Philips tza1020 DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

TZA1020; TZA1020A

Pre-amplifiers for CD-RW systems

Product speciﬁcation File under Integrated Circuits, IC01

2000 Oct 30

Philips Semiconductors Product speciﬁcation

Pre-ampliﬁers for CD-RW systems TZA1020; TZA1020A

CONTENTS

1 FEATURES 2 GENERAL DESCRIPTION 3 QUICK REFERENCE DATA 4 ORDERING INFORMATION 5 BLOCK DIAGRAM 6 PINNING 7 FUNCTIONAL DESCRIPTION

7.1 Data amplifier

7.2 Normalizer

7.3 Wobble pre-processor

7.4 Beta detector

7.5 Alpha detector

7.6 Fast track count

7.7 Spot position measurement 8I

8.1 Addressing and data bytes

8.1.1 Write mode

8.1.2 Read mode

8.1.3 Control byte subaddress 00

8.1.4 Control byte subaddress 01

8.1.5 Control byte subaddress 02

8.1.6 Control byte subaddress 03

8.1.7 Control byte subaddress 04

8.1.8 Control byte subaddress 05

8.1.9 Control byte subaddress 06

8.1.10 Control byte subaddress 07

8.2 Characteristics of the I2C-bus

C-BUS PROTOCOL

9 LIMITING VALUES 10 THERMAL CHARACTERISTICS 11 CHARACTERISTICS

11.1 Transfer functions for normalizedservo signals

11.2 Laser power control signals (alpha circuit)

11.3 Wobble pre-processor 12 APPLICATION AND TEST INFORMATION 13 PACKAGE OUTLINE 14 SOLDERING

14.1 Introduction to soldering surface mount packages

14.2 Reflow soldering

14.3 Wave soldering

14.4 Manual soldering

14.5 Suitability of surface mount IC packages for wave and reflow soldering methods

15 DATA SHEET STATUS 16 DEFINITIONS 17 DISCLAIMERS 18 PURCHASE OF PHILIPS I2C COMPONENTS

2000 Oct 30 2

Philips Semiconductors Product speciﬁcation

Pre-ampliﬁers for CD-RW systems TZA1020; TZA1020A

1 FEATURES

• Dataamplifierfor read speed up to twelve times nominal data speed

• Normalized and filtered error signals for servo control

• Wobble pre-processor with switchable low-pass filter

• Calculation of signals for real-time laser power control

for write speed up to four times

• Calculation of signals for optimum laser calibration for write speed up to four times

• Fast track count amplifier

• Spot position measurement for alignment of photo

diodes

• Reference voltage for laser controller

• On-chip band gap and DACs for accurate and

adjustable current/gain settings

• I2C-bus microcontroller interface for programmable gain, speed switching and function selection

• All functions available for CD-R and CD-RW systems.

2 GENERAL DESCRIPTION

TZA1020 (AEGER2) is an analog pre-processor IC for CD-RandCD-RWsystemswith 3-spots push-pull tracking system. The IC interfaces directly to the photo diodes. The device generates signals for laser power calibration and laser power control during disc writing. Normalized error signals are generated for servo control and wobble detection. An HF current amplifier is implemented to detect the actual HF data signal. The Fast Track Count (FTC) amplifier generates a radial error signal to allow fast track counting.

TZA1020A (AEGER2A) is similar to the TZA1020, except for non-clamped MIRN, which allows operation with IGUANA.

