THS4531

Ultra Low Power, Rail-to-Rail Output, Fully-Differential Amplifier

FEATURES

• Ultra Low Power:

– Voltage: 2.5 V to 5.5 V

– Current: 250 µA

– Power-Down Mode: 0.5 µA (typ)

• Fully-Differential Architecture

• Bandwidth: 36 MHz

• Slew Rate: 200 V/µs

• THD: –120 dBc at 1 kHz (1 V_RMS, R_L= 2 kΩ)

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

• High DC Accuracy:

– V_OS Drift: ±4 µV/˚C (–40°C to +125°C)

– A_OL: 114 dB

• Rail-to-Rail Output (RRO)

• Negative Rail Input (NRI)

• Output Common-Mode Control

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

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:

• 8-pin SOIC (MSOP) and VSSOP (D and DGK)

• 10-pin WQFN (RUN)

ABSOLUTE MAXIMUM RATINGS

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