EVAL-AD1896EB Datasheet, PDF (6/28 Pages) Analog Devices – AD1896 7.75:1 to 1:8, 192 kHz Stereo ASRC Evaluation Board

EVAL-AD1896EB
DEFAULT SETUP
f_{S_IN}
f_{S_OUT}
SET EXTERNALLY 44.1kHz
256f_S
AD1852 DAC
U12
MCLK_I
SCLK_I
LRCLK_I
SDATA_I
LEFT OUT
RIGHT OUT
INPUT DATA:
DIRECT DIGITAL INPUT HEADER
HDR3 (DDI)
SCLK
LRCLK
SDATA
AD1896
U13
SCLK_I SCLK_O
LRCLK_I LRCLK_O
SDATA_I SDATA_O
MCLK_I MCLK_O
OUTPUT DATA:
DIRECT DIGITAL OUTPUT HEADER
HDR5 (DDO)
SCLK
LRCLK
SDATA
1 23
JUMPER JP4 33.868MHz CRYSTAL
128f_S
CS8404 DIT
U6
SDATA_I
LRCLK_I
SCLK_I
MCLK_I
SPDIF OUTPUT
CLOCK DIVIDER
256f_S
128f_S
Figure 3. Default Setup (Refer to Figure 5 for Detailed Setup)
TYPICAL PERFORMANCE
Typical performance of the AD1896 for 44.1 kHz:48 kHz (asynchronous) sample rate is listed below.
1. DNR, No Filter
2. DNR, A-Weighted
3. THD+N, No Filter
4. Frequency Response
–139 dBFS, 20 Hz to 20 kHz (–60 dBFS)
–142 dBFS, 20 Hz to 20 kHz (–60 dBFS)
–120 dBFS, 20 Hz to 20 kHz (0 dBFS)
± 0.015 dB, 20 Hz to 20 kHz (0 dBFS)
Table IX. MCLK_I Frequencies for Common Sample Rates in Master Mode
Sample Rate (kHz)
44.100
48.000
96.000
MCLK_I Frequency (MHz)
256 ؋ f_S
512 ؋ f_S
768 ؋ f_S
11.289600
12.288000
24.576000
22.579200
24.576000
33.868800
EXTERNAL 192 kHz CLOCK GENERATOR CIRCUIT
An external circuit can be used to generate the 192 kHz clock
signals (SCLK, LRCLK) using on-board 128 Ï« f_S clock oscilla-
tor (U15) running at 24.576 MHz. Please refer to Figure 4 for
the schematic and instructions on how to connect the exter-
nal circuit to the AD1896EB. In general, external SCLK and
LRCLK can be used for converting the audio input data to 192 kHz
rate by connecting SCLK to SCLK_O (DDO_SCLK_O,
HDR5 on the AD1896EB) and LRCLK to LRCLK_O
(DDO_LRCLK_O, HDR5 on the AD1896EB). On-board SPDIF
transmitter CS8404 (U6) does not support sample rates above
96 kHz.
ATTACHMENTS
Appendix A
1. External 192 kHz Clock Generator Circuit
2. AD1896 Evaluation Board Block Diagram, Schematics, and
Layout Plots
3. Bill of Materials
4. PLD Code
FURTHER INFORMATION
Ordering Information
Order number is EVAL-AD1896EB
For Application Questions or Technical Support
Contact Analog Devices’ Central Applications Department at
1-781-937-1428 for assistance.
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