UDA1345TS: Economy audio CODEC ARCHIVED

Overview

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The UDA1345TS is a single-chip stereo Analog-to-Digital Converter (ADC) and Digital-to-Analog Converter (DAC) with signal processing features employing bitstream conversion techniques. The low power consumption and low voltage requirements make the device eminently suitable for use in low-voltage low-power portable digital audio equipment that incorporates recording and playback functions.

The UDA1345TS supports the I²S-bus data format with word lengths of up to 24 bits, the MSB justified data format with word lengths of up to 20 bits and the LSB justified serial data format with word lengths of 16, 18 and 20 bits.

The UDA1345TS also supports three combined data formats with MSB justified data output and LSB 16, 18 and 20 bits data input.

The UDA1345TS can be used either with static pin control or under L3 microcontroller interface. In L3 mode the UDA1345TS has basic sound features in playback mode such as de-emphasis, volume control and soft mute.

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Features

General

Low power consumption
2.4 to 3.6 V power supply range with 3.0 V typical
5 V tolerant TTL compatible digital inputs
256, 384 and 512f_s system clock
Supports sampling frequencies from 8 to 100 kHz
Noninverting ADC plus integrated high-pass filter to cancel DC offset
The ADC supports 2 V (RMS) input signals
Overload detector for easy record level control
Separate power control for ADC and DAC
Integrated digital interpolation filter plus noninverting DAC
Functions controllable either by L3 microcontroller interface or via static pins
The UDA1345TS is pin and function compatible with the UDA1344TS
Small package size (SSOP28)

Multiple format input interfaces

I²S-bus, MSB-justified up to 24 bits and LSB-justified 16, 18 and 20 bits format compatible
Three combined data formats with MSB data output and LSB 16, 18 and 20 bits data input
1f_s input and output format data rate

DAC digital sound processing

The sound processing features of the UDA1345TS can only be used in L3 microcontroller mode:

Digital dB-linear volume control (low microcontroller load) via L3 microcontroller with 1 dB steps
Digital de-emphasis for 32, 44.1 and 48 kHz
Soft mute via cosine roll-off (in 1024 samples)

Note: in contrast to the UDA1344TS, the UDA1345TS does not have bass-boost and treble

Advanced audio configuration

Stereo single-ended input configuration
Stereo line output (under microcontroller volume control), no post filter required
High linearity, dynamic range, and low distortion