Multichannel Audio Coder Decoder 44-Pin PQFP Tray

The UDA1338H is a single-chip consisting of 4 plus 1 analog-to-digital converters and 6 digital-to-analog converters with signal processing features employing bitstream conversion techniques. The multichannel configuration makes the device eminently suitable for use in digital audio equipment which incorporates surround feature. The UDA1338H supports conventional 2 channels per line data transfer conformable to the I2S-bus format with word lengths of up to 24 bits, the MSB-justified format with word lengths of up to 24 bits and the LSB-justified format with word lengths of 16 bits, 20 bits and 24 bits, as well as 4 to 6 channels per line transfer mode. The device also supports a combination of the MSB-justified output format and the LSB-justified input format. The UDA1338H has special sound processing features in the Direct Stream Digital (DSD) playback mode, de-emphasis, volume and mute which can be controlled via the L3-bus or I²C-bus interface.

2.1 General

• 2.7 V to 3.6 V power supply
• 5 V tolerant digital inputs
• 24-bit data path
• Selectable control: via L3-bus or I²C-bus microcontroller interface
• Supports sample frequency ranges for:
  • Audio ADC: fs = 16 kHz to 100 kHz
  • Voice ADC: fs = 7 kHz to 50 kHz
  • Audio DAC: fs = 16 kHz to 200 kHz
• Separate power control for ADC and DAC
• ADC plus integrated high-pass filter to cancel DC offset
• Integrated digital filter plus DAC
• Slave mode only applications
• Easy application

Multiple format data interface

• Audio interface supports standard I2S-bus, MSB-justified, LSB-justified and two multichannel formats
• Voice interface supports I2S-bus and mono channel formats

Digital sound processing

• Control via L3-bus or I²C-bus:
• Channel independent digital logarithmic volume
• Digital de-emphasis for fs = 32 kHz, 44.1 kHz, 48 kHz or 96 kHz
• Soft or quick mute
• Output signal polarity control

Advanced audio configuration

• Inputs:
  • 4 single-ended audio inputs (2 × stereo) with programmable gain amplifiers
  • 1 single-ended voice input
• Outputs:
  • 6 differential audio outputs (3 × stereo)
• DSD mode to support stereo DSD playback
• High linearity, wide dynamic range and low distortion
• DAC digital filter with selectable sharp or soft roll-off