Read Harman Kardon HD 750 Service Manual online
HD750
Overview
The MN662790RSA is a CD signal processing LSI that,
on a single chip, combines optics servos for the CD player
(focus, tracking, and traverse servos), digital signal
processing (EFM demodulation and error correction),
digital servo processing for the spindle motor, digital
filter, and D/A converter, so thus covers all signal
processing functions from the head's RF amplifier onward.
(focus, tracking, and traverse servos), digital signal
processing (EFM demodulation and error correction),
digital servo processing for the spindle motor, digital
filter, and D/A converter, so thus covers all signal
processing functions from the head's RF amplifier onward.
Features
(Optics servo)
Focus, tracking, and traverse servos
Automatic adjustment functions for FO/TR gain,
FO/TR offset, and FO/TR balance
Built-in D/A converter for drive voltage output
Built-in dropout countermeasures
Anti-shock functions
Built-in track cross counter Digital input pins
Traverse speed detection function
Automatic adjustment functions for FO/TR gain,
FO/TR offset, and FO/TR balance
Built-in D/A converter for drive voltage output
Built-in dropout countermeasures
Anti-shock functions
Built-in track cross counter Digital input pins
Traverse speed detection function
(Digital Signal Processing)
Built-in DSL and PLL
Frame synchronization detection, holding, and
insertion
Subcode data processing
Frame synchronization detection, holding, and
insertion
Subcode data processing
Subcode Q data CRC check
Built-in subcode Q data register
Built-in subcode Q data register
CIRC error detection and correction
C1 decoder: duplex error correction
C2 decoder: triplex error correction
Built-in 16-K bits of RAM for use in de-
C2 decoder: triplex error correction
Built-in 16-K bits of RAM for use in de-
interleaving
Audio data interpolation
Averaging or retention of previous values
Digital attenuation (–12 dB)
Digital attenuation (–12 dB)
Audio data peak level detection function
Digital audio interface (EIAJ format)
Audio data serial interface for input and output
Digital audio interface (EIAJ format)
Audio data serial interface for input and output
(Spindle Motor Servo)
CLV digital servo
Switchable servo gain
Switchable servo gain
MN662790RSA1
Signal Processing LSI for CD Players
(Audio circuits)
Digital filter using 8-fold oversampling
Built-in D/A converter (1-bit D/A converter)
Built-in differential operational amplifier (secondary
Built-in D/A converter (1-bit D/A converter)
Built-in differential operational amplifier (secondary
low pass filter)
(Other)
Built-in playback pitch control function (normal
speed only) (
±
13%)
Support for quadruple-speed playback (digital servo
and signal processing block only)
Built-in support for jitter-free disc rotation synchro-
nization playback
Oscillator shutdown mode
Power management mode
Operating voltage 3.3 V for internal circuit; 5 V for
Power management mode
Operating voltage 3.3 V for internal circuit; 5 V for
Applications
CD players
15
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