The INA128-HT and INA129-HT are low-power, general-purpose instrumentation amplifiers offering excellent accuracy. The versatile three-operational-amplifier design and small size make them ideal for a wide range of applications. Current-feedback input circuitry provides wide bandwidth even at high gain. A single external resistor sets any gain from 1 to 10000. The INA128-HT provides an industry-standard gain equation; the INA129-HT gain equation is compatible with the AD620.
The INA128-HT and INA129-HT are laser trimmed for very low offset voltage (25 µV Typ) and high common-mode rejection (93 dB at G ≥ 100). These devices operate with power supplies as low as ±2.25 V, and quiescent current of 2 mA, typically. Internal input protection can withstand up to ±40 V without damage.
Texas Instruments' high-temperature products use highly optimized silicon (die) solutions with design and process enhancements to maximize performance over extended temperatures.
The INA129-HT is available in 8-pin ceramic DIP and 8-pin ceramic surface-mount packages, specified for the –55°C to 210°C temperature range. The INA128-HT is available in an 8-pin SOIC-8 surface-mount package, specified for the –55°C to 175°C temperature range.
(1) Typical values for 210°C application.
(2) Custom temperature ranges available.
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| Number of channels | 1 |
| Vs (max) (V) | 36 |
| Vs (min) (V) | 4.5 |
| Input offset (±) (max) (µV) | 125 |
| Voltage gain (min) (V/V) | 1 |
| Voltage gain (max) (V/V) | 10000 |
| Noise at 1 kHz (typ) (nV√Hz) | 8 |
| Features | Current Feedback, Overvoltage protection |
| CMRR (min) (dB) | 113 |
| Input offset drift (±) (max) (V/°C) | 0.000001 |
| Input bias current (±) (max) (nA) | 10 |
| Iq (typ) (mA) | 0.7 |
| Bandwidth at min gain (typ) (MHz) | 1.3 |
| Gain error (±) (max) (%) | 0.7 |
| Operating temperature range (°C) | -55 to 175 |
| Rating | High Temp |
| Type | Resistor |
| Gain nonlinearity (±) (max) (%) | 0.002 |
| Output swing headroom (to negative supply) (typ) (V) | 0.8 |
| Output swing headroom (to positive supply) (typ) (V) | -0.9 |
| Input common mode headroom (to negative supply) (typ) (V) | 1.7 |
| Input common mode headroom (to positive supply) (typ) (V) | -1.4 |
| Noise at 0.1 Hz to 10 Hz (typ) (µVPP) | 0.2 |
| SOIC (D) | 8 | 29.4 mm² 4.9 x 6 |
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