CXA1782

Manufacturer Part NumberCXA1782
DescriptionRF Signal Processing Servo Amplifier for CD players
ManufacturerSONY [Sony Corporation]
CXA1782 datasheet
 
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RF Signal Processing Servo Amplifier for CD players
For the availability of this product, please contact the sales office.
Description
The CXA1782CQ/CR is a bipolar IC with built-in
RF signal processing and various servo ICs. A CD
player servo can be configured by using this IC,
DSP and driver.
Features
• Low operating voltage (V
– V
CC
• Low power consumption (39mW, V
• Supports pickup of either current output, voltage
output
• Automatic adjustment comparator for tracking
balance gain
• Single power supply and positive/negative dual
power supplies
Applications
• RF I-V amplifier, RF amplifier
• Focus and tracking error amplifier
• APC circuit
• Mirror detection circuit
• Defect detection and prevention circuits
• Focus servo control
• Tracking servo control
• Sled servo control
• Comparators of tracking adjustment for balance
and gain
Structure
Bipolar silicon monolithic IC
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
CXA1782CQ/CR
CXA1782CQ
48 pin QFP (Plastic)
= 3.0 to 11.0V)
EE
= 3.0V)
CC
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage
• Operating temperature Topr
• Storage temperature
• Allowable power dissipation
Recommended Operating Condition
Operating supply voltage
– 1 –
CXA1782CR
48 pin LQFP (Plastic)
V
12
V
CC
–20 to +75
°C
Tstg
–65 to +150
°C
P
833 (CXA1782CQ) mW
D
457 (CXA1782CR) mW
V
– V
3.0 to 11.0
V
CC
EE
E95908C78

CXA1782 Summary of contents

  • Page 1

    ... RF Signal Processing Servo Amplifier for CD players For the availability of this product, please contact the sales office. Description The CXA1782CQ/ bipolar IC with built-in RF signal processing and various servo ICs player servo can be configured by using this IC, DSP and driver. Features • Low operating voltage (V – ...

  • Page 2

    ... DFCT TTL •ADRESS.DECODER I IL •OUTPUT DECODER FS1 to 4 TG1 to 2 TM1 to 7 PS1 to 4 •TRACKING PHASE COMPENSATION •I SET TM6 TM5 TM4 TM3 FS1 TM7 TG2 CXA1782CQ/CR 24 SENS 23 C.OUT 22 XRST 21 DATA 20 XLT CLK 19 18 Vcc ISET 17 SL_O 16 15 SL_M ...

  • Page 3

    ... CXA1782CQ/CR Description Focus error amplifier output. Connected internally to the FZC comparator input. Focus error input. Capacitor connection pin for defect time constant. Ground this pin through a capacitor when decreasing the focus servo high-frequency gain ...

  • Page 4

    ... CXA1782CQ/CR Description External time constant setting pin for generating focus servo waveform. External time constant setting pin for switching tracking high-frequency gain. External time constant setting pin for switching tracking high-frequency gain. ...

  • Page 5

    ... CXA1782CQ/CR Description Setting pin for Focus search, Track jump, and Sled kick current. Serial data transfer clock input from CPU. (no pull-up resistance) Latch input from CPU. (no pull-up resistance) Serial data input from CPU. ...

  • Page 6

    ... CXA1782CQ/CR Description Connection pin for MIRR hold capacitor. MIRR comparator non-inverted input. Input for the RF summing amplifier output with capacitance coupled. RF sunning amplifier output. Eye-pattern check point. RF summing amplifier inverted 32 input ...

  • Page 7

    ... CXA1782CQ/CR Description Bias adjustment of focus error amplifier. F I-V and E I-V amplifier inverted input. Connect these pins to photo diodes F and E. I-V amplifier E gain adjustment. (When not using automatic balance adjustment) Tracking error amplifier output. ...

