cxd2548r Sony Electronics, cxd2548r Datasheet - Page 88
cxd2548r
Manufacturer Part Number
cxd2548r
Description
Cd Digital Signal Processor With Built-in Digital Servo And Dac
Manufacturer
Sony Electronics
Datasheet
1.CXD2548R.pdf
(113 pages)
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Part Number:
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§4-15. Writing the Coefficient RAM
The coefficient RAM can be rewritten by $34. All coefficients have default values in the built-in ROM, and
transfer from the ROM to the RAM is completed approximately 40µs after the XRST pin rises. (The coefficient
RAM cannot be rewritten during this period.)
After that, the characteristics of each built-in filter can be finely adjusted by rewriting the data for each address
of the coefficient RAM.
The coefficient rewrite command is comprised of 24 bits, with D14 to D8 of $34 as the address (D15 = 0) and
D7 to D0 as data.
§4-16. PWM Output
FCS, TRK and SLD outputs are output as PWM waveforms.
In particular, FCS and TRK permit accurate drive by using a double oversampling noise shaper.
Timing Chart 4-3 and Fig. 4-13 show examples of output waveforms and drive circuits.
MCK
(5.6448MHz)
FCS/TRK
t
MCK
FFDR/
TFDR
FRDR/
TRDR
SRDR
SFDR
SLD
=
5.6448MHz
1
A
2
t
MCK
32t
At
MCK
MCK
180ns
Output value +A
64t
MCK
A
2
t
MCK
32t
MCK
Timing Chart 4-3.
A
2
t
MCK
– 88 –
32t
At
MCK
MCK
Output value –A
64t
MCK
A
2
t
MCK
32t
MCK
32t
MCK
Output value 0
64t
MCK
32t
CXD2548R
MCK
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