INA146 - High-Voltage, Programmable Gain Difference Amplifier

The INA146 is a precision difference amplifier that can be used to accurately attenuate high differential voltages and reject high common-mode voltages for compatibility with common signal processing voltage levels. High-voltage capability also affords inherent input protection. The input common-mode range ex-tends beyond both supply rails, making the INA146 well-suited for both single and dual supply applica-tions.

On-chip precision resistors are laser-trimmed to achieve accurate gain and high common-mode rejection. Ex-cellent TCR tracking of these resistors assures contin-ued high precision over temperature.

A 10:1 difference amplifier provides 0.1V/V gain when the output amplifier is used as a unity-gain buffer. In this configuration, input voltages up to ±100V can be measured. Gains greater than 0.1V/V can be set with an external resistor pair without affect-ing the common-mode input range.

The INA146 is available in the SO-8 surface-mount package specified for the extended industrial tempera-ture range, -40°C to +85°C.

• HIGH COMMON-MODE VOLTAGE:
  • +40V at V S = +5V
  • ±100V at V S = ±15V
• DIFFERENTIAL GAIN = 0.1V/V TO 100V/V:
  • Set with External Resistors
• LOW QUIESCENT CURRENT: 570µA
• WIDE SUPPLY RANGE:
  • Single Supply: 4.5V to 36V
  • Dual Supplies: ±2.25V to ±18V
• LOW GAIN ERROR: 0.025%
• HIGH CMR: 80dB
• SO-8 PACKAGE