(ACTIVE) Sound-Plus High-Performance, JFET-Input Audio OpAmps


Functional Diagram


The OPA1641 (single), OPA1642 (dual), and OPA1644 (quad) series are JFET-input, ultralow distortion, low-noise operational amplifiers fully specified for audio applications.

The OPA1641, OPA1642, and OPA1644 rail-to-rail output swing allows increased headroom, making these devices ideal for use in any audio circuit. Features include 5.1-nV/√Hz noise, low THD+N (0.00005%), a low input bias current of 2 pA, and low quiescent current of 1.8 mA per channel.

These devices operate over a very wide supply voltage range of ±2.25 V to ±18 V. The OPA1641, OPA1642, and OPA1644 series of operational amplifiers are unity-gain stable and provide excellent dynamic behavior over a wide range of load conditions.

The dual and quad versions feature completely independent circuitry for lowest crosstalk and freedom from interactions between channels, even when overdriven or overloaded.

The OPA1641, OPA1642, and OPA1644 are specified from –40°C to +85°C.


  • Superior Sound Quality
  • True JFET Input Operational Amplifier
    With Low Input Bias Current
  • Low Noise: 5.1 nV/√Hz at 1 kHz
  • Ultralow Distortion: 0.00005% at 1 kHz
  • High Slew Rate: 20 V/µs
  • Unity Gain Stable
  • No Phase Reversal
  • Low Quiescent Current:
    1.8 mA per Channel
  • Rail-to-rail Output
  • Wide Supply Range: ±2.25 V to ±18 V
  • Single, Dual, and Quad Versions Available


Number of channels (#) 2    
Total Supply Voltage (Min) (+5V=5, +/-5V=10) 5    
Total Supply Voltage (Max) (+5V=5, +/-5V=10) 36    
GBW (Typ) (MHz) 11    
Slew Rate (Typ) (V/us) 20    
Rail-to-rail In to V-^Out    
Vos (offset voltage @ 25 C) (Max) (mV) 3.5    
Iq per channel (Typ) (mA) 1.8    
Vn at 1 kHz (Typ) (nV/rtHz) 5.1    
Features Burr-Brown™ Audio^Premium Sound    
THD + N @ 1 kHz (Typ) (%) 0.00005    
Rating Catalog    
Operating temperature range (C) -40 to 85    
Package Group SOIC|8^VSSOP|8    
Output current (Typ) (mA) 30    
Package size: mm2:W x L (PKG) 8SOIC: 29 mm2: 6 x 4.9 (SOIC|8)^8VSSOP: 15 mm2: 4.9 x 3 (VSSOP|8)    
Architecture FET    
CMRR (Typ) (dB) 126    
Input bias current (Max) (pA) 20    

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