1 Features

. Bandwidth: 60 MHz (G = 1 V/V)

. Slew Rate: 230 V/μs

. Gain Bandwidth Product: 68 MHz

. Voltage Noise:

. 1/f Voltage Noise Corner: 8 Hz

. Broadband Noise (≥ 500 Hz): 4 nV/√ Hz

. Input Offset: ±250 μV (Maximum)

. Drift: ±4 μV/°C (Maximum)

. Supply Operating Range: 2.85 V to 12.6 V

. Supply Current: 775 μA

. Negative Rail Input (NRI)

. Rail-to-Rail Output (RRO)

. Very Low Harmonic Distortion:

. HD2: .117 dBc at 2 VPP, 100 kHz

. HD3: .124 dBc at 2 VPP, 100 kHz

. 0.01% Settling (2-V Step): 90 ns

2 Applications

• 16-bit to 20-bit, Differential, SAR and ΔΣ Drivers

• Differential Active Filters

• High Output Swing PCM Audio DAC Outputs

• Medical Ultrasounds

• Battery Testers

• Power Analyzers

• Lower Power Alternate to the THS4551

3 Description

The THS4561 fully differential amplifier (FDA) offers a

simple interface from single-ended sources to the

differential output required by precision analog-todigital

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 a

775-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.