2 ADC, 6 DAC, a 96 kHz, 24-Bit - Codec AD1838A FEATURES APPLICATIONS 5 V Stereo Audio System with 3.3 V Tolerant DVD Video and Audio Players Digital Interface Home Theater Systems Supports up to 96 kHz Sample Rates Automotive Audio Systems 192 kHz Sample Rate Available on 1 DAC Audio/Visual Receivers Supports 16-, 20-, 24-Bit Word Lengths Digital Audio Effects Processors Multibit - Modulators with Perfect Differential Linearity Restoration for GENERAL DESCRIPTION Reduced Idle Tones and Noise Floor The AD1838A is a high performance single-chip codec featuring Data Directed Scrambling DACsLeast three stereo DACs and one stereo ADC. Each DAC comprises a Sensitive to Jitter high performance digital interpolation filter, a multibit - modulator featuring Analog Devices patented technology, Differential Output for Optimum Performance and a continuous-time voltage out analog section. Each DAC ADCs: 95 dB THD + N, 105 dB SNR and has independent volume control and clickless mute functions. Dynamic Range The ADC comprises two 24-bit conversion channels with DACs: 95 dB THD + N, 108 dB SNR and multibit - modulators and decimation filters. Dynamic Range On-Chip Volume Controls per Channel with The AD1838A also contains an on-chip reference with a nomi- 1024 Step Linear Scale nal value of 2.25 V. DAC and ADC Software Controllable Clickless Mutes The AD1838A contains a flexible serial interface that allows Digital De-emphasis Processing glueless connection to a variety of DSP chips, AES/EBU Supports 256 f , 512 f , and 768 f Master S S S receivers, and sample rate converters. The AD1838A can be 2 Mode Clocks configured in left-justified, right-justified, I S, or DSP com- Power-Down Mode Plus Soft Power-Down Mode patible serial modes. Control of the AD1838A is achieved by Flexible Serial Data Port with Right-Justified, Left- means of an SPI compatible serial port. While the AD1838A 2 Justified, I S Compatible, and DSP Serial Port Modes can be operated from a single 5 V supply, it also features a sepa- TDM Interface Mode Supports 8 In/8 Out Using a rate supply pin for its digital interface that allows the device to be interfaced to other devices using 3.3 V power supplies. Single SHARC SPORT 52-Lead MQFP Plastic Package The AD1838A is available in a 52-lead MQFP package and is specified for the industrial temperature range of 40C to +85C. FUNCTIONAL BLOCK DIAGRAM DVDD DVDD ODVDD ALRCLK ABCLK ASDATA CCLK CLATCH CIN COUT MCLK AVDD PD/RST M/S AVDD AAUXDATA3 CLOCK CONTROL PORT DLRCLK OUTLP1 VOLUME DBCLK SERIAL DATA OUTLN1 DIGITAL - I/O PORT FILTER DAC OUTRP1 DSDATA1 VOLUME OUTRN1 DSDATA2 OUTLP2 VOLUME OUTLN2 DIGITAL - DSDATA3 DAC OUTRP2 FILTER VOLUME DAUXDATA OUTRN2 OUTLP3 VOLUME - OUTLN3 DIGITAL ADCLP DAC OUTRP3 FILTER DIGITAL VOLUME OUTRN3 ADC FILTER ADCLN FILTD V ADCRP REF FILTR DIGITAL AD1838A FILTER ADC ADCRN DGND DGND AGND AGND AGND AGND REV. A Information furnished by Analog Devices is believed to be accurate and 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and Tel: 781/329-4700 www.analog.com registered trademarks are the property of their respective owners. Fax: 781/326-8703 2004 Analog Devices, Inc. All rights reserved. OBSOLETESPECIFICATIONS AD1838A TEST CONDITIONS Supply Voltages (AVDD, DVDD) 5.0 V Ambient Temperature 25C Input Clock 12.288 MHz (256 f Mode) S DAC Input Signal 1.0078125 kHz, 0 dBFS (Full Scale) ADC Input Signal 1.0078125 kHz, 1 dBFS Input Sample Rate (f ) 48 kHz S Measurement Bandwidth 20 Hz to 20 kHz Word Width 24 Bits Load Capacitance 100 pF Load Impedance 47 k Performance of all channels is identical (except for the Interchannel Gain Mismatch and Interchannel Phase Deviation speci- fications). Parameter Min Typ Max Unit ANALOG-TO-DIGITAL CONVERTERS ADC Resolution 24 Bits Dynamic Range (20 Hz to 20 kHz, 60 dB Input) No Filter 100 103 dB With A-Weighted Filter 105 dB Total Harmonic Distortion + Noise (THD + N) 48 kHz 95 88.5 dB 96 kHz 95 87.5 dB Interchannel Isolation 100 dB Interchannel Gain Mismatch 0.025 dB Analog Inputs Differential Input Range ( Full Scale) 2.828 +2.828 V Common-Mode Input Voltage 2.25 V Input Impedance 4 k Input Capacitance 15 pF V 2.25 V REF DC Accuracy Gain Error 5% Gain Drift 35 ppm/C DIGITAL-TO-ANALOG CONVERTERS DAC Resolution 24 Bits Dynamic Range (20 Hz to 20 kHz, 60 dBFS Input) No Filter 103 105 dB With A-Weighted Filter (48 kHz and 96 kHz) 105 108 dB Total Harmonic Distortion + Noise (48 kHz and 96 kHz) 95 90 dB Interchannel Isolation 110 dB DC Accuracy Gain Error 4.0 % Interchannel Gain Mismatch 0.025 dB Gain Drift 200 ppm/C Interchannel Phase Deviation 0.1 Degrees Volume Control Step Size (1023 Linear Steps) 0.098 % Volume Control Range (Maximum Attenuation) 60 dB Mute Attenuation 100 dB De-emphasis Gain Error 0.1 dB Full-Scale Output Voltage at Each Pin (Single-Ended) 1.0 (2.8) V rms (V p-p) Output Resistance at Each Pin 180 Common-Mode Output Voltage 2.25 V ADC DECIMATION FILTER, 48 kHz* Pass Band 21.77 kHz Pass-Band Ripple 0.01 dB Stop Band 26.23 kHz Stop-Band Attenuation 120 dB Group Delay 910 s REV. A 2 OBSOLETE