Overview
The OPA1678IDR is a dual-channel, low-distortion audio operational amplifier produced by Texas Instruments. It is part of the OPA167x series, which includes single-channel (OPA1677), dual-channel (OPA1678), and quad-channel (OPA1679) versions. These amplifiers are designed to offer high system-level performance, particularly in audio circuitry, with features such as low noise, low distortion, and high open-loop gain.
The OPA1678IDR operates over a wide supply range of ±2.25 V to ±18 V (or 4.5 V to 36 V) and is unity-gain stable, making it versatile for various audio applications. The device is available in several package types, including SOIC-8, VSSOP-8, and small SON-8 packages.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 2 | |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage Range | ±2.25 V to ±18 V (or 4.5 V to 36 V) | V |
| Quiescent Current per Channel | 2 mA (typical), 2.5 mA (maximum) | mA |
| Input Noise Density at 1 kHz | 4.5 nV/√Hz | nV/√Hz |
| Total Harmonic Distortion + Noise at 1 kHz | 0.0001% | % |
| Common-Mode Rejection Ratio (CMRR) | 110 dB (typical), 100 dB (minimum) | dB |
| Gain Bandwidth Product (GBW) | 16 MHz | MHz |
| Slew Rate | 9 V/µs | V/µs |
| Output Current | 50 mA (typical) | mA |
| Package Type | SOIC-8, VSSOP-8, small SON-8 |
Key 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 swing
- Wide supply range: ±2.25 V to ±18 V (or 4.5 V to 36 V)
- Available in single, dual, and quad-channel versions
Applications
The OPA1678IDR is suitable for a variety of audio applications due to its low noise, low distortion, and high dynamic range. These include:
- Audio preamplifiers and line drivers
- Professional audio equipment
- High-fidelity audio systems
- Active filters and equalizers
- Audio signal processing and conditioning circuits
Q & A
- What is the typical input noise density of the OPA1678IDR at 1 kHz?
4.5 nV/√Hz.
- What is the total harmonic distortion + noise (THD + N) of the OPA1678IDR at 1 kHz?
0.0001%.
- What is the common-mode rejection ratio (CMRR) of the OPA1678IDR?
110 dB (typical), 100 dB (minimum).
- What is the slew rate of the OPA1678IDR?
9 V/µs.
- What is the operating temperature range of the OPA1678IDR?
-40°C to 85°C.
- What are the available package types for the OPA1678IDR?
SOIC-8, VSSOP-8, and small SON-8.
- Is the OPA1678IDR unity-gain stable?
- What is the supply voltage range for the OPA1678IDR?
±2.25 V to ±18 V (or 4.5 V to 36 V).
- What is the quiescent current per channel for the OPA1678IDR?
2 mA (typical), 2.5 mA (maximum).
- Is the OPA1678IDR RoHS compliant?