3 QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

i(cd)

−3dB(norm)

positive supply voltage 4.5 5.0 5.5 V negative supply voltage −5.5 −5.0 −4.5 V central diode input current range 0 − 4000 µA

−3 dB bandwidth normalized

48 60 − kHz

error signals (servo)

−3dB(CAHF)

∆t

d(g)(CAHF)

−3 dB bandwidth pin CAHF Ci=12pF 17 −−MHz group delay variations pin CAHF f = 0.1 to 12 MHz;

−−0.9 ns

Ci=12pF

I(CAHF)

current gain pin CAHF cdrwsel = 1 − 35 −

cdrwsel = 0 − 8.75 −

RREF

amb

reference current −−900 −µA ambient temperature 0 − 70 °C

4 ORDERING INFORMATION

TYPE

NUMBER

TZA1020HP; TZA1020HP/A

NAME DESCRIPTION VERSION

QFP44 plastic quad ﬂat package; 44 leads (lead length 1.3 mm);

body 10 × 10 × 1.75 mm

PACKAGE

SOT307-2

2000 Oct 30 3

Philips Semiconductors Product speciﬁcation

Pre-ampliﬁers for CD-RW systems TZA1020; TZA1020A

5 BLOCK DIAGRAM

handbook, full pagewidth

ERON

CAGAIN

SA1 SA2 SB1 SB2

C1 C2 C3 C4

AMON

4 8 5 9

10 3 6 7

INPUT

STAGE 3

DIODE INPUT

STAGE 1

DIODE INPUT

STAGE 2

TZA1020

TZA1020A

control

switches

control

currents

LPF 1

LPF 2

NORMALIZER

WOBBLE

PREPROCESSOR

ALPHA

DETECTOR

CURRENT

AMPLIFIER

35 36 37 34 38

27 26

22 21 20 19 24 25

FEN REN TLN XDN MIRN

CWBL PPN

AINT ALS AINTON ASTROBE DALPHA AZIN

CAHF

SDA

SCL

UOUT

RREF

12 13

DD1

I2C-BUS

INTERFACE

DRIVER

DD2

POR

BAND GAP

REFERENCE

SS1

DACs

GND117GND2

SS2

Fig.1 Block diagram.

BETA

DETECTOR

MEAS

FAST TRACK COUNT

44 43 42 39 40 41

32 33

MGR809

CALF A1 A2 CALPF HCA1 HCA2

MEAS1 MEAS2

2000 Oct 30 4

Philips Semiconductors Product speciﬁcation

Pre-ampliﬁers for CD-RW systems TZA1020; TZA1020A

6 PINNING

SYMBOL PIN DESCRIPTION

UOUT 1 reference voltage output RREF 2 reference current input C2 3 central photo diode current input SA1 4 satellite photo diode current input SB1 5 satellite photo diode current input C3 6 central photo diode current input C4 7 central photo diode current input SA2 8 satellite photo diode current input SB2 9 satellite photo diode current input C1 10 central photo diode current input CAGAIN 11 set-point laser power on disc,

current input SDA 12 I SCL 13 I

C-bus data input/output

C-bus clock input

AMON 14 alpha measurement on switch

(write/read state) ERON 15 normalized error signals on switch V

DD2

16 positive supply voltage 2 GND2 17 ground 2 V

SS2

18 negative supply voltage 2 ASTROBE 19 control signal sample-and-hold in

alpha measurement

AINTON 20 control signal integrator in alpha

measurement ALS 21 DALPHA output enabled/disabled AINT 22 integrator capacitor for alpha

measurement CAHF 23 central aperture high-frequency

current output DALPHA 24 alpha error signal for laser power

control AZIN 25 set-point alpha control

SYMBOL PIN DESCRIPTION

PPN 26 normalized, balanced push-pull

signal voltage

CWBL 27 capacitor for EFM noise reduction

loop

DD1

28 positive supply voltage 1 GND1 29 ground 1 V

SS1

30 negative supply voltage 1 RE 31 fast track count signal voltage

output

MEAS1 32 combination of photo diode

currents for adjustment 1

MEAS2 33 combination of photo diode

currents for adjustment 2

XDN 34 normalized spot position error

current output

FEN 35 normalized focus error current

output

REN 36 normalized radial error current

output

TLN 37 normalized track-loss current

output

MIRN 38 mirror output (disc reﬂection)

