FEATURES

TO SINGLE-SUPPLY ADCs

APPLICATIONS

CONVERSION

DESCRIPTION

The INA159 is a high slew rate, G = 1/5 difference amplifier

consisting of a precision op amp with a precision resistor

network. The gain of 1/5 makes the INA159 useful to

couple ±10V signals to single-supply analog-to-digital

converters (ADCs), particularly those operating on a single

+5V supply. The on-chip resistors are laser-trimmed for

accurate gain and high common-mode rejection. Excellent

temperature coefficient of resistance (TCR) tracking of the

resistors maintains gain accuracy and common-mode

rejection over temperature. The input common-mode

voltage range extends beyond the positive and negative

supply rails. It operates on a total of +1.8V to +5.5V single

or split supplies. The INA159 reference input uses two

resistors for easy mid-supply or reference biasing.

The difference amplifier is the foundation of many

commonly-used circuits. The INA159 provides this circuit

function without using an expensive external precision

resistor network. The INA159 is available in an MSOP-8

surface-mount package and is specified for operation over

the extended industrial temperature range, −40°C to

+125°C.

20k

Ω

100k

Ω

40k

Ω

100k

Ω

40k

Ω

100

Ω

ADS8325

ADC

DCLOCK

CS

REF

5V

+IN

−IN

V+

V+

GND

1000pF

SENSE

REF 2

REF 1

+IN

−IN

INA159

Figure 1. Typical Application

PRODUCTION DATA information is current as of publication date. Products

conform to specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all parameters.

INA159

SBOS333B − JULY 2005 − REVISED OCTOBER 2005

Precision, Gain of 0.2 Level Translation

DIFFERENCE AMPLIFIER

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