REV. A
a
AD1838A
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reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
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2 ADC, 6 DAC,
96 kHz, 24-Bit - Codec
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 - Modulators with
Perfect Differential Linearity Restoration for
Reduced Idle Tones and Noise Floor
Data Directed Scrambling DACs—Least
Sensitive to Jitter
Differential Output for Optimum Performance
ADCs: –95 dB THD + N, 105 dB SNR and
Dynamic Range
DACs: –95 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 f
S
, 512 f
S
, and 768 f
S
Master
Mode Clocks
Power-Down Mode Plus Soft Power-Down Mode
Flexible Serial Data Port with Right-Justified, Left-
Justified, I
2
S Compatible, and DSP Serial Port Modes
TDM Interface Mode Supports 8 In/8 Out 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 Processors
FUNCTIONAL BLOCK DIAGRAM
ADCLP
ADCLN
ADCRP
ADCRN
DLRCLK
DBCLK
DSDATA1
DSDATA2
DSDATA3
DAUXDATA
AAUXDATA 3
OUTLP1
OUTLN1
CONTROL PORT
CLOCK
FILTD
FILTR
MCLKASDATAABCLKALRCLKODVDDDVDD
AV DD
AV DD
DVDD
AGND AGNDAGNDAGNDDGNDDGND
CINCLATCHCCLK COUT
DIGITAL
FILTER
PD/RST M/S
−∆
ADC
VOLUME
SERIAL DATA
I/O PORT
DIGITAL
FILTER
-
DAC
V
REF
OUTRP1
OUTRN1
VOLUME
OUTLP2
OUTLN2
VOLUME
DIGITAL
FILTER
-
DAC
OUTRP2
OUTRN2
VOLUME
OUTLP3
OUTLN3
VOLUME
DIGITAL
FILTER
-
DAC
OUTRP3
OUTRN3
VOLUME
DIGITAL
FILTER
−∆
ADC
AD1838A
GENERAL DESCRIPTION
The AD1838A is a high performance single-chip codec featuring
three stereo DACs and one stereo ADC. Each DAC comprises a
high performance digital interpolation filter, a multibit -
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 - modulators and decimation filters.
The AD1838A also contains an on-chip reference with a nomi-
nal value of 2.25 V.
The AD1838A contains a flexible serial interface that allows
glueless connection to a variety of DSP chips, AES/EBU
receivers, and sample rate converters. The AD1838A can be
configured in left-justified, right-justified, I
2
S, or DSP com-
patible serial modes. Control of the AD1838A is achieved by
means of an SPI
®
compatible serial port. While the AD1838A
can be operated from a single 5 V supply, it also features a sepa-
rate supply pin for its digital interface that allows the device to
be interfaced to other devices using 3.3 V power supplies.
The AD1838A is available in a 52-lead MQFP package and is
specified for the industrial temperature range of –40ºC to +85ºC.