current output

CALPF 39 capacitor to deﬁne CALF

bandwidth

HCA1 40 capacitor to deﬁne time constant

peak detector A1

HCA2 41 capacitor to deﬁne time constant

peak detector A2

A2 42 pit amplitude relative to CALF,

voltage output

A1 43 land amplitude relative to CALF,

voltage output

CALF 44 low-pass ﬁltered aperture signal,

voltage output

2000 Oct 30 5

Philips Semiconductors Product speciﬁcation

Pre-ampliﬁers for CD-RW systems TZA1020; TZA1020A

handbook, full pagewidth

CALF 44

A1 43

A2 42

HCA2 41

HCA1

MIRN

CALPF 39

TLN 37

REN 36

FEN 35

XDN 34

UOUT

RREF

C2 SA1 SB1

C4 SA2 SB2

CAGAIN

AINT

MEAS2 MEAS1

32 31

RE V

GND1

CWBL

PPN

AZIN

25 24

DALPHA CAHF

MGR810

SS1

DD1

1 2 3 4

5 6 7

SCL

SDA

TZA1020HP

TZA1020HP/A

ERON

AMON

DD2

GND2

SS2

AINTON

ASTROBE

ALS

Fig.2 Pin configuration.

handbook, halfpage

ACB

C1C4C2

SA1 SA2

S1 S2

Fig.3 Quadrant diode configuration.

2000 Oct 30 6

SB1 SB2

MGR811

Philips Semiconductors Product speciﬁcation

Pre-ampliﬁers for CD-RW systems TZA1020; TZA1020A

7 FUNCTIONAL DESCRIPTION

All functions are designed in such a way that a read speed up to twelve times nominal speed is possible (N = 1, 2, 4, 8 or 12). Recording speed up to four is possible (N = 1, 2 or 4). The maximum recording speed must be determined.

7.1 Data ampliﬁer

The central diodes currents (C1 to C4) are fed to a high bandwidth current amplifier. The gain of the current amplifier can be switched by means of the I2C-bus microcontroller interface to compensate for differences in CD-R and CD-RW disc reflection. Data signals up to twelve times nominal data speed can be read.

7.2 Normalizer

The currents from the central diodes (C1 to C4), the currentfrom the satellite diodes (SA1, SA2, SB1 and SB2) and the laser set-point current (CAGAIN) are (optionally sampled) fed to the first low-pass filters with a bandwidth of 60 kHz. The normalizing circuit generates error signals for servo control that are independent of the diode current level. The gain of the error signals is controlled by the I2C-bus microcontroller interface. A dropout concealment becomes active if the input current level is below a certain threshold value. This threshold value is also controlled by the I2C-bus.

7.3 Wobble pre-processor

The wobble signal of the pre-groove is detected by means of the PPN signal. The currents from inputs C1 to C4 are filtered and processed to provide optimal signal-to-noise ratio. The bandwidth of the filter may be adapted to the disc speed via the I2C-bus. The bandwidth of a noise reduction loop is controlled by an external capacitor, the I2C-bus interface controls the total operation of the processor.

7.4 Beta detector

The beta detector generates signals necessary for the symmetry detection of the HF signal. By measuring peak values (A1 and A2) and average value of the signal (CALF), an optimum laser writing power can be determined. The gain of the measured values is controlled by the I2C-bus. The time constant of the peak detectors and bandwidth of the low-pass filtered aperture signal can also be adapted to the disc speed by the I2C-bus.

7.5 Alpha detector

The alpha detector determines a parameter called ‘alpha’ during disc writing. Alpha must be kept constant to allow recording over a fingerprint or black dot. The definition of alpha is different for CD-R and CD-RW; for CD-R the light absorption of the disc is measured, for CD-RW alpha is determined by actual laser power and disc reflection. The gain of the measured signals and the CD-R and CD-RW selection is performed by the I2C-bus.

7.6 Fast track count

The fast track count circuit generates a Radial Error (RE) signal for fast track counting. A gain switch compensates for difference in CD-R and CD-RW disc reflection.

