EVAL-AD1953EB Analog Devices Inc, EVAL-AD1953EB Datasheet - Page 4

• Manufacturer Part Number: EVAL-AD1953EB
• Description: BOARD EVAL FOR AD1953
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD1953EB

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

EVAL-AD1953EB
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frame clock LRCLK, and the serial bit clock BCLK, and
outputs the S/PDIF signal to the TOSLINK transmitter and
the RCA output jack.
U5 (TOTX173) is the Toshiba digital audio optical transmitter.
It creates a visible red S/PDIF modulated signal from the
standard TTL digital signal output of the digital audio
transmitter (U4).
U6 (SC937-02) is a digital audio transformer with low jitter
and high CMRR that provides buffering between the evalu-
ation board and the external circuit, preventing ground loops.
U7 (AD1953) is the SigmaDSP digital audio processor
and converter.
U8 and U9 (OP275) are low noise and distortion audio
op amps. U8 provides differential-to-single-ended conversion
for the left and right channel outputs, while U9 does the
same for the sub channel. A third order low-pass Bessel
filter response is implemented with a –3 dB corner frequency
of 100 kHz on the left and right channels, 10 kHz on
the subchannel, and a 60 dB/decade (18 dB/octave) roll-off.
This type of filter is characterized by a linear phase response
and fast transient response without overshoot.
U10 (LM317) provides 5 V dc low voltage regulation for
the digital section of the evaluation board.
U11 (ADP3303-5) is a low noise 5 V dc regulator for the
analog section of the AD1953.
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SOFTWARE
The AD1953 evaluation board comes with software that can be
used to control all of the part’s functions. The evaluation board
interfaces with this software via the 25-lead header (J12), which
connects to a computer’s parallel port.
Custom programming tools are available for the AD1953. A
Graphical Compiler, in conjunction with OrCAD, can be used
to design custom signal processing algorithms using any of the
AD1953’s processing blocks. All settings can be programmed
with this Graphical Compiler, which writes to the program and
parameter RAMs through the SPI port of the AD1953.
More in-depth documentation is available for all software.
FURTHER INFORMATION
Ordering information: order number is EVAL-AD1953EB.
For application questions, please contact our Central Applica-
tions Department at 1-781-937-1428.
U13 (M4A5-128/64) provides decoding, buffering, and
selection functions between the different modes of operation.
U14 (74HC243) is a quad three-state noninverting buffer.
U15 (74AC244) is an octal noninverting buffer/line driver
with three-state outputs.
U16 (NC7S14) is a high performance inverter with Schmitt
trigger input.
U12 (ADM811) is a RESET generator that provides a
debounced reset signal from the push-button (SW1) or a
240 ms reset pulse on power-up.
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