |
| 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 |
| Type | Resistor |
| 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-10 Hz (Typ) (uVpp) | 1 |
| Gain non-linearity (+/-) (Max) (%) | 0.005 |
- LOW BIAS CURRENT: ±4pA
- LOW QUIESCENT CURRENT: ±450μA
- LOW INPUT OFFSET VOLTAGE: ±200μV
- LOW INPUT OFFSET DRIFT: ±2μV/°C
- LOW INPUT NOISE: 20nV/sqrt(Hz) at f = 1kHz (G =100)
- HIGH CMR: 106dB
- WIDE SUPPLY RANGE: ±2.25V to ±18V
- LOW NONLINEARITY ERROR: 0.001% max
- INPUT PROTECTION TO ±40V
- 8-PIN DIP AND SO-8 SURFACE MOUNT
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.
