Amp Interfaces Differential Signals To Single-Supply ADCs

Nov. 7, 2005

The INA159 interfaces ±10-V signals from sensors in industrial applications to singlesupply analog-to-digital converters (ADCs). Developed by Texas Instruments, this levelshifting difference amplifier presents an economical alternative to using complicated and expensive precision resistor networks and a high-performance operational amplifier with a dual-supply ADC.

It's especially suited for driving up to 14-bit ADCs. A split reference connection simplifies biasing at one-half the supply or reference voltage and eliminates the need for an additional op amp. The single-supply voltage ranges from 2.7 to 5.5 V. The device features low offset (500 µV maximum), high gain accuracy (0.024% maximum), low quiescent current (1.5 mA maximum), and a –40°C to 125°C temperature range.

Housed in an eight-lead MSOP, the INA159 starts at $1.59 in 1000-piece quantities.

Texas Instruments
www.ti.com