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Tel: 781/329-4700
Fax: 781/326-8703
AD1837
2 ADC, 8 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 One 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
Single-Ended Outputs
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 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
FUNCTIONAL BLOCK DIAGRAM
OUTL1
CONTROL PORT
CLOCK
FILTD
FILTR
ADCLP
ADCLN
ADCRP
ADCRN
DLRCLK
DBCLK
DSDATA1
DSDATA2
DSDATA3
DSDATA4
MCLK
ASDATA
ABCLK
ALRCLK
ODVDD
DVDD
AVDD
AVDD
DVDD
AGND
AGND
AGND
AGND
DGND
DGND
CIN
CLATCH
CCLK
COUT
DIGITAL
FILTER
PD
/
RST M
/S
-
ADC
VOLUME
SERIAL DATA
I/O PORT
DIGITAL
FILTER
-
DAC
V
REF
OUTR1
OUTL2
VOLUME
VOLUME
DIGITAL
FILTER
-
DAC
OUTR2
OUTL3
VOLUME
VOLUME
DIGITAL
FILTER
-
DAC
OUTR3
OUTL4
VOLUME
VOLUME
DIGITAL
FILTER
-
DAC
OUTR4
VOLUME
DIGITAL
FILTER
-
ADC
AD1837
APPLICATIONS
DVD Video and Audio Players
Home Theater Systems
Automotive Audio Systems
Audio/Visual Receivers
Digital Audio Effects Processors
PRODUCT OVERVIEW
The AD1837 is a high performance single-chip codec featuring
four 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 AD1837 also contains an on-chip reference with a nominal
value of 2.25 V.
The AD1837 contains a flexible serial interface that allows for
glueless connection to a variety of DSP chips, AES/EBU receiv-
ers, and sample rate converters. The AD1837 can be configured
in left-justified, right-justified, I
2
S, or DSP compatible serial
modes. Control of the AD1837 is achieved by means of an SPI
compatible serial port. While the AD1837 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 AD1837 is available in a 52-lead MQFP package and is
specified for the industrial temperature range of –40oC to +85oC.
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