2 ADC, 6 DAC,
96 kHz, 24-Bit Sigma-Delta Codec

AD1839A


Rev. B
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Tel: 781.329.4700 www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
FEATURES
5 V stereo audio system with 3.3 V tolerant digital interface
Supports up to 96 kHz sample rates
192 kHz sample rate available on 1 DAC
Supports 16-/20-/24-bit word lengths
Multibit Σ-∆ modulators with perfect differential linearity
restoration for reduced idle tones and noise floor
Data-directed scrambling DACs—least sensitive to jitter
Single-ended output
ADCs: −95 dB THD + N, 105 dB SNR and dynamic range
DACs: −92 dB THD + N, 108 dB SNR and dynamic range
On-chip volume controls per channel with 1024-step linear
scale
DAC and ADC software controllable clickless mutes
Digital de-emphasis processing
Supports 256 × fS, 512 × fS, and 768 × fS master mode clocks
Power-down mode and soft power-down mode
Flexible serial data port with right-justified, left-justified,
I
2
S compatible, and DSP serial modes
TDM interface mode supports 8-in/8-out operation using a
single SHARC® SPORT
52-lead MQFP plastic package

APPLICATIONS
DVD video and audio players
Home theater systems
Automotive audio systems
Audio/visual receivers
Digital audio effects process
GENERAL DESCRIPTION
The AD1839A is a high performance single-chip codec that
features three stereo DACs and one stereo ADC. Each DAC
comprises a high performance digital interpolation filter, a
multibit Σ-∆ modulator featuring Analog Devices’ patented
technology, and a continuous-time voltage-out analog section.
Each DAC has independent volume control and clickless mute
functions. The ADC comprises two 24-bit conversion channels
with multibit Σ-∆ modulators and decimation filters.
The AD1839A also contains an on-chip reference with a
nominal value of 2.25 V.
The AD1839A contains a flexible serial interface that allows
glueless connection to a variety of DSP chips, AES/EBU
receivers, and sample rate converters. The AD1839A can be
configured in left-justified, right-justified, I
2
S, or DSP compati-
ble serial modes. Control of the AD1839A is achieved by means
of an SPI® compatible serial port. While the AD1839A can be
operated from a single 5 V supply, it also features a separate
supply pin for its digital interface that allows the device to be
interfaced to other devices using 3.3 V power supplies. The
AD1839A is available in a 52-lead MQFP package and is
specified for the −40°C to +85°C industrial temperature range.

FUNCTIONAL BLOCK DIAGRAM
OUTL1
CONTROL PORT CLOCK
FILTD
FILTR
ADCLP
ADCLN
ADCRP
ADCRN
DLRCLK
DBCLK
DSDATA1
DSDATA2
DSDATA3
DAUXDATA
MCLKODVDDDVDD AVDDAVDDDVDD
AGNDDGND
CINCLATCHCCLK COUT
DIGITAL
FILTER
DIGITAL
FILTER
M/S
VOLUME
SERIAL DATA
I/O PORT
DIGITAL
FILTER
V
REF
OUTR1VOLUME
OUTL2VOLUME
DIGITAL
FILTER
OUTR2VOLUME
OUTL3VOLUME
DIGITAL
FILTER
OUTR3VOLUME
Σ-∆
ADC
AAUXDATA3
AD1839A
ASDATAABCLKALRCLK
AGND AGND AGNDDGND 03627-B
-
001
Σ-∆
ADC
Σ-∆
DAC
Σ-∆
DAC
Σ-∆
DAC
PD/RST

Figure 1.