SM9103M Datasheet, PDF (1/14 Pages) Nippon Precision Circuits Inc – DVDRAM Head Amplifier LSI

NIPPON PRECISION CIRCUITS INC.
SM9103M
DVDRAM Head Amplifier LSI
OVERVIEW
The SM9103M is a photodiode photoelectric cur-
rent-to-voltage conversion head amplifier LSI for
optical disk pickups in DVDRAM/DVDROM equip-
ment. 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.
FEATURES
s RAM/ROM gain switching, low-noise RF signal
generator (differential output)
s ROM tracking DPD signal output
s Variable-gain RAM tracking push-pull signal out-
put
s Address signal, high-speed push-pull signal output
s Variable-gain focus error signal output
s Tracking PD sum signal output
s Focus PD sum signal output
s Offset correction timing output (logic)
s Temperature monitor function
s Serial interface to control internal parameter set-
tings
s Sleep-mode function
s Single 5 V supply
s 36-pin plastic SSOP
PINOUT
36-pin SSOP
(Top view)
MODE 1
WRITE 2
DGND 3
DVCC 4
TEMPO 5
TEMPI 6
T1 7
T2 8
T3 9
T4 10
F1 11
F2 12
AGND 13
VREF 14
FSUBB 15
FSUB 16
FADDB 17
FADD 18
TYPICAL APPLICATIONS
s Double-speed DVDROM equipment
s Double-speed DVDRAM equipment
ORDERING INFORMATION
Device
SM9103M
Package
36-pin SSOP
36 SCLK
35 SDATA
34 SENB
33 CALREQ
32 TADD
31 TADDB
30 CAPAP
29 CAPAN
28 TSUB
27 TSUBB
26 DATAP
25 DATAN
24 DPDA
23 DPDB
22 DPDC
21 DPDD
20 AVCC
19 AGND
NIPPON PRECISION CIRCUITS—1