7.7 Spot position measurement

To allow alignment of photo diodes via the TZA1020, a number of linear combinations of input currents can be realized (MEAS1 and MEAS2). Selection of the actual combination is performed by the I2C-bus.

2000 Oct 30 7

Philips Semiconductors Product speciﬁcation

Pre-ampliﬁers for CD-RW systems TZA1020; TZA1020A

8I2C-BUS PROTOCOL

8.1 Addressing and data bytes

Full control of the TZA1020 is accomplished via the 2-wire I2C-bus. Up to 400 kbits/s bus speed can be used in accordance with the I2C-bus fast-mode specification.

For programming the device (write mode) eight data byte registers are available/addressable via eight subaddresses. Automatic subaddress incrementing enables the writing of successive data bytes in one transmission. During power-on, data byte registers are reset to a default state by use of a Power-On Reset (POR) circuit whose signal is derived from the internally generated I2C-bus supply voltage (V

For reading from the device (read mode) one data byte register is available without subaddressing.

8.1.1 WRITE MODE Table 1 Slave address; 34H

Slave address 0 0 1 1 0 1 0 0

Table 2 Subaddress 00H to 07H

Subaddress 0

(1)

SS1

(1)

0 0/1 0/1 0/1

Note

1. The use of subaddresses F0H to F7H (11110XXX) instead of 00H to 07H (00000XXX) disables the automatic subaddress incrementing allowing continuous writing to a single data byte register (e.g. DAC testing).

Table 3 Overview of subaddresses

SUB

ADDR

POR

STATE

DATA BYTES

00H 00000000 alphactr2 alphactr1 alphactr0 alphagain4 alphagain3 alphagain2 alphagain1 alphagain0 01H 00000000 free algctr6 algctr5 algctr4 algct3 algctr2 algctr1 algctr0 02H 00000000 tlngain1 tlngain0 rengain negain4 negain3 negain2 negain1 negain0 03H 00000000 tmdac tlnlim1 tlnlim0 sumref4 sumref3 sumref2 sumref1 sumref0 04H 00000000 sdﬁne7 sdﬁne6 sdﬁne5 sdﬁne4 sdﬁne3 sdﬁne2 sdﬁne1 sdﬁne0 05H 00011111 lexton betactrl1 betactrl0 betascl4 betascl3 betascl2 betascl1 betascl0 06H 01100000 free ppnctrl1 ppnctrl0 ppnscl4 ppnscl3 ppnscl2 ppnscl1 ppnscl0 07H 00000000 porr free urefsel cdrwsel lpsel1 lpsel0 meassel1 meassel0

8.1.2 R

EAD MODE

Table 4 Slave address; 35H

Slave address 0 0 1 1 0 1 0 1

Table 5 Read byte

Read byte por

(1)

(2)

Notes

1. In read mode the actual POR status can be read.

2. The state of unused read bits should not be relied upon; their state may be changed during development.

2000 Oct 30 8

Philips Semiconductors Product speciﬁcation

Pre-ampliﬁers for CD-RW systems TZA1020; TZA1020A

8.1.2.1 Examples of valid transmissions to and from the TZA1020

Write: START - 34H - 00H - Data_for_00 - STOP Write with auto-increment: START - 34H - 00H - data_for_00 - data_for_01 - data_for_02 - STOP Auto-increment ‘wrap around’: START - 34H - 07H - data_for_07 - data_for_00 - data_for_01 - STOP Write without auto-increment: START - 34H - F5H - data_for_05 - data_for_05 - data_for_05 - STOP Read: START - 35H - data_from_ IC - STOP.

