Low Power, 70MHz, High Supply Range, Fully Differential Amplifier

Low Power, 70MHz, High Supply Range, Fully Differential Amplifier - THS4561

Sample Availability

Prototype samples are available (XTHS4561IDGKR and XTHS4561IRGT). Order Now


The THS4561 fully differential amplifier (FDA) offers a simple interface from single-ended sources to the differential output required by high-precision analog-to-digital converters (ADCs). Designed for exceptional dc accuracy, low noise, and ultra-low harmonic distortion, the device is well suited for data acquisition systems where high precision 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. Very low dc error and drift terms support the emerging 16-bit to 20-bit successive approximation register (SAR) 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 will be available in a dual-channel device as the THS4562 in a VQFN-24 package.



  • Bandwidth: 70 MHz (G = 1 V/V)
  • Differential Output Slew Rate: 130 V/µs
  • Gain Bandwidth Product: 60 MHz
  • Negative Rail Input (NRI)
  • Rail-to-Rail Output (RRO)
  • Wide Output Common-Mode Control Range
  • Single-Supply Operating Range: 2.85 V to 12.6 V
  • Trimmed-Supply Current: 830 µA at ±5 V
  • 25°C Input Offset: ±200 µV (Maximum)
  • Input Offset Voltage Drift: ±2 µV/°C (Maximum)
  • Differential Input Voltage Noise: 4.5 nV/√Hz
  • Very Low 50–Hz 1/f Voltage Noise Corner
  • Very Low Harmonic Distortion
    • HD2: –115 dBc at 2-VPP, 100-kHz
    • HD3: –110 dBc at 2-VPP, 100-kHz
  • < 4-V Step Response Settling to 0.01%: < 100 ns

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Parametrics Compare all products in High-Speed Op Amps (GBW>=50MHz)

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)
Vn at 1kHz (Typ) (nV/rtHz)
Iq per channel (Typ) (mA)
Vos (Offset Voltage @ 25C) (Max) (mV)
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
CMRR (Typ) (dB)
Input Bias Current (Max) (pA)
Offset Drift (Typ) (uV/C)
GBW (Typ) (MHz)
Output Current (Typ) (mA)
2nd Harmonic (dBc)
3rd Harmonic (dBc)
@ MHz
THS4561 THS4551 THS4552
Fully Differential    Bipolar
Fully Differential
Voltage FB   
Fully Differential
Voltage FB   
1    1    2   
2.85    2.7    2.7   
12.6    5.4    5.4   
70    150    150   
1    1    1   
130    220    220   
5    3.3    3.3   
5    3.3    3.3   
0.82    1.35    1.37   
0.2    0.175    0.265   
In to V-
In to V-
In to V-
Shutdown    Small Size
Catalog    Catalog    Catalog   
-40 to 125    -40 to 125    -40 to 125   
16VQFN: 9 mm2: 3 x 3(VQFN)
8VSSOP: 15 mm2: 4.9 x 3(VSSOP)   
10QFN: 4 mm2: 2 x 2(QFN)
16VQFN: 9 mm2: 3 x 3(VQFN)
8VSSOP: 15 mm2: 4.9 x 3(VSSOP)   
16TSSOP: 32 mm2: 6.4 x 5(TSSOP)
24WQFN: 16 mm2: 4 x 4(WQFN)   
110    110    110   
200000    1500000    1500000   
0.3    0.45    0.45   
60    135    135   
35    45    65   
110    128    128   
115    139    139   
  0.1    0.1   

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