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OPA1679
  • OPA1679
  • OPA1679
  • OPA1679
  • OPA1679

OPA1679

ACTIVE

Low distortion (-120 dB), low noise (4.5nV/rtHz), quad audio op amp

Texas Instruments OPA1679 Product Info

1 April 2026 4

Parameters

Number of channels

4

Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V)

4.5

Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V)

36

GBW (typ) (MHz)

16

Slew rate (typ) (V/µs)

9

Rail-to-rail

Out

Vos (offset voltage at 25°C) (max) (mV)

2

Iq per channel (typ) (mA)

2

Vn at 1 kHz (typ) (nV√Hz)

4.5

Features

Small Size

THD + N at 1 kHz (typ) (%)

0.0001

Rating

Catalog

Operating temperature range (°C)

-40 to 85

Iout (typ) (A)

0.05

Architecture

CMOS

CMRR (typ) (dB)

110

Package

SOIC (D)-14-51.9 mm² 8.65 x 6

Features

  • Low noise: 4.5 nV/√Hz at 1 kHz
  • Low distortion: 0.0001% at 1 kHz
  • High open-loop gain: 114 dB
  • 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
  • Single, dual, and quad-channel versions
  • Available packages:
    • Single: SOIC-8, SOT-23
    • Dual: SOIC-8, small SON-8, VSSOP-8
    • Quad: Small QFN-16, SO-14, TSSOP-14
  • Temperature range: –40°C to +85°C
  • Low noise: 4.5 nV/√Hz at 1 kHz
  • Low distortion: 0.0001% at 1 kHz
  • High open-loop gain: 114 dB
  • 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
  • Single, dual, and quad-channel versions
  • Available packages:
    • Single: SOIC-8, SOT-23
    • Dual: SOIC-8, small SON-8, VSSOP-8
    • Quad: Small QFN-16, SO-14, TSSOP-14
  • Temperature range: –40°C to +85°C

Description

The single-channel OPA1677, dual-channel OPA1678, and quad-channel OPA1679 (OPA167x) op amps 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. These devices also offer rail-to-rail output swing to within 800 mV with a 2-kΩ load, which increases headroom and maximizes dynamic range.

To accommodate the power-supply constraints of many types of audio products, the OPA167x 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. These op amps are unity-gain stable and have excellent dynamic behavior over a wide range of load conditions, allowing the OPA167x 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.

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