Overview
The PGA2500IDBR, produced by Texas Instruments, is a digitally controlled, analog microphone preamplifier. It is designed to serve as a front end for high-performance audio analog-to-digital (A/D) converters. The PGA2500 features a fully differential input-to-output architecture, which ensures low noise and a wide dynamic range. This preamplifier is capable of amplifying the output of both dynamic and condenser microphones and is optimized for use in various audio applications requiring precise gain control and minimal distortion.
Key Specifications
| Specification | Value |
|---|---|
| Package | 28-SSOP (0.209", 5.30mm Width) |
| Pins | 28 |
| Operating Temperature Range (°C) | -40 to 85 |
| Voltage - Supply | ±4.75 V ~ 5.25 V |
| Gain Range | 10dB to 65dB, 1dB per step |
| Unity Gain Setting | Via serial port or dedicated control pin |
| Equivalent Noise with Zs = 150 and Gain = 30dB | 128dBu |
| Total Harmonic Distortion plus Noise (THD+N) with Gain = 30dB | 0.0004% |
| Serial Control Port Interface | Four-wire, supports daisy-chaining |
Key Features
- Fully differential input-to-output architecture
- Digitally controlled gain using a serial port interface with a gain range of 10dB to 65dB in 1dB steps
- Unity (0dB) gain setting via serial port or dedicated control pin
- Low noise and wide dynamic range
- Integrated DC servo to minimize output offset voltage
- Common-mode servo to improve common-mode rejection ratio (CMRR)
- Four-wire serial control port interface supporting daisy-chaining of multiple PGA2500 devices
- Dedicated input pin for selecting unity gain
- Overload output pin provides clipping indication
- Four general-purpose digital output pins
Applications
- Microphone preamplifiers and mixers
- Digital mixers and recorders
Q & A
- What is the PGA2500IDBR used for?
The PGA2500IDBR is used as a front end for high-performance audio analog-to-digital (A/D) converters, amplifying the output of dynamic and condenser microphones.
- What is the gain range of the PGA2500IDBR?
The gain range is from 10dB to 65dB, adjustable in 1dB steps.
- How is the gain controlled in the PGA2500IDBR?
The gain is controlled using a four-wire serial port interface with a 16-bit control word.
- What is the purpose of the DC servo in the PGA2500IDBR?
The DC servo minimizes the DC offset voltage present at the analog outputs.
- Can multiple PGA2500IDBR devices be daisy-chained?
- What is the operating temperature range of the PGA2500IDBR?
The operating temperature range is -40°C to 85°C.
- What type of power supply does the PGA2500IDBR require?
The PGA2500IDBR requires ±5V power supplies.
- In what package is the PGA2500IDBR available?
The PGA2500IDBR is available in a 28-SSOP package.
- What are some common applications of the PGA2500IDBR?
Common applications include microphone preamplifiers, mixers, and digital recorders.
- How does the PGA2500IDBR minimize audible artifacts during gain switching?
The PGA2500IDBR uses zero crossing detection to minimize audible artifacts when gain switching.
