THS4561

• Bandwidth: 60 MHz (G = 1 V/V)
• Slew Rate: 315 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 V_PP, 100 kHz
  • HD3: –124 dBc at 2 V_PP, 100 kHz
• 0.01% Settling (2-V Step): 90 ns

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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 on 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.