Details, datasheet, quote on part number: SM5142AM
PartSM5142AM
CategoryMultimedia => Audio
DescriptionDVD RAM Head Amp ic
CompanyNippon_Precision_Circuits America
DatasheetDownload SM5142AM datasheet
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Features, Applications

The is a photodiode photoelectric current-to-voltage conversion head amplifier LSI for optical disk pickups in DVDRAM/DVDROM equipment. It sums the photodiode current data signals and then converts the signals to a differential signal for output. The output tracking servo and focusing servo signals are derived from built-in sum and difference circuits, and the gain for these servo signals can be adjusted using serial interface controls. Each of the signals from the photodiodes, used to generate DPD (Differential Phase Detection) tracking servo signal, is current-to-voltage converted and then also output. It operates from a single 5 V supply, and is available in 36-pin plastic SSOP packages.

MODE WRITE DGND DVCC TEMPO TEMPI T3 T4
SCLK SDATA SENB CALREQ TADD TADDB CAPAP CAPAN TSUB TSUBB DATAP DATAN DPDA DPDB DPDC DPDD AVCC AGND
FEATURES

RAM/ROM gain switching, low-noise RF signal generator (differential output) ROM tracking DPD signal output Variable-gain RAM tracking push-pull signal output Address signal, high-speed push-pull signal output Variable-gain focus error signal output Tracking PD sum signal output Focus PD sum signal output Offset correction timing output (logic) Temperature monitor function Serial interface to control internal parameter settings Sleep-mode function Single 5 V supply 36-pin plastic SSOP

AGND VREF FSUBB FSUB FADDB FADD
TYPICAL APPLICATIONS
Double-speed DVDROM equipment Double-speed DVDRAM equipment

to 1.01 DATAP DATAN TADDB TADD CAPAP CAPAN TSUBB TSUB DPDA DPDB DPDC DPDD CALREQ FSUB FSUBB FADDB FADD

Gain switching amplifier (RAM read/write, ROM read)
Differential output buffer Gain switch (2dB step)
Thermal sensor Offset canceller Canceller control

Number Name MODE WRITE DGND DVCC TEMPO TEMPI F1 F2 AGND VREF FSUBB FSUB FADDB FADD AGND AVCC DPDD DPDC DPDB DPDA DATAN DATAP TSUBB TSUB CAPAN CAPAP TADDB TADD CALREQ SENB SDATA SCLK I/O1 Ipd I/O I Function Mode switching/offset correction control input 1 Mode switching/offset correction control input 2 Logic circuit ground. Connect to the analog ground if there is no dedicated pickup or logic ground. Logic circuit supply. Connect to the analog supply if there is no dedicated pickup or logic supply. Thermal sensor test output. Leave open for normal operation Thermal sensor test input. Leave open for normal operation Tracking PD input A Tracking PD input B Tracking PD input C Tracking PD input D Focus PD input E Focus PD input F Analog circuit ground 2.0 V reference voltage input Focus error signal feedback input Focus error signal output Focus sum signal feedback input Focus sum signal output Analog circuit ground Analog circuit supply Buffered tracking signal output D for DPD servo Buffered tracking signal output C for DPD servo Buffered tracking signal output B for DPD servo Buffered tracking signal output A for DPD servo Phase-modulated data signal differential inverting output Phase-modulated data signal differential non-inverting output Tracking push-pull signal feedback input Tracking push-pull signal output ID data signal differential inverting output ID data signal differential non-inverting output Tracking PD sum signal feedback input Tracking PD sum signal output Offset correction status/request output Serial interface enable input Serial interface data input/acknowledge output Serial interface clock input

I = input, Ipd = Input with built-in pull-down resistor, I/O = input/output, O = output

 

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