AD1837A_15 Datasheet, PDF (1/24 Pages) Analog Devices – 2 ADC, 8 DAC, 96 kHz, 24-Bit Codec

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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
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, I²S Compatible, and DSP Serial Port
Modes
TDM Interface Mode Supports 8 In/8 Out Using a
Single SHARC^® SPORT
52-Lead MQFP Plastic Package
2 ADC, 8 DAC,
96 kHz, 24-Bit ⌺-⌬ Codec
AD1837A
APPLICATIONS
DVD Video and Audio Players
Home Theater Systems
Automotive Audio Systems
Audio/Visual Receivers
Digital Audio Effects Processors
GENERAL DESCRIPTION
The AD1837A 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 inde-
pendent volume control and clickless mute functions. The ADC
comprises two 24-bit conversion channels with multibit S-D
modulators and decimation filters.
The AD1837A also contains an on-chip reference with a nominal
value of 2.25 V.
The AD1837A contains a flexible serial interface that allows for
glueless connection to a variety of DSP chips, AES/EBU receivers,
and sample rate converters. The AD1837A can be configured in
left-justified, right-justified, I²S, or DSP compatible serial modes.
Control of the AD1837A is achieved by means of an SPI compat-
ible serial port. While the AD1837A can be operated from a single
5 V supply, it also features a separate supply pin for its digital inter-
face, which allows the device to be interfaced to other devices using
3.3 V power supplies.
The AD1837A is available in a 52-lead MQFP package and is speci-
fied for the industrial temperature range of –40ºC to +85ºC.
FUNCTIONAL BLOCK DIAGRAM
DVDD DVDD ODVDD ALRCLK ABCLK ASDATA CCLK CLATCH CIN COUT MCLK PD/RST M/S AVDD AVDD
REV. A
DLRCLK
DBCLK
DSDATA1
DSDATA2
DSDATA3
DSDATA4
ADCLP
ADCLN
ADCRP
ADCRN
⌺-⌬
ADC
⌺-⌬
ADC
AD1837A
SERIAL DATA
I/O PORT
DIGITAL
FILTER
DIGITAL
FILTER
CONTROL PORT
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
CLOCK
DIGITAL
FILTER
DIGITAL
FILTER
DIGITAL
FILTER
DIGITAL
FILTER
DGND DGND AGND AGND AGND AGND
⌺-⌬
DAC
⌺-⌬
DAC
⌺-⌬
DAC
⌺-⌬
DAC
V_REF
OUTL1
OUTR1
OUTL2
OUTR2
OUTL3
OUTR3
OUTL4
OUTR4
FILTD
FILTR
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