Overview
The OPA1688IDRGT from Texas Instruments is a high-voltage, single-supply, low-noise audio operational amplifier. It is part of the OPA16xx family, offering a range of bandwidth, noise, and power options to cater to various audio applications. This device is notable for its wide supply voltage range, from 4.5V to 36V (or ±2.25V to ±18V), and its ability to maintain stability into large capacitive loads without the need for a series output resistor. The OPA1688 is particularly suited for applications requiring high output current drive capability, low offset and drift, and excellent output stage linearity, making it an ideal choice for driving headphones and other audio equipment.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Gain Bandwidth Product | 10 MHz | |
| Slew Rate | 8 V/μs | |
| Power Supply Voltage Range | 4.5V to 36V (or ±2.25V to ±18V) | |
| Quiescent Current | 1.6 mA | |
| Input Voltage Noise | 8 nV/√Hz (at 1 kHz) | |
| Input Current Noise | 1.8 fA/√Hz | |
| Input Offset Voltage | ±0.25 mV (typical) | |
| Input Bias Current | ±10 pA | |
| Input Voltage Range | 100 mV below V- to 2 V below V+ | |
| Operating Temperature | -40°C to 85°C | |
| Package Type | WSON8 |
Key Features
- Wide Supply Voltage Range: Operates from 4.5V to 36V (or ±2.25V to ±18V), making it versatile for various power supply configurations.
- High Output Current Drive Capability: Capable of driving large capacitive loads without the need for a series output resistor.
- Low Noise and Distortion: Features low input voltage noise (8 nV/√Hz) and high output stage linearity, making it suitable for high-quality audio applications.
- EMI Filtering: Built-in EMI filtering to reject interference in the GHz cell phone bands, reducing the impact of cell phone interference.
- Low Offset and Drift: Offers low input offset voltage (±0.25 mV typical) and low drift, ensuring stable operation over temperature changes.
- Rail-to-Rail Output: Provides rail-to-rail output capability, allowing the output to swing close to the supply rails.
Applications
- Headphone Amplifiers: Ideal for driving headphones due to its high output current drive capability and low distortion.
- Audio Equipment: Suitable for use in various audio equipment such as preamplifiers, line drivers, and active filters.
- Professional Audio Systems: Can be used in professional audio systems requiring high fidelity and low noise.
- Consumer Electronics: Applicable in consumer electronics like home audio systems, soundbars, and other audio devices.
Q & A
- What is the gain bandwidth product of the OPA1688?
The gain bandwidth product of the OPA1688 is 10 MHz.
- What is the slew rate of the OPA1688?
The slew rate of the OPA1688 is 8 V/μs.
- What is the power supply voltage range for the OPA1688?
The OPA1688 operates on supplies ranging from 4.5 V to 36 V (or ±2.25 V to ±18 V).
- What is the quiescent current of the OPA1688?
The quiescent current of the OPA1688 is 1.6 mA.
- What is the input voltage noise of the OPA1688?
The input voltage noise of the OPA1688 is 8 nV/√Hz at 1 kHz.
- Does the OPA1688 have built-in EMI filtering?
Yes, the OPA1688 has built-in EMI filtering to reject interference in the GHz cell phone bands.
- What is the operating temperature range for the OPA1688?
The operating temperature range for the OPA1688 is -40°C to 85°C.
- What package types are available for the OPA1688?
The OPA1688 is available in a WSON8 package.
- Is the OPA1688 suitable for driving headphones?
Yes, the OPA1688 is particularly suited for driving headphones due to its high output current drive capability and low distortion.
- Does the OPA1688 require a series output resistor for stability?
No, the OPA1688 does not require a series output resistor for stability into large capacitive loads.
