Overview
The AD73322LARZ, produced by Analog Devices Inc., is a dual front-end processor designed for general-purpose applications, including speech and telephony. This device features two 16-bit analog-to-digital (A/D) conversion channels and two 16-bit digital-to-analog (D/A) conversion channels. It is particularly suited for applications requiring high-quality analog input/output processing, such as speech enhancement, recognition, and synthesis.
The AD73322LARZ operates on a single 3 V supply and is available in a 28-lead SOIC package. It includes programmable input/output gains, an on-chip reference voltage, and a flexible serial port (SPORT) for easy interfacing with industry-standard DSP engines.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| A/D and D/A Converters | 2 channels each | - | 16-bit resolution |
| ADC SNR | 75 dB | - | Over voiceband signal bandwidth |
| DAC SNR | 70 dB | - | Over voiceband signal bandwidth |
| Maximum Sample Rate | 64 ksps | - | Programmable: 64, 32, 16, 8 ksps |
| Crosstalk | -90 dB | - | - |
| Input/Output Gain | Programmable | - | ADC: 38 dB, DAC: 21 dB |
| Group Delay | 25 µs (ADC), 50 µs (DAC) | - | - |
| Supply Voltage | 2.7 V to 5.5 V | V | L version operates from 3 V only |
| Package | 28-lead SOIC | - | - |
Key Features
- Two 16-bit A/D and two 16-bit D/A conversion channels
- Programmable input/output sample rates and gains
- Low group delay: 25 µs per ADC channel, 50 µs per DAC channel
- Flexible serial port (SPORT) for interfacing with DSP engines
- On-chip reference voltage for single-supply operation
- Input-to-output gain network in both analog and digital domains
- Single 3 V supply operation for the L version
Applications
- General-purpose analog I/O
- Speech processing
- Cordless and personal communications
- Telephony
- Active control of sound and vibration
- Data communications
- Wireless local loop
Q & A
- What is the primary function of the AD73322LARZ?
The AD73322LARZ is a dual front-end processor for general-purpose applications, including speech and telephony, featuring two 16-bit A/D and two 16-bit D/A conversion channels.
- What are the key specifications of the A/D and D/A converters?
The A/D and D/A converters are 16-bit resolution, with an ADC SNR of 75 dB and a DAC SNR of 70 dB over voiceband signal bandwidth.
- What are the programmable sample rates of the AD73322LARZ?
The sample rates are programmable with four separate settings: 64 ksps, 32 ksps, 16 ksps, and 8 ksps.
- What is the group delay of the AD73322LARZ?
The group delay is 25 µs per ADC channel and 50 µs per DAC channel.
- What is the supply voltage range for the AD73322LARZ?
The supply voltage range is 2.7 V to 5.5 V, but the L version operates from 3 V only.
- What package options are available for the AD73322LARZ?
The device is available in a 28-lead SOIC package.
- What is the purpose of the on-chip reference voltage?
The on-chip reference voltage allows for single-supply operation and is programmable to accommodate either 3 V or 5 V operation.
- How does the AD73322LARZ interface with DSP engines?
The device features a flexible serial port (SPORT) that allows easy interfacing with industry-standard DSP engines, with programmable transfer rates to accommodate both fast and slow DSP engines.
- What are some common applications of the AD73322LARZ?
Common applications include general-purpose analog I/O, speech processing, cordless and personal communications, telephony, active control of sound and vibration, data communications, and wireless local loop.
- What is the significance of the input-to-output gain network in the AD73322LARZ?
The input-to-output gain network in both the analog and digital domains can be used for impedance matching or scaling when interfacing to Subscriber Line Interface circuits (SLICs).
