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: