OPA1678 Low Distortion, Low Noise, General Purpose Audio Op Amp | TI.com

OPA1678 (ACTIVE)

Low Distortion, Low Noise, General Purpose Audio Op Amp

 

For a low voltage (1.7V to 5.5V) audio op amp with higher DC precision (1.25µV max Vos, 0.3µV/°C drift), similar AC specifications and added RRIO operation, see  OPA1671.

Description

The OPA1678 (dual-channel) and OPA1679 (quad-channel) operational amplifiers offer higher system-level performance over legacy op amps commonly used in audio circuitry. The OPA167x amplifiers achieve a low 4.5-nV/√Hz noise density and low distortion of 0.0001% at 1 kHz, which improves audio signal fidelity. They also offer rail-to-rail output swing to within 800 mV with a 2-kΩ load, which increases headroom and maximizes dynamic range.

The OPA1678 and OPA1679 operate over a very wide supply range of ±2.25 V to ±18 V or (4.5 V to 36 V) on only 2 mA of supply current to accommodate the power supply constraints of many types of audio products. These op amps are unity-gain stable and have excellent dynamic behavior over a wide range of load conditions allowing them to be used in many audio circuits.

The OPA167x amplifiers use completely independent internal circuitry for lowest crosstalk and freedom from interactions between channels, even when overdriven or overloaded.

The OPA167x temperature ranges are specified from –40°C to +85°C.

Features

  • Low Noise: 4.5 nV/√Hz at 1 kHz
  • Low Distortion: 0.0001% at 1 kHz
  • High Open-Loop Gain: 114dB
  • High Common-Mode Rejection: 110 dB
  • Low Quiescent Current:
    • 2 mA Per Channel
  • Low Input Bias Current: 10 pA (Typical)
  • Slew Rate: 9 V/µs
  • Wide Gain Bandwidth: 16 MHz (G = 1)
  • Unity-Gain Stable
  • Rail-to-Rail Output
  • Wide Supply Range:
    • ±2.25 V to ±18 V, or 4.5 V to 36 V
  • Dual-Channel and Quad-Channel Versions
  • Small Package Sizes:
    • Dual-Channel: SO-8, MSOP-8, SON-8
    • Quad-Channel: SO-14, TSSOP-14, QFN-16

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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) GBW (Typ) (MHz) Slew rate (Typ) (V/us) Rail-to-rail Vos (offset voltage @ 25 C) (Max) (mV) Iq per channel (Typ) (mA) Vn at 1 kHz (Typ) (nV/rtHz) Features THD + N @ 1 kHz (Typ) (%) Rating Operating temperature range (C) Package Group Output current (Typ) (mA) Package size: mm2:W x L (PKG) Architecture CMRR (Typ) (dB) Input bias current (Max) (pA)
OPA1678 Order now 2     4.5     36     16     9     Out     2     2     4.5    
   
0.0001     Catalog     -40 to 85     SOIC | 8
SON | 8
VSSOP | 8    
50     8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
See datasheet (SON)
8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)    
FET     110      
OPA1642 Order now 2     5     36     11     20     In to V-
Out    
3.5     1.8     5.1     Burr-Brown™ Audio
Premium Sound    
0.00005     Catalog     -40 to 85     SOIC | 8
VSSOP | 8    
30     8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)    
FET     126     20    
OPA1656 Samples not available 2     4.5     36     50     23     Out     1     4.0     4.0     Burr-Brown™ Audio
Premium Sound    
0.00001     Catalog     -55 to 125     SOIC | 8     100     8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)     CMOS     136     10    
OPA1671 Samples not available 1     1.7     5.5     13     5     In
Out    
1.25     0.94     7       0.00035     Catalog     -40 to 125     SC70 | 5     66     5SC70: 4 mm2: 2.1 x 2 (SC70 | 5)     CMOS     102      
OPA1679 Order now 4     4.5     36