Overview
The OPA1688 is a 36-V, single-supply, low-noise SoundPlus™ audio operational amplifier produced by Texas Instruments. This device is designed to operate on a wide supply range from 4.5 V (±2.25 V) to 36 V (±18 V), making it versatile for various applications. The OPA1688 is known for its low offset voltage, low offset drift, and low quiescent current, along with its wide bandwidth and high output current drive capability. It is available in industry-standard SOIC-8 and microWSON-8 packages.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 4.5 V to 36 V, ±2.25 V to ±18 V | V |
| Offset Voltage | ±0.25 mV | mV |
| Offset Drift | ±0.5 µV/°C | µV/°C |
| Gain Bandwidth Product | 10 MHz | MHz |
| Input Bias Current | ±10 pA | pA |
| Quiescent Current per Amplifier | 1.6 mA | mA |
| Voltage Noise Density | 8 nV/√Hz | nV/√Hz |
| Common-Mode Rejection Ratio | 120 dB | dB |
| Operating Temperature Range | –40°C to +85°C | °C |
| Package | SOIC-8, microWSON-8 |
Key Features
- Low total harmonic distortion + noise (THD+N): –109 dB at 50 mW, 32 Ω, 1 kHz
- Wide supply range: 4.5 V to 36 V, ±2.25 V to ±18 V
- Low offset voltage and drift: ±0.25 mV and ±0.5 µV/°C respectively
- High gain bandwidth product: 10 MHz
- Low input bias current: ±10 pA
- Low quiescent current: 1.6 mA per amplifier
- Low noise: 8 nV/√Hz
- EMI- and RFI-filtered inputs
- Rail-to-rail output
- High common-mode rejection ratio: 120 dB
- Internal phase-reversal protection
Applications
The OPA1688 is suitable for a variety of applications due to its high performance and versatility. Some key applications include:
- Headphone amplifier circuits: Benefiting from its low noise, low distortion, and high output current drive capability.
- Audio equipment: Such as professional audio mixers, audio interfaces, and high-fidelity audio systems.
- Industrial and medical devices: Where high accuracy and reliability are crucial.
- Automotive audio systems: Where the device's wide supply range and robust performance are advantageous.
Q & A
- What is the supply voltage range of the OPA1688?
The OPA1688 operates on a supply voltage range from 4.5 V (±2.25 V) to 36 V (±18 V).
- What is the offset voltage of the OPA1688?
The offset voltage of the OPA1688 is ±0.25 mV.
- What is the gain bandwidth product of the OPA1688?
The gain bandwidth product of the OPA1688 is 10 MHz.
- Does the OPA1688 have phase-reversal protection?
- What are the package options for the OPA1688?
The OPA1688 is available in SOIC-8 and microWSON-8 packages.
- What is the common-mode rejection ratio of the OPA1688?
The common-mode rejection ratio of the OPA1688 is up to 120 dB.
- What is the quiescent current per amplifier for the OPA1688?
The quiescent current per amplifier for the OPA1688 is 1.6 mA.
- Is the OPA1688 EMI- and RFI-filtered?
- What is the operating temperature range of the OPA1688?
The operating temperature range of the OPA1688 is –40°C to +85°C.
- What are some typical applications of the OPA1688?
The OPA1688 is typically used in headphone amplifier circuits, audio equipment, industrial and medical devices, and automotive audio systems.