  • Page 8

    ... Equivalent circuit 147 100k 147 1k 10k 100k 10k 46 75k 120 50 120 VC – 8 – CXA1782CQ/CR Description Tracking error input. Capacitor connection pin for defect time constant. 100k Window comparator input for ATSC detection. 1k Tracking zero-cross comparator input )/2 DC voltage output ...

  • Page 9

    ... RF amplifier FE – 9 – CXA1782CQ/CR amplifier TE ...

  • Page 10

    ... TE APC servo FCS – 10 – CXA1782CQ/CR servo TRK ...

  • Page 11

    ... Servo TRK – 11 – Sled MIRR CXA1782CQ/CR DEFECT ...

  • Page 12

    ... S11 200k – 12 – 3300p SENS 10k 23 C. OUT 10k 22 XRST DATA 21 20 XLT 19 CLK Vcc 18 ISET 17 240k SL_O 16 13k 15 SL_M 5.1k S14 SL_P 14 TA_O S12 CXA1782CQ/CR Vcc Vcc XRST DATA XLT CLK A Vcc V EE 10k ...

  • Page 13

    ... TEO 43 LPFI 44 TEI 45 ATSC 46 TZC 47 TDFCT 22k 100k 0.033µ – 13 – CXA1782CQ/CR 0.033µ DSP SENS 23 C. OUT DSP MICRO XRST 22 COMPUTER DATA 21 DSP 20 DSP XLT 19 CLK DSP Vcc Vcc 18 120k ISET ...

  • Page 14

    ... VB 36 PD2 IV AMP VC RFO 25p 174k 32k AMP 32k 25p 87k 164k VC FE_BIAS 47k = 5.4 (V – (iPD2 – iPD1) FEO A B – 14 – 22k RF_M RF_O SUMMING AMP 127.6kΩ (iPD1 + iPD2 FEO 315kΩ. CXA1782CQ/CR ...

  • Page 15

    ... The CXA1782 tracking block has built-in circuits for balance and gain adjustments to enable software-based automatic adjustment. The balance adjustment is performed by varying the combined resistance value of the T-configured feedback resistance at E I-V AMP. F I-V AMP feedback resistance = R E I-V AMP feedback resistance = R Vary the value the formula above by using the balance adjustment switches (BAL1 to BAL3) ...

  • Page 16

    ... The comparison signal is output from Pin 24 (SENS). Address 3 selects the automatic adjustment comparator output, and HPF for data (D3 LPF for data (D3 selected. • The anti-shock circuit always operates in the CXA1782 so that TG1 and TG2 (address 1 : D3) should be set to 1 for tracking adjustment to prevent this effect. ...

  • Page 17

    ... When the laser diode is driven with constant current, the optical output possesses large negative temperature characteristics. Therefore, the current must be controlled with the monitor photo diode to ensure the output remains constant. Vcc 10µH V GND 10k 55k 10k – 17 – CXA1782CQ/ Vcc 56k 56k 10k VREF 1.25V V EE ...

  • Page 18

    ... FE 9k 51k FZC DFCT FS4 68k Focus phase Compensation 40k FLB FSET 5 11 0.1µ 510k 0.01µ and VC (Pin 48 – 18 – CXA1782CQ/CR FOCUS COIL FE_O 100k 6 100k 50k FE_M 7 11µ 22µ ISET 120k 17 50k FS1 FS2 SRCH 8 4.7µ – VC) 15%. ...

  • Page 19

    ... TG2 is OFF. The peak frequency of the tracking phase compensation is approximately 1.2kHz when a 510kΩ resistance connected to Pin 11. In the CXA1782, TG1 and TG2 are inter-linked switches. To jump tracks in FWD and REV directions, turn TM3 or TM4 ON. During this time, the peak voltage applied to the tracking coil is determined by the TM3 or TM4 current and the feedback resistance from Pin 12 ...

