THS4561 Low-power, 60-MHz, wide-supply-range fully differential amplifier | TI.com

THS4561
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Low-power, 60-MHz, wide-supply-range fully differential amplifier

 

Description

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.

 

Features

  • 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 VPP, 100 kHz
    • HD3: –124 dBc at 2 VPP, 100 kHz
  • 0.01% settling (2-V step): 90 ns

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Parametrics

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Part number Order Number of channels (#) Total supply voltage (Min) (+5V=5, +/-5V=10) Total supply voltage (Max) (+5V=5, +/-5V=10) BW @ Acl (MHz) Acl, min spec gain (V/V) Slew rate (Typ) (V/us) Vn at flatband (Typ) (nV/rtHz) Iq per channel (Typ) (mA) Rail-to-rail Vos (offset voltage @ 25 C) (Max) (mV) Operating temperature range (C) Package Group Output current (Typ) (mA) 2nd harmonic (dBc) 3rd harmonic (dBc) Package size: mm2:W x L (PKG) GBW (Typ) (MHz) Input bias current (Max) (pA) @ MHz Gain (Max) (dB) CMRR (Typ) (dB)
THS4561 Order now 1     2.85     12.6     60     1     315     4     0.78     In to V-
Out    
0.25     -40 to 125     VSSOP | 8     27     117     124     8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)     60     600000         110    
THS4521 Order now 1     2.5     5.5     145     1     490     4.6     1.14     In to V-
Out    
2     -40 to 85     SOIC | 8
VSSOP | 8    
55     133     141     8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)    
95     900000     0.001       102    
THS4531 Order now 1     2.5     5.5     36     1     220     10     0.25     Out     1     -40 to 125     QFN | 10
SOIC | 8
VSSOP | 8    
26     128     137     10QFN: 4 mm2: 2 x 2 (QFN | 10)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)    
30     210000     0.001     -15     116    
THS4531A Order now 1     2.5     5.5     36     1     220     10