2 ADC, 6 DAC,
96 kHz, 24-Bit ⌺-⌬ Codec
5 V Stereo Audio System with 3.3 V Tolerant
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
DACs: –95 dB THD + N, 108 dB SNR and
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
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
DVD Video and Audio Players
Home Theater Systems
Automotive Audio Systems
Digital Audio Effects Processors
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, I2S, 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.
FUNCTIONAL BLOCK DIAGRAM
DVDD DVDD ODVDD ALRCLK ABCLK ASDATA CCLK CLATCH CIN COUT MCLK PD/RST M/S AVDD AVDD
DGND DGND AGND AGND AGND AGND
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