OPA1678 Datasheet, PDF (1/41 Pages) Texas Instruments – Low-Distortion Audio Operational Amplifiers

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OPA1678, OPA1679
SBOS855 – FEBRUARY 2017
OPA167x Low-Distortion Audio Operational Amplifiers
1 Features
•1 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 and MSOP-8
Quad-Channel: SO-14 and TSSOP-14
2 Applications
• Analog Signal Conditioning
• Analog and Digital Mixers
• Audio Effects Pedals
• A/V Receivers
• Car Audio Systems
3 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
provide 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.
SoundPlus™
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
OPA1678
SOIC (8)
VSSOP (8)
4.90 mm × 3.91 mm
3.00 mm × 3.00 mm
OPA1679
SOIC (14)
TSSOP (14)
8.65 mm × 3.91 mm
5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Internal Schematic
THD+N vs Frequency (2-kΩ Load)
V+
Tail
Current
V_BIAS1
0.1
Gain = 10 V/V
Gain = 1 V/V
Gain = -1 V/V
V_IN+
0.01
Class AB
Control
V_O
Circuitry
V_IN-
0.001
V_BIAS2
-60
-80
-100
0.0001
-120
V-
Copyright © 2017, Texas Instruments Incorporated
0.00001
-140
10
100
1k
10k
Frequency (Hz)
C002
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.