8.1.3 CONTROL BYTE SUBADDRESS 00

Table 6 Control bits for alphactrl

alphactrl2 alphactrl1 alphactrl0

0 0 0 0.50 0 0 1 0.33 0 1 0 0.25 0 1 1 0.20 1 0 0 0.17 1 0 1 0.14 1 1 0 0.12 1 1 1 0.11

Table 7 Control bits for alphagain-DAC; note 1

alphagain4 alphagain3 alphagain2 alphagain1 alphagain0 CURRENT alphagain-DAC

0 0 0 0 0 3.125 µA 0 0 0 0 1 6.250 µA 0 0 0 1 0 9.375 µA

code 1 1 1 0 1 93.750 µA 1 1 1 1 0 96.900 µA 11111 100µA

GAIN INPUT CURRENT

ALPHA DETECTOR

100 µA (code + 1)/32

Note

1. The currents of all DACs is controlled by reference current (I

2000 Oct 30 9

). The given currents are valid at I

RREF

= −900 µA.

Philips Semiconductors Product speciﬁcation

Pre-ampliﬁers for CD-RW systems TZA1020; TZA1020A

8.1.4 CONTROL BYTE SUBADDRESS 01

Table 8 Control byte for algctrl switch functions

algctr6 algctr5 algctr4 algctr3 algctr2 algctr1 algctr0 DESCRIPTION

0000000POR state 0 − 0 −−−−current gain alpha CD-R

Aoc = 0alpha CD-R circuit power-off

0 − 1 −−−−current gain alpha CD-R

Aoc = 1alpha CD-R circuit power-on

1 − 0 −−−−current gain alpha CD-R

Aoc = 3alpha CD-R circuit power-off

1 − 1 −−−−current gain alpha CD-R

Aoc = 4alpha CD-R circuit power-on

− 0 −−−−−alpha peak detector normal mode

− 1 −−−−−alpha peak detector to level (test)

−−−0−−−CD-RW mode 1

−−−1−−−CD-RW mode 2

−−−−0−−alpha CD-R

−−−−1−−alpha CD-RW

−−−−−0 0 DALPHA gain = 0.25

−−−−−0 1 DALPHA gain = 0.50

−−−−−1 0 DALPHA gain = 0.75

−−−−−1 1 DALPHA gain = 1.00

8.1.5 C

Table 9 Control bits for tlngain

Table 10 Control bits for rengain

ONTROL BYTE SUBADDRESS 02

tlngain1 tlngain0 GAIN TLN SIGNAL

0 0 1.5 0 1 3.0 1 0 4.5 1 1 6.0

rengain DESCRIPTION

0 1 normal 1 1.3 self test

2000 Oct 30 10

Philips Semiconductors Product speciﬁcation

Pre-ampliﬁers for CD-RW systems TZA1020; TZA1020A

Table 11 Control bits for current negain-DAC; note 1

negain4 negain3 negain2 negain1 negain0 CURRENT negain-DAC

00000 3.125 µA 00001 6.250 µA 00010 9.375 µA

code

100 µA (code + 1)/32 11101 93.750 µA 11110 96.900 µA 11111 100µA

Note

1. The currents of all DACs is controlled by reference current (I

). The given currents are valid at I

RREF

8.1.6 CONTROL BYTE SUBADDRESS 03 Table 12 Control bit for tmdac

= −900 µA.

RREF

tmdac DESCRIPTION

0 DAC test off 1 DAC test on

Table 13 Control bits for tlnlimit

tlnlim1 tlnlim0 DESCRIPTION

0 0 clamp off X 1 clamp on 1 (0.6 V; T 1 0 clamp on 2 (1.2 V; T

amb amb

=25°C) =25°C)

Table 14 Control bits for current sumref-DAC; note 1

sumref4 sumref3 sumref2 sumref1 sumref0 CURRENT sumref-DAC

00000 0.468 µA 00001 0.937 µA 00010 1.40 µA

code

15 µA (code + 1)/32

11101 14.06 µA 11110 14.53 µA 11111 15.00 µA

Note

1. The currents of all DACs is controlled by reference current (I

2000 Oct 30 11

). The given currents are valid at I

RREF

= −900 µA.

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