INA128 Precision, 130-dB CMRR, 700-µA, Low-Power, Instrumentation Amplifier | TI.com

INA128 (ACTIVE)

Precision, 130-dB CMRR, 700-µA, Low-Power, Instrumentation Amplifier

 

Obtain higher GBW (2MHz), higher DC precision (35µV max Vos, 0.4 µV/C max drift), higher CMRR (140dB Min) and lower bias current (0.5nA max) while reducing BOM cost with the INA819.

Obtain higher GBW (2MHz), identical DC precision, higher CMRR (140dB Min) and lower bias current (0.6nA max) while reducing BOM cost with the  INA828.

Description

The INA128 and INA129 are low-power, general purpose instrumentation amplifiers offering excellent accuracy. The versatile 3-op amp design and small size make these amplifiers ideal for a wide range of applications. Current-feedback input circuitry provides wide bandwidth even at high gain (200 kHz at G = 100).

A single external resistor sets any gain from 1 to 10,000. The INA128 provides an industry-standard gain equation; the INA129 gain equation is compatible with the AD620.

The INA12x is laser-trimmed for very low offset voltage (50 µV), drift (0.5 µV/°C) and high common-mode rejection (120 dB at G ≥ 100). The INA12x operates with power supplies as low as ±2.25 V, and quiescent current is only 700 µA, ideal for battery-operated systems. Internal input protection can withstand up to ±40 V without damage.

The INA12x is available in 8-pin plastic DIP and SO-8 surface-mount packages, specified for the –40°C to +85°C temperature range. The INA128 is also available in a dual configuration, the INA2128.

Features

  • Low Offset Voltage: 50 µV Maximum
  • Low Drift: 0.5 µV/°C Maximum
  • Low Input Bias Current: 5 nA Maximum
  • High CMR: 120 dB minimum
  • Inputs Protected to ±40 V
  • Wide Supply Range: ±2.25 V to ±18 V
  • Low Quiescent Current: 700 µA
  • 8-Pin Plastic Dip, SO-8

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Parametrics

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Part number Order Number of channels (#) Vs (Min) (V) Vs (Max) (V) CMRR (Min) (dB) Input offset (+/-) (Max) (uV) Input offset drift (+/-) (Max) (uV/C) Input bias current (+/-) (Max) (nA) Noise at 1 kHz (Typ) (nV/rt (Hz)) Iq (Typ) (mA) Bandwidth at min gain (Typ) (MHz) Gain (Min) (V/V) Gain (Max) (V/V) Gain error (+/-) (Max) (%) Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Noise at 0.1 Hz-10 Hz (Typ) (uVpp) Gain non-linearity (+/-) (Max) (%)
INA128 Order now 1     4.5     36     120     50     0.5     5     8     0.7     1.3     1     10000     2     -40 to 125     PDIP | 8
SOIC | 8    
See datasheet (PDIP)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)    
0.2     0.012    
INA819 Samples not available 1     4.5     36     140     35     0.4     0.5     8     0.35     2     1     1000     0.15     -40 to 125     SOIC | 8     8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)     0.19     0.001    
INA828 Order now 1     4.5     36     140     50     0.5     0.6     7     0.6     2     1     1000     0.15     -40 to 125     SOIC | 8     8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)     0.14     0.001