2 ADC, 8 DAC,
96 kHz, 24-Bit ꢀ-ꢁ Codec
AD1835
FEATURES
APPLICATIONS
5 V Stereo Audio System with 3.3 V Tolerant
Digital Interface
DVD Video and Audio Players
Home Theater Systems
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
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
Automotive Audio Systems
Audio/Visual Receivers
Digital Audio Effects Processors
PRODUCT OVERVIEW
The AD1835 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.
On-Chip Volume Controls per Channel with
1024-Step Linear Scale
The AD1835 also contains an on-chip reference with a nominal
value of 2.25 V.
DAC and ADC Software Controllable Clickless Mutes
Digital De-emphasis Processing
Supports 256 ꢂ fS, 512 ꢂ fS, and 768 ꢂ fS 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
The AD1835 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 AD1835 can be configured
in left-justified, right-justified, I2S, or DSP compatible serial
modes. Control of the AD1835 is achieved by means of an
SPI compatible serial port. While the AD1835 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.
52-Lead MQFP Plastic Package
The AD1835 is available in a 52-lead MQFP package and is
specified for the industrial temperature range of –40ºC to +85ºC.
FUNCTIONAL BLOCK DIAGRAM
DVDD DVDD ODVDD ALRCLK ABCLK ASDATA CCLK CLATCH CIN COUT
MCLK
AVDD
PD/RST M/S
AVDD
DLRCLK
DBCLK
CLOCK
CONTROL PORT
OUTLP1
OUTLN1
OUTRP1
OUTRN1
VOLUME
VOLUME
SERIAL DATA
I/O PORT
DSDATA1
DSDATA2
DSDATA3
DSDATA4
ꢀ-ꢁ
DAC
DIGITAL
FILTER
OUTLP2
OUTLN2
OUTRP2
OUTRN2
VOLUME
VOLUME
ꢀ-ꢁ
DAC
DIGITAL
FILTER
ADCLP
ADCLN
OUTLP3
OUTLN3
OUTRP3
OUTRN3
ꢀ-ꢁ
ADC
DIGITAL
FILTER
VOLUME
VOLUME
ꢀ-ꢁ
DAC
DIGITAL
FILTER
OUTLP4
OUTLN4
OUTRP4
OUTRN4
ADCRP
ADCRN
ꢀ-ꢁ
ADC
DIGITAL
FILTER
VOLUME
VOLUME
ꢀ-ꢁ
DAC
DIGITAL
FILTER
FILTD
FILTR
AD1835
V
REF
REV. B
DGND DGND AGND AGND AGND AGND
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may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
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