LA9251 Sanyo Semiconductor Corporation, LA9251 Datasheet
LA9251
Available stocks
Related parts for LA9251
LA9251 Summary of contents
Page 1
... Ordering number : ENN6125 Overview The LA9251M is a servo signal-processing IC for CD players. In combination with a CD DSP such as the LC78626KE, it can implement a CD player with a minimal number of external components. Functions • I/V amplifier • SLC • FE • Focus servo amplifier • Spindle servo amplifier (with gain switching function) • ...
Page 2
... HFL output voltage (high) HFL-H HFL output voltage (low) HFL-L TES output voltage (low-high) TES-LH TES output voltage (high-low) TES-HL TES output voltage (high) TES-H TES output voltage (low) TES-L JP output voltage (high) JP-H LA9251M Symbol Conditions Conditions No input VR SLOF SP8 mode ESTA R = 390 kΩ ...
Page 3
... SP CLV pin input signal inverted output 24 SPG Gain setting resistor connection (12 cm spindle mode) LA9251M Conditions At SPD, the difference from VR, SP8 = mode At SPD, the difference from VR, SP8 = mode The difference from offset 12, SP8 = mode, CLV = 3 V The difference from offset 8, ...
Page 4
... Reference voltage bypass capacitor connection 58 VR Reference voltage output 59 LF2 Disc defect detection time constant setting 60 PH1 RF signal peak hold capacitor connection 61 BH1 RF signal bottom hold capacitor connection 62 LDD APC circuit output 63 LDS APC circuit input 64 (NC) No connection LA9251M Function No. 6125-4/17 ...
Page 5
... Pin Circuits Pin No. Pin 1 FIN2 2 FIN1 – – – – SLEQ 50 SLI TESI 43 TES LA9251M Internal equivalent circuit 2 1 62k 4 3 100k 5pF 200k V REF 62k 5pF V REF 100k 5pF V REF V CC 250 GND GND Continued on next page. No. 6125-5/17 ...
Page 6
... Continued from preceding page. Pin No. Pin 9 9 SCI 41 TGL 50k – LA9251M Internal equivalent circuit REF REF 20k V REF 40k 100k 10pF V REF GND V CC 10k GND V CC 250 GND REF GND REF 250 GND Continued on next page. No. 6125-6/17 ...
Page 7
... Continued from preceding page. Pin No. Pin SPD 49 SLC – CLV SPG 24 LA9251M Internal equivalent circuit 250 REF 240k 15pF 40k V CC 250 GND 30k 10k 80k 80k 5pF 50k V CC GND REF 250 GND V REF V CC 250 GND REF 250 GND Continued on next page ...
Page 8
... Continued from preceding page. Pin No. Pin 28 28 SLD 29 SL – OSC 33 SLOF 35 SP8 38 LASER 34 TGRF 36 EFBAL 37 FSTA 40 TJP LA9251M Internal equivalent circuit V REF 30k 40 30k 20k REF 250 GND 50k GND V CC GND V REF V CC 250 GND Continued on next page. No. 6125-8/17 ...
Page 9
... Continued from preceding page. Pin No. Pin 42 TOFF 44 HFL 51 DEF 52 DRF 53 FSC PH1 61 BH1 – TBC LA9251M Internal equivalent circuit 42 30k 250 GND 48 V REF REF 1k 54 GND V CC GND V CC GND REF GND V REF V REF Continued on next page. No. 6125-9/17 ...
Page 10
... Continued from preceding page. Pin No. Pin 55 FSS 57 REFI LF2 62 LDD 63 LDS LA9251M Internal equivalent circuit 50k 55 GND GND 58 59 50k 62 200 180k 100 GND V CC GND V CC GND No. 6125-10/17 ...
Page 11
... APC RF DET FIN2 1 FIN1 VCA 2 I BAL VCA TESI 8 7 SCI 9 T. SERVO TH &T. LOGIC SERVO 14 &F. LOGIC LA9251M REF LA9251M SPINDLE SERVO SLC RF AMP SLED SERVO No. 6125-11/ GND 46 CLV 45 HFL 44 TES 43 TOFF 42 TGL 41 TJP LASER 38 FSTA 37 EFBAL 36 SP8 35 TGRF 34 SLOF 33 ...
Page 12
... The E/F balance adjustment operation is started by switching EFBAL (pin 36) from low to high. After that, the adjustment operation is performed by a clock generated by an internal oscillator, and the adjustment completes in about 500 ms. We recommend holding EFBAL (pin 36) high until the next time an E/F balance operation performed. LA9251M – (pin 18). – ...
Page 13
... RF peak value exceeds about 1.3 V (when V the DRF detection time constant and the RF AGC response. DRF RFSM FE Pickup position LA9251M – (pin 29) and SL+ (pin 30). In particular, a resistor is connected – (pin 25), and SPD. The 12 cm mode amplifier gain is set ...
Page 14
... V. When DEF goes high, the tracking servo goes to THLD mode. When a defect is detected applications can prevent the LA9251M from going to THLD mode either by setting DEF to low or by setting LF2 (pin 59) low and thus setting the LA9251M not to output DEF. ...
Page 15
... F1I F1IAC 0. EIAC 0. FIAC 0. 20k 0.01 F TESI AC TESI 73 8 SCI 9 TH 0.068 REF REF LA9251M REF LA9251M 39k 15k S1 30k REF 77 76 100k 0 GND 46 CLV 45 HFL 44 TES 43 TOFF 42 TGL 41 TJP LASER 38 FSTA 37 EFBAL 36 SP8 35 TGRF 34 SLOF 100pF REF 74 75 No. 6125-15/17 ...
Page 16
... 100 F 0.022 LF2 F 100 F 0.01 PH1 F 1 BH1 F 0.33 LDD F 47 LDS LASER 10 APC.ADJ NC F 220 F 0.01 LA9251M F 0 TEST3 OUT SFSY D SBCK C2F FSX EMPH WRQ CONT5 RWC CONT4 SQOUT CONT3 COIN CONT2 CQCK CONT1 DD RES V TEST11 FSEQ 16M PCK 4 ...
Page 17
... SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of April, 2000. Specifications and information herein are subject to change without notice. LA9251M PS No. 6125-17/17 ...