THS4521 Very low power rail-to-rail output fully differential amplifier |


Very low power rail-to-rail output fully differential amplifier

Very low power rail-to-rail output fully differential amplifier - THS4521

Recommended alternative parts

  • THS4551  - The device has the SAME FUNCTIONALITY and PINOUT as the compared device but is NOT an exact equivalent.   The THS4551 offers significantly lower noise, offset and drift and improved harmonic distortion compared to the THS4521


The THS4521, THS4522, and THS4524 family of devices are very low-power, fully differential amplifiers with rail-to-rail output and an input common-mode range that includes the negative rail. These amplifiers are designed for low-power data acquisition systems and high-density applications where power dissipation is a critical parameter, and provide exceptional performance in audio applications.

The family includes single FDA (THS4521), dual FDA (THS4522), and quad FDA (THS4524) versions.

These fully differential amplifiers feature accurate output common-mode control that allows for dc-coupling when driving analog-to-digital converters (ADCs). This control, coupled with an input common-mode range below the negative rail as well as rail-to-rail output, allows for easy interfacing between single-ended, ground-referenced signal sources. Additionally, these devices are ideally suited for driving both successive-approximation register (SAR) and delta-sigma (ΔΣ) ADCs using only a single +2.5V to +5V and ground power supply.

The THS4521, THS4522, and THS4524 family of fully differential amplifiers is characterized for operation over the full industrial temperature range from –40°C to +85°C.


  • Fully Differential Architecture
  • Bandwidth: 145 MHz (AV = 1 V/V)
  • Slew Rate: 490 V/µs
  • HD2: –133 dBc at 10 kHz (1 VRMS,
    RL = 1 kΩ)
  • HD3: –141 dBc at 10 kHz (1 VRMS,
    RL = 1 kΩ)
  • Input Voltage Noise: 4.6 nV/√Hz
    (f = 100 kHz)
  • THD+N: –112dBc (0.00025%) at
    1 kHz (22-kHz BW, G = 1, 5 VPP)
  • Open-Loop Gain: 119 dB (DC)
  • NRI–Negative Rail Input
  • RRO–Rail-to-Rail Output
  • Output Common-Mode Control
    (with Low Offset)
  • Power Supply:
    • Voltage: +2.5 V (±1.25 V) to
      +5.5 V (±2.75 V)
    • Current: 1.14 mA/ch
  • Power-Down Capability: 20 µA (typical)

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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
THS4521 THS4551
Voltage FB     Bipolar
Fully Differential
Voltage FB    
1     1    
2.5     2.7    
5.5     5.4    
145     150    
1     1    
490     220    
4.6     3.3    
5.2     3.3    
1.14     1.35    
2     0.175    
In to V-
In to V-
Shutdown     Small Size
Catalog     Catalog    
-40 to 85     -40 to 125    
8SOIC: 29 mm2: 6 x 4.9(SOIC)
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)    
102     110    
900000     1500000    
2     0.45    
95     135    
55     45    
133     128    
141     139    
0.001     0.1    

Other qualified versions of THS4521

Version Part Number Definition
High-Temperature THS4521-HT High-Temperature product for harsh environments