EVAL-AD1852EB Datasheet, PDF (4/14 Pages) Analog Devices – 24-Bit Stereo DAC Evaluation Board

EVAL-AD1852EB
• U8 (ADM811TART) is a RESET generator that provides
a debounced 200 ms reset signal from the push button (S3)
or on power up. The reset is active if the 5 V supply drops
below 3 V.
• U7 (AD3303-5.0) is a low noise 5 V dc regulator for the ana-
log section of the AD1852.
• U9 (OP275) is a low noise and distortion, audio op amp. U9
provides differential-to-single-ended conversion and a low-
pass anti-image filter. A third order low-pass Bessel filter
response is implemented with a –3 dB corner frequency of
100 kHz and a 60 dB/decade roll-off. This type of filter is
characterized by a linear phase response and fast transient
response without overshoot.
• U10 (74HC00) is used to provide a reset code to the digital
interface receiver (U2), pins M0–3, at power up and also sends
the correct interface code to ensure the digital output for-
mat matches the input of the DAC.
• U11 (74HC00) is used to select the correct master clock
source for the DAC when it is switched between the SPDIF
receiver (U2) and the Ext Data Interface (J2). A discrete logic
gate is used for this function, because of the excessive jitter
that modulates high-frequency clock signals when they are
handled by PLDs.
PERFORMANCE SPECIFICATIONS
Typical performance, for a sample rate of 48 kHz, is tabulated
below.
1. SNR, A-Weighted
2. DNR, A-Weighted
3. THD+N
4. Frequency Response
5. Noise Floor
6. Full-Scale Audio Output
–114 dBFS ± 1 dB
–114 dBFS ± 1 dB
–102 dBFS ± 2 dB
± 0.2 dB, 10 Hz to 20 kHz
–145 dBFS
2 V rms
ATTACHMENTS
The following is included for your convenience.
• Appendix A: ABEL Source Code for Vantis MACH4-64/32
CPLD.
• Appendix B: Set of Schematics, Figures 1 and 2.
• Appendix C: PCB plots showing the silkscreen layer, top
signal layer, ground planes, power planes, and the bottom
signal layer, Figures 3–7.
FURTHER INFORMATION
Ordering information: order number is EVAL-AD1852EB.
For application questions, please contact our Central Applica-
tions Department at 1-781-937-1428 for assistance.
–4–
REV. 0