Overview
The OPA1679IPWR from Texas Instruments is a quad-channel, low-distortion audio operational amplifier designed to offer high system-level performance in various audio applications. This device is part of the OPA167x family, which includes single-channel (OPA1677), dual-channel (OPA1678), and quad-channel (OPA1679) configurations. The OPA1679IPWR is known for its low noise, low distortion, and high open-loop gain, making it ideal for applications requiring high audio signal fidelity.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Input Voltage Noise Density | 4.5 nV/√Hz | f = 1 kHz |
| Distortion | 0.0001% (–120 dB) | f = 1 kHz, RL = 600 Ω, VO = 3 VRMS |
| Open-Loop Gain | 114 dB | (V–) + 0.8 V ≤ VO ≤ (V+) – 0.8 V |
| Common-Mode Rejection Ratio (CMRR) | 110 dB | VS = ±2.25 V to ±18 V |
| Power Supply Rejection Ratio (PSRR) | 110 dB | VS = ±2.25 V to ±18 V |
| Supply Voltage Range | ±2.25 V to ±18 V (or 4.5 V to 36 V) | |
| Quiescent Current (per channel) | 2 mA | IO = 0 A, TA = –40°C to 125°C |
| Output Voltage Swing | (V–) + 0.8 V to (V+) – 0.8 V | RL = 2 kΩ |
| Gain-Bandwidth Product (GBW) | 16 MHz | G = 1 |
| Slew Rate | 9 V/µs | G = –1 |
Key Features
- Low Noise and Distortion: The OPA1679IPWR features a low input voltage noise density of 4.5 nV/√Hz at 1 kHz and a distortion of 0.0001% at 1 kHz, ensuring high audio signal fidelity.
- High Open-Loop Gain and CMRR: With an open-loop gain of 114 dB and a common-mode rejection ratio of 110 dB, this amplifier provides excellent dynamic behavior and stability.
- Rail-to-Rail Output Swing: The device offers a rail-to-rail output swing to within 800 mV with a 2-kΩ load, increasing headroom and maximizing dynamic range.
- Wide Supply Voltage Range: The OPA1679IPWR operates over a wide supply voltage range of ±2.25 V to ±18 V (or 4.5 V to 36 V), making it versatile for various power-supply constraints.
- Low Quiescent Current: Each channel consumes only 2 mA of quiescent current, which is beneficial for power-sensitive applications.
- Unity-Gain Stable: The amplifier is unity-gain stable and suitable for use in a wide range of load conditions.
Applications
- Professional Audio Equipment: Ideal for use in professional audio mixers, preamplifiers, and other high-fidelity audio equipment due to its low noise and distortion characteristics.
- Consumer Audio Products: Suitable for consumer audio products such as home theaters, soundbars, and high-end audio receivers.
- Medical and Industrial Equipment: Can be used in medical devices and industrial control systems where high signal integrity is required.
- Automotive Audio Systems: Applicable in automotive audio systems where low noise and high fidelity are essential.
Q & A
- What is the input voltage noise density of the OPA1679IPWR?
The input voltage noise density is 4.5 nV/√Hz at 1 kHz.
- What is the distortion level of the OPA1679IPWR at 1 kHz?
The distortion level is 0.0001% (–120 dB) at 1 kHz with RL = 600 Ω and VO = 3 VRMS.
- What is the open-loop gain of the OPA1679IPWR?
The open-loop gain is 114 dB.
- What is the common-mode rejection ratio (CMRR) of the OPA1679IPWR?
The CMRR is 110 dB.
- What is the supply voltage range for the OPA1679IPWR?
The supply voltage range is ±2.25 V to ±18 V (or 4.5 V to 36 V).
- How much quiescent current does each channel of the OPA1679IPWR consume?
Each channel consumes 2 mA of quiescent current.
- Is the OPA1679IPWR unity-gain stable?
Yes, the OPA1679IPWR is unity-gain stable.
- What is the gain-bandwidth product (GBW) of the OPA1679IPWR?
The GBW is 16 MHz at a gain of 1.
- What is the slew rate of the OPA1679IPWR?
The slew rate is 9 V/µs at a gain of –1.
- In what types of applications is the OPA1679IPWR commonly used?
The OPA1679IPWR is commonly used in professional and consumer audio equipment, medical devices, industrial control systems, and automotive audio systems.