  • Page 20

    ... DEFECT RF 54k 1 VG 92k 15k 0.625V FOCUS OK AMP – V –0.37V. RFI RFO 0.033µ CC1 27 DEFECT BOTTOM HOLD 28 CB 0.01µ – 20 – CXA1782CQ/ 20k 25 FOK FOCUS OK COMPARATOR CC2 SENS 24 d DEFECT SW DEFECT COMPARATOR d BOTTOM HOLD (2) ; dotted Line: CC2 ...

  • Page 21

    ... High; and when a defect is detected High. The mirror hold time constant must be sufficiently large compared with the traverse signal. In the CXA1782, this mirror output is used only during braking operations, and no external output pin is attached. Accordingly, when connecting DSP such as the CXD2500 with MIRR input pin, input the C. OUT output to the MIRR input of the DSP ...

  • Page 22

    ... The input data to operate this IC is configured as 8-bit data; however, below, this input data is represented by 2-digit hexadecimal numerals in the form $XX, where hexadecimal numeral between 0 and F. Commands for the CXA1782 can be broadly divided into four groups ranging in value from $0X to $3X. 1. $0X (“FZC” at SENS pin (Pin 24)) These commands are related to focus servo control ...

  • Page 23

    ... Drive voltage Focus error SENS pin (FZC) Focus Fig. 3. S-curve (20ms) (200ms) $02 $03 $08 The instant the signal is brought into focus. Fig. 4. Focus ON timing chart – 23 – CXA1782CQ/CR The broken lines in the figure indicate the voltage assuming the signal is not in focus. ...

  • Page 24

    ... TG1, TG2 Break Sled kick circuit height ON/OFF ON/OFF – 24 – CXA1782CQ/CR Transfer $ YES FZC ? NO YES Latch (B) Sled kick height D0 ...

  • Page 25

    ... CXA1782 From outer to inner track Fig. 7. Internal waveform Tracking control 00: OFF 01: Servo ON 10: F-JUMP 11: R-JUMP TM1, TM3, TM4 – 25 – CXA1782CQ/ TM7 Low: open BRK High: make (“MIRR”) (“TZC”) Braking is applied from here Sled control ...

  • Page 26

    ... In a fashion similar to the method used with the balance adjustment, set the data by sending a latch pulse with specifying the switch conditions D0 to D2. START C. OUT Is the frequency BAL1 to BAL3 high enough ? SENS output Balance OK ? Adjustment Completed Balance adjustment TOG1 to TOG3 Switch control GAIN YES Adjustment Completed Gain adjustment – 26 – NO YES START SENS CXA1782CQ/CR ...

  • Page 27

    ... FWD MOVE 1 REV MOVE 1 – 27 – 3.0V) Unit MHz FS1 FS2 Search Search OFF = Down = 0 Sled Sled Kick + 2 Kick + 1 2 Sled Mode CXA1782CQ/ SENS output FZC DEFECT TZC Gain/Bal ...

  • Page 28

    ... CXA1782CQ/CR FS2 FS1 DEFECT E: enable disable ...

  • Page 29

    ... DATA HEXADECIMAL $ $ $ $ $38 min. (TOG SW max. (TBAL SW – 29 – CXA1782CQ/CR DATA Balance switch setting DATA Gain switch setting ...

  • Page 30

    ... V CC 100k Vsat (NPN Measurement pin Conditions C = 0.1µF FLB 0.1µF FGD 0.1µF TGU – 30 – CXA1782CQ/CR Large Large V CC 20k FOK Typ. Unit 21 deg 13 dB –125 deg 26.5 dB – ...

  • Page 31

    ... NOTE: Dimension “ ” does not include mold protrusion. DETAIL A PACKAGE STRUCTURE PACKAGE MATERIAL LQFP-48P-L01 LEAD TREATMENT SONY CODE EIAJ CODE QFP048-P-0707-A LEAD MATERIAL JEDEC CODE PACKAGE WEIGHT – 31 – + 0.1 0.15 – 0.05 0.15 + 0.2 0.1 – 0.1 PLATING 0.1 EPOXY / PHENOL RESIN SOLDER PLATING 42 ALLOY 0.2g CXA1782CQ/CR ...