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.