Low-power, 60-MHz, wide-supply-range fully differential amplifier

The THS4561 fully differential

amplifier (FDA) offers a simple interface from single-ended sources to the

differential output required by precision analog-to-digital converters (ADCs).

Designed for a very low,8-Hz, 1/f voltage noise corner

and low, 130-dB total harmonic distortion (THD) while consuming only a775-µA quiescent current, the THS4561 is well suited

for power-sensitive data acquisition (DAQ) systems where high performance is

required with the best signal-to-noise ratio (SNR) and spurious-free dynamic range

(SFDR) through the amplifier and ADC combination.

The THS4561 features the required

negative rail input when interfacing a DC-coupled, ground-centered, source signal to

a single-supply, differential-input ADC. Low DC error and drift terms support the

emerging high-speed and high-resolution successive approximation register (SAR) and

delta-sigma (ΔΣ) ADC input requirements. A 2.85-V to 12.6-V supply range with a

flexible output common-mode setting with low headroom to the supplies supports a

wide range of ADC input and digital-to-analog converter (DAC) output

requirements.

The THS4561 device is characterized

for operation from –40°C to +125°C.