1 Features

1. Ultra Low Power:

. Voltage: 2.5 V to 5.5 V

. Current: 250 μA

. Power-Down Mode: 0.5 μA (typical)

. Fully-Differential Architecture

. Bandwidth: 36 MHz

. Slew Rate: 200 V/μs

. THD: .120 dBc at 1 kHz (1 VRMS, RL= 2 kΩ)

. Input Voltage Noise: 10 nV/√Hz (f = 1 kHz)

. High DC Accuracy:

. VOS Drift: ±4 μV/˚C (.40°C to +125°C)

. AOL: 114 dB

. Rail-to-Rail Output (RRO)

. Negative Rail Input (NRI)

. Output Common-Mode Control

2 Applications

• Low-Power SAR, ΔΣ ADC Driver

• Low Power, High Performance:

– Differential to Differential Amplifier

– Single-Ended to Differential Amplifier

• Low-Power, Wide-Bandwidth Differential Driver

• Low-Power, Wide-Bandwidth Differential Signal

Conditioning

• High Channel Count and Power Dense Systems

3 Description

The THS4531 is a low-power, fully-differential op amp

with input common-mode range below the negative

rail and rail-to-rail output. The device is designed for

low-power data acquisition systems and high density

applications where power consumption and

dissipation is critical.

The device features accurate output common-mode

control that allows for dc coupling when driving

analog-to-digital converters (ADCs). This control,

coupled with the input common-mode range below

the negative rail and rail-to-rail output, allows for easy

interface from single-ended ground-referenced signal

sources to successive-approximation registers

(SARs), and delta-sigma (ΔΣ) ADCs using only

single-supply 2.5 V to 5 V power. The THS4531 is

also a valuable tool for general-purpose, low-power

differential signal conditioning applications.

The THS4531 is characterized for operation over the

extended industrial temperature range from –40°C to

+125°C. The following package options are available: