Analog Signal Processor (ASP)

for CD players

Overview

The LA9240M is an analog signal processing and servo control
bipolar IC designed for use in compact disc players; a compact
disc player can be configured by combining this IC with a
CD-DSP such as the LC78622E and LC78620E, with a small
number of additional components required.

Functions

I/V amplifier, RF amplifier (with AGC), SLC, APC, FE, TE
(with VCA and auto-balance function), focus servo amplifier
(with offset cancellation function), tracking servo amplifier
(with offset cancellation function), spindle servo amplifier
(with gain switching function), sled servo amplifier (with off
function), focus detection (DRF, FZD), track detection (HFL,
TES), defect detection, and shock detection.

Features

The following automatic adjustment functions are built in.

Focus offset auto cancel: FE (pin 20)

Tracking offset auto cancel: TE (pin 7)

EF balance auto adjustment

RF level AGC function

Tracking servo gain RF level following function

Focus search smoothing setting pin: FSC (pin 46)

EF balance adjustment variable range setting pin: TBC (pin
47)

Focus search mode switching pin: FSS (pin 55)

Package Dimensions

unit : mm

3159-QFP64E

[LA9240M]

SANYO : QIP64E

Specifications

Maximum Ratings

at Ta = 25°C, Pins 22, 45 = GND

Parameter

Symbol

Conditions

Ratings

Unit

Maximum supply voltage

max

Pin 56, 64

Allowable power dissipation

Pd max

350

Operating temperature

Topr

25 to +75

°C

Storage temperature

Tstg

40 to +150

°C

Ordering number: EN 5482A

Monolithic Linear IC

LA9240M

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

83097HA(II)/83096HA(II) No.5482 - 1/20

Operating Conditions

at Pins 22, 45 = GND

Parameter

Symbol

Conditions

Ratings

Unit

Recommended supply voltage

Operating supply voltage

3.6 to 5.5

Operating Supply Voltage at Limit of Operating Temperature

at Pins 22, 45 = GND

Parameter

Symbol

Conditions

Ratings

Unit

Operating temperature

Topr2

5 to +75

°C

Operating supply voltage

op2

Set resistance R between DSP and
CLK interface to 5.1 k

3.4 to 5.5

Operating Characteristics

at Ta = 25°C, Pins 22, 45 = GND, V

(pins 56, 64) = 5 V

Parameter

Symbol

Conditions

min

typ

max

Unit

Current drain

CCO

1 (pin 64) + V

2 (pin 56)

Reference voltage

REF

2.3

2.5

2.7

[Interface]

CE-Vth

CEvth

0.8

CL-Vth

CLvth

0.8

DAT-Vth

DATvth

DAT

0.8

Maximum CL frequency

CLmax

500

kHz

[RF amplifier]

RFSM no signal voltage

RFSMo

1.35

1.60

1.85

Minimum gain

RFSM

min

FIN1, FIN2 : 1 M

-input, PH1 = 4 V

freq = 200 kHz, RFSM

14.0

12.5

11.0

[Focus amplifier]

FDO gain

FIN2 : 1 M

-input, FDO

3.5

5.0

6.5

FDO offset

FDost

Difference from reference voltage, servo on

170

+170

Off time offset

FDofost

Difference from reference voltage, servo off

+40

Offset adjustment step

FEstep

F search voltage H1

FSmax1

FDO, FSS = GND

0.8

F search voltage L1

FSmin1

FDO, FSS = GND

0.8

F search voltage H2

FSmax2

FDO, FSS = V

0.8

F search voltage L2

FSmin2

FDO, FSS = V

[Tracking amplifier]

TE gain MAX

max

f = 10 kHz, E: 1 M

-input, PH1 = 4 V

6.0

7.5

9.0

TE gain MIN

min

f = 10 kHz, E: 1 M

-input, PH1 = 1 V

0.5

+1.8

+4.0

TE-3 dB

TEfc

E: 1 M

-input

kHz

TO gain

TO gain, THLD mode

4.0

6.0

8.0

TGL offset

TGLost

Servo on, TGL = H, TO

250

+250

TGH offset

TGHost

TGL = L, difference from TGL offset, TO

+50

THLD offset

THLDost

THLD mode, difference from TGL offset, TO

+50

Off 1 offset

OFF1ost

TOFF = H

+50

Off 2 offset

OFF2ost

TOFF2 off (IF)

+50

Offset adjustment step

TEstep

Balance range H

BAL-H

Gain E/F input, TB = 5 V, TBC = open

3.5

Balance range L

BAL-L

Gain E/F input, TB = 0 V, TBC = open

3.5

TOFF-VTH

TOFFvth

1.0

2.5

3.0

TGL-VTH

TGLvth

1.0

2.5

3.0

[PH]

No signal voltage

PHo

Difference from RFSM

0.85

0.65

0.45

[BH]

No signal voltage

BHo

Difference from RFSM

0.45

0.65

0.85

[DRF]

Detection voltage

DRFvth

Difference from VR at RFSM

0.60

0.35

0.20

Output voltage H

DRF-H

4.5

4.9

Output voltage L

DRF-L

+0.5

Continued on next page.

LA9240M

No.5482 - 2/20

Continued from preceding page.

Parameter

Symbol

Conditions

min

typ

max

Unit

[FZD]

Detection voltage 1

FZD1

FE, difference from VR

+0.2

Detection voltage 2

FZD2

FE, difference from VR

[HFL]

Detection voltage

HFLvth

Difference from VR at RFSM

0.55

0.4

0.25

Output voltage H

HFL-H

4.5

4.9

Output voltage L

HFL-L

+0.5

[TES]

Detection voltage LH

TES-LH

TESI, difference from VR

0.15

0.10

0.05

Detection voltage HL

TES-HL

TESI, difference from VR

0.05

0.10

0.15

Output voltage H

TES-H

4.5

4.9

Output voltage L

TES-L

+0.5

[JP]

Output voltage H

JP-H

Difference from JP

= 0 V, JP

= 0 V at JP

= 0 V,

= 5 V, TO

0.35

0.5

0.65

Output voltage L

JP-L

Difference from JP

= 0 V, JP

= 0 V at JP

= 5 V,

= 0 V, TO

0.65

0.5

0.35

[Spindle amplifier]

Offset 12

SPD12ost

Difference from VR at SPD, 12 cm mode

+40

Offset 8

SPD8ost

Difference from VR at SPD, 8 cm mode

+40

Offset off

SPDof

Difference from VR at SPD, OFF mode

+30

Output voltage H12

SPD-H12

Difference from offset-12, 12 cm mode
CV

= 5 V, CV

= 0 V

0.75

1.0

1.25

Output voltage L12

SPD-L12

Difference from offset-12 , 12 cm mode
CV

= 0 V, CV

= 5 V

1.25

1.0

0.75

Output voltage H8

SPD-H8

Difference from offset-8, 8 cm mode
CV

= 5 V, CV

= 0 V

0.35

0.5

0.65

[Sled amplifier]

SLEQ offset

SLEQost

Difference from TO at SLEQ

+30

Offset SLD

SLDost

SLEQ = VR, Difference from VR

100

+100

Offset off

SLDof

Off mode

+40

Off VTH

SLOFvth

SLOF

1.0

1.4

2.0

[SLC]

No signal voltage

SLCo

SLC

2.25

2.5

2.75

[Shock]

No signal voltage

SCIo

SCI, difference from VR

+40

Detection voltage H

SCIvthH

SCI, difference from VR

100

140

Detection voltage L

SCIvthL

SCI, difference from VR

140

100

[DEF]

Detection voltage

DEFvth

Difference between LF2 voltage when RFSM =
3.5 V and DEF is detected and LF2 voltage when
RFSM = 3.5 V

0.20

0.35

0.50

Output voltage H

DEF-H

4.5

4.9

Output voltage L

DEF-L

+0.5

[APC]

Reference voltage

LDS

LDS voltage at which LDD = 3 V

150

180

210

Off voltage

LDDof

LDD

3.9

4.3

4.6

LA9240M

No.5482 - 3/20

Pin Functions

No.

Symbol

Contents

FIN2

Pickup photodiode connection pin. Added to FIN1 pin to generate the RF signal, subtracted from FIN1 pin to generate
the FE signal.

FIN1

Pickup photodiode connection pin.

Pickup photodiode connection pin. Subtracted from F pin to generate the TE signal.

Pickup photodiode connection pin.

TE signal DC component input pin.

Pin which connects the TE signal gain setting resistor between this pin and TE pin.

TE signal output pin.

TESI

TES (Track Error Sense) comparator input pin. The TE signal is input through a bandpass filter.

SCI

Shock detection input pin.

Tracking gain time constant setting pin.

TA amplifier output pin.

Pin for configuring the tracking phase compensation constant between the TD and VR pins.

Tracking phase compensation setting pin.

Tracking jump signal (kick pulse) amplitude setting pin.

Tracking control signal output pin.

Focusing control signal output pin.

Pin for configuring the focusing phase compensation constant between the FD and FA pins.

Pin for configuring the focusing phase compensation constant between the FD

and FA

pins.

Pin for configuring the focusing phase compensation constant between the FA and FE pins.

FE signal output pin.

Pin which connects the FE signal gain setting resistor between this pin and FE pin.

AGND

Analog signal GND.

and CV

pins input signal single-end output.

SPI

Spindle amplifier input.

SPG

12-cm spindle mode gain setting resistor connection pin.

Spindle phase compensation constant connection pin, along with the SPD pin.

SPD

Spindle control signal output pin.

SLEQ

Sled phase compensation constant connection pin.

SLD

Sled control signal output pin.

Input pin for sled movement signal from microprocessor.

Input pin for tracking jump signal from DSP.

TGL

Input pin for tracking gain control signal from DSP. Gain is low when TGL is high.

TOFF

Input pin for tracking off control signal from DSP. Tracking servo is off when TOFF is high.

TES

Output pin for TES signal to DSP.

HFL

The High Frequency Level is used to determine whether the main beam is positioned over a bit or over the mirrored
surface.

SLOF

Sled servo off control input pin

Input pin for CLV error signal from DSP.

RFSM

RF output pin.

RFS

RF gain setting and EFM signal 3T compensation constant setting pin, along with the RFSM pin.

SLC

Slice Level Control is an output pin that controls the data slice level used by the DSP for the RF waveform.

SLI

Input pin used by DSP for controlling the data slice level.

DGND

Digital system GND pin.

FSC

Focus search smoothing capacitor output pin.

TBC

Tracking balance control; EF balance adjustment variable range setting pin

No connection

DEF

Disc defect detection output pin.

CLK

Reference clock input pin. 4.23 MHz signal from the DSP is input.

Microprocessor command clock input pin.

Continued on next page.

LA9240M

No.5482 - 4/20

Description of Operation

APC (auto laser power control)
This circuit controls the pickup laser power. The laser is turned on and off by commands from the microprocessor.

RF amplifier (eye pattern output)
The pickup photodiode output current (A + C) is input to FIN2 (pin 1), and (B + D) is input to FIN1 (pin 2). The current that
is input is converted to the voltage, passes through the AGC circuit, and is then output from the RFSM amplifier output
RFSM (pin 41). The internal AGC circuit has a variable range of ±3 dB, and the time constant can be changed through the
external capacitor connected to PH1 (pin 60). In addition, this circuit also controls the bottom level of the EFM signal
(RFSM output), and the response can be changed through the external capacitor connected to BH1 (pin 61). The center gain
setting for the AGC variable range is set by the resistance between RFSM (pin 41) and RFS

(pin 42); if necessary, this

resistance is also used for 3T compensation for the EFM signal.

SLC (slice level control)
The SLC sets the duty ratio for the EFM signal that is input to the DSP to 50%. The DC level is determined by integrating
the EFMO signal output from the DSP to determine the duty factor.

Focus servo
The focus error signal is derived by detecting the difference between (A + C) and (B + D), which is (B + D) - (A + C), and
is then output from FE (pin 20). The focus error signal gain is set by the resistance between FE (pin 20) and FE

(pin 21).

Offset cancellation is performed by the FE amplifier. ``Offset cancellation'' cancels the offset for the IC's internal IV
amplifier, etc. Adjustment is initiated by the FOCUS-OFFSET ADJUST START command, and terminates after about 30 ms.
The FOCUS-OFFSET ADJUST OFF command is used to return to the state before offset cancellation.
The FA amplifier is the pickup phase compensation amplifier, and the equalizer curve is set by the external capacitor and
resistance. Furthermore, this amplifier has a mute function which is applied when V

is turned on, when the F-SERVO OFF

command is sent, and during F-SEARCH. In order to turn the focus servo on, send either the LASER ON command or the
F-SERVO ON command.
The FD amplifier has a phase compensation circuit, and a focus search signal composition function and is completed in about
560 ms. Focus search is initiated by the F-SEARCH command, and a ramp waveform is generated by the internal clock. This
waveform is used for focus detection (focus zero cross) with the focus error signal and then turn the focus servo on. The
ramp waveform amplitude is set by the resistance between FD (pin 16) and FD

(pin 17).

FSC (pin 46) is for smoothing the focus search ramp waveforms, and a capacitor is connected between FSC and REF. FSS
(pin 55) is the focus search mode switching pin. If FSS is shorted with V

, the ``+ search'' is set; if FSS is left open or is

shorted with GND, the ``

search'' is set.

Tracking servo
The pickup photodiode output current is input to E (pin 3) and F (pin 4). The current that is input is converted to the voltage,
passes through the balance adjustment VCA circuit and then the VCA circuit that follows the gain in the RFAGC circuit, and
is then output from TE (pin 7). The tracking error gain is set by the resistance between TE

(pin6) and TE (pin7).

Offset cancellation is performed by the TE amplifier. Offset cancellation terminates after about 30 ms. The TRACK-OFFSET
ADJUST OFF command is used to return to the state before the offset.
The TH amplifier alters the servo response characteristics according to the THLD signal, etc., generated internally after
detection of the TGL signal from the DSP or the JP signal. When a defect is detected, the THLD mode goes into effect
internally. To avoid this, short DEF (pin 49) to L = GND. By inserting an external bandpass filter to remove the shock
component from the tracking error signal at SCI (pin 9), the gain is automatically boosted when a defect is detected.
The TA output (pin 11) has a built-in resistance to allow configuration of a low-pass filter.
The TD amplifier performs servo loop phase compensation; the characteristics are set by external CR. Furthermore, this
amplifier has a mute function, which is applied when V

is turned on or the TRACK-SERVO OFF command is issued. The

muting function is released by the TRACK-SERVO ON command.
The TOFF amplifier that is positioned immediately after TD (pin 13) functions to turn off the servo in response to the TOFF
signal from the DSP.
The TO amplifier has a JP pulse composition function. The JP pulse is set by JP (pin 14). (THLD detection is performed
internally.)

Sled servo
The response characteristics are set by SLEQ (pin 28). The amplifier positioned after SLEQ (pin 28) has a mute function that
is applied either when SLOF (pin 38) goes high or the SLED OFF command is issued. The sled is moved by inputting
current to SL

(pin 30) and SL

(pin 31); specifically, the pins are connected to the microprocessor output ports via resistors,

and the movement gain is set by the resistance value of that resistor. It is important to note that if there is a deviation in the
resistance values for SL

(pin 30) and SL

(pin 31), an offset will arise in the SLD output.

Spindle servo
This configures the servo circuit, which maintains the linear velocity of the disc at a constant speed, along with the DSP. This
circuit accepts signals from the DSP through CV

(pin 39) and CV

(pin 40) and sets the equalizer characteristics through SP

(pin 23), SP

(pin 26), and SPD (pin 27), which are output to SPD (pin 27). The 12-cm mode amplifier gain is set by the

resistor connected between SPG (pin 25) and the reference voltage. In 8-cm mode, this amplifier serves as an internal buffer,
and SPG (pin 25) is ignored. Note that the gain setting is made for 8-cm mode first, and then 12-cm mode. If SPG (pin 25)
is left open, the gain is forcibly set for 8-cm mode, regardless of whether 8-cm or 12-cm mode is in effect.

LA9240M

No.5482 - 8/20

11. DEFECT

The mirrored surface level is maintained by the capacitor for LF2 (pin 59); when a drop in the EFM signal (RFSM output)
reaches 0.35 V or more, a high signal is output to DEF (pin 49). If DEF (pin 49) goes high, the tracking servo enters THLD
mode. In order to prevent the tracking servo from entering THLD mode when a defect is detected, prevent DEFECT from
being output by either shorting DEF (pin 49) to GND, or shorting LF2 (pin 59) to GND. The DEFECT output is driven by
constant current (approximately 100 µA).

12. Microprocessor interface

Because the Reset (Nothing) command initializes the LA9240M, it must be used carefully.
The LA9240M command acceptance (mode switching) timing is defined by the internal clock (4.23 MHz divided to 130 kHz)
after the falling edge of CE (RWC); therefore, when commands are sent consecutively, CE must go low for at least 10 µsec.
The 4.23 MHz clock is required for that reason. 2BYTE-COMMAND DETECT and 2BYTE-COMMAND RESET are used
only for the purpose of masking two-byte data.
All instructions can be input by setting CE high and sending commands synchronized with the CL clock from the
microprocessor to DAT (pin 52) in LSB first format. Note that the command is executed at the falling edge of CE.

13. Reset circuit

The power-on reset is released when V

exceeds approximately 2.8 V.

14. Pattern design notes

To prevent signal jump-in from CV

(pin 40) to RFSM (pin 41), a shielding line is necessary in between.

15. V

/REF/GND/NC

1 (pin 64)

: RF system

2 (pin 56)

: SERVO system, DIGITAL system

AGND (pin 22)

: RF system, SERVO system

DGND (pin 45)

: DIGITAL system

NC (pin 48)

: No connection

VR (Pin 58)

: Reference voltage

EFM signal
(RFSM output)

LF2 (pin 59)

DEF (pin 49)

Timing

* The DSP pin names are shown in parentheses.

LA9240M

No.5482 - 10/20

Microprocessor Command List

MSB

LSB

COMMAND

Reset mode

Power-on mode

DSP

0 0 0 0 0 0 0 0

RESET

RESET(NOTHING)

0 0 0 0 1 0 0 0

FOCUS START

FOCUS START #1

1 1 1 1 0 0 0 0
1 1 1 1 1 0 0 0
1 1 1 1 1 1 1 1

2BYTE-COMMAND DETECT
2BYTE-COMMAND DETECT
2BYTE-COMMAND RESET

1 0 0 1 0 0 0 0

FOCUS-OFFSET ADJUST START

1 0 0 1 0 0 0 1

FOCUS-OFFSET ