cxa2555q Sony Electronics, cxa2555q Datasheet

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cxa2555q

Manufacturer Part Number
cxa2555q
Description
Rf Amplifier For Cd Player/cd-rom
Manufacturer
Sony Electronics
Datasheet
For the availability of this product, please contact the sales office.
Description
of CD player and CD-ROM.
Features
• Wide-band RF AC amplifier
• 4-mode RF equalizer (active filter type)
• RF equalizer boost amount and cut-off frequency
• EFM time constant adjustable (switching function
• Peak hold time constant of mirror circuit adjustable
• Tracking error amplifier cut-off frequency adjustable
• Tracking error amplifier voltage gain adjustable
• Center error amplifier
• APC (Automatic Power Control) function
• APC ON/OFF control
• Supports laser coupler
Absolute Maximum Ratings
• Supply voltage
• Storage temperature
• Power consumption
Operating Conditions
• Supply voltage
• Operating temperature Topr
The CXA2555Q is an IC for RF signal processing
(RF AC signal fc
adjustable
provided)
RF Amplifier for CD Player/CD-ROM
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.
20MHz)
V
Tstg
P
V
CC
D
CC
– GND 3.0 to 5.5
–65 to +150
800
–20 to +75 °C
7
mW
°C
V
V
– 1 –
Applications
• CD players
• CD-ROM drives
Functions
• RF summing amplifier
• RF equalizer
• Focus error amplifier
• Tracking error amplifier
• Center error amplifier
• Mirror detection function
• APC circuit
CXA2555Q
32 pin QFP (Plastic)
E96730B76

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cxa2555q Summary of contents

Page 1

... RF Amplifier for CD Player/CD-ROM For the availability of this product, please contact the sales office. Description The CXA2555Q for RF signal processing of CD player and CD-ROM. Features • Wide-band RF AC amplifier (RF AC signal fc 20MHz) • 4-mode RF equalizer (active filter type) • RF equalizer boost amount and cut-off frequency adjustable • ...

Page 2

... VC 10k Open only for L/L mode VC 20k 40k 55k 1.25V VC 40k 20k VCA 87k 16k VC 16k VCA 73.34k 320k 164k – 2 – CXA2555Q 26 25 FILTER CONTROL 24 MODE 1 MODE SW VCA MODE 2 20k 80k 22 RFO 1 22k 51k RFO ...

Page 3

... VCA 36.7k 147 – 3 – CXA2555Q Description APC amplifier output. APC amplifier input. Input of RF summing amplifier and focus error amplifier. Ground. 6 Tracking error amplifier input for Pins 5 and 6; tracking error amplifier output for Pin 8; ...

Page 4

... V CC 10k 147 120k 80k 10k – 4 – CXA2555Q Description Center error amplifier input for pin 9; inverting amplifier output for pin 10; non-inverting amplifier output for pin 11. Focus bias adjustment for Pin 14; focus error amplifier output for Pin 15. (Vcc + GND)/2 DC voltage output ...

Page 5

... CXA2555Q Description Connects a mirror hold capacitor. Non-inverted input of mirror comparator. Mirror comparator output. Power supply. Buffer switch output for the RF time constant setting for Pin 21. ON when Pins 23 and 24 are connected to GND. ...

Page 6

... CXA2555Q Description Input to set the RF equalizer LPF cut-off frequency. Sets the high-frequency boost amount of RF equalizer. Sets the low-frequency gain of RF amplifier and RF equalizer. RF equalizer input. RF summing amplifier output inversion. ...

Page 7

... Pin Symbol I/O No. 31 RFI RFO O Equivalent circuit 39k 147 18k 44k 15k 147 32 15k – 7 – CXA2555Q Description Mirror circuit input. The RF summing amplifier output is input. RF signal output. Eye pattern check point. ...

Page 8

... DC RF – 8 – CXA2555Q amplifier FE ...

Page 9

... TE – 9 – CXA2555Q amplifier CE ...

Page 10

... Amplifier) Sum + Equalizer (RF Amplifier RFAC – 10 – CXA2555Q MIRR ...

Page 11

... APC VC – 11 – CXA2555Q ...

Page 12

... 5. 10k 10k 10k S6 100k 20k 20k – 12 – CXA2555Q V CC 20k V CC S13 5. S12 24 MODE S11 MODE 1µ 10k RFO 1 22 1µ 10k ...

Page 13

... VC 3.9k 0.1µ 0.1µ 47k 10k – 13 – CXA2555Q 6. MODE MODE 1 MODE 2 23 MODE 2 IN 1000p RFO 1 22 4700p RFO Out V CC 33µ ...

Page 14

... The transmittance for each filter is as follows HPF: ( 3.22597S + 2.94933) 2 LPF1: (2.94933 ) / (S + 3.22597S + 2.94933) 2 LPF2: (3.32507 ) / (S + 2.75939S + 3.32507) 2 LPF3: (4.20534 ) / (S + 1.82061S + 4.20534) LPF4: (1.68536 ) / (S + 1.68536) MIXER LPF2 LPF3 LPF4 – 14 – CXA2555Q VCA EQ OUT RF C ...

Page 15

... PD1) FE 16k = 10.9 (PD2 – PD1) 47k Vc SUM OUT 30 28 10k 20k 3 20k VCA Summing Amp (RFC voltage = 1/2 VC) 27p 174k I-V 16k PD1 3 Focus 16k PD2 Error Amp 4 I-V 164k 87k 27p 47k – 15 – CXA2555Q RF C RFO ...

Page 16

... Vin 100k The low frequency component of the CE output voltage is as follows: 100k 20k V = Vin CE 10k 20k = 10 Vin 14p Vc E 73.4k 5 VCA TE1 47k (TEC voltage = 1/2 VC) 20k CE IN 20k 9 23k CE1 10k 10 Vc – 16 – CXA2555Q 2p 320k ...

Page 17

... The mirror hold time constant must be sufficiently large in comparison with the traverse signal. 80k 80k H Peak & Bottom J Hold I 80k Mirr Open only 80k Dif Amp for L/L mode 1.3V 17 MIRR T – 17 – CXA2555Q Mirr 1.0V Hold 51k Amp CP 18 22k 0.33µ K 20k Mirr Comparator Vcc 19 MIRR ...

Page 18

... APC connecting APC_ON pin to GND OFF by connecting the pin to Vcc 10k Buffer 56k 100µ 10k 55k 56k 10k 1.25V – 18 – CXA2555Q Vc 10 10µ 100 500 1µ ...

Page 19

... To ensure stable operation recommended to select Rfc value of 6.2k and below in all cases. 8 Rfc =6.8k , L – 0.8 – 19 – CXA2555Q Boost gain characteristics Rbst [k ] VCA characteristics 1.0 1.2 1.4 1.6 1 [V] and above, and Rbst of 10k ...

Page 20

... 0 0.4 0 frequency response (Pin 11 – 20 – CXA2555Q VCA characteristics 1.0 1.2 1.4 1.6 1 [V] VCA characteristics 0.8 1.0 1.2 1.4 1.6 1.8 2 [V] Frequency response Frequency [kHz] ...

Page 21

... Maximum operating frequency vs. MIRR T pin voltage 600 550 500 450 400 350 300 250 200 150 100 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 MIRR T [V] APC Characteristics Graph (Pin 1) LD voltage vs. PD voltage 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 80 100 120 140 160 PD [mV] – 21 – CXA2555Q Vin = –0.4V , 800mVp-p DC H/L, L/H, or H/H Mode 180 200 ...

Page 22

... SONY CODE QFP-32P-L01 EIAJ CODE QFP032-P-0707-A JEDEC CODE 32PIN QFP (PLASTIC 0.15 ± 0.12 M PACKAGE MATERIAL LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT – 22 – CXA2555Q 0.1 + 0.35 1.5 – 0.15 + 0.2 0.1 – 0.1 + 0.1 0.127 – 0.05 0° to 10° EPOXY RESIN SOLDER PLATING 42 ALLOY 0.2g ...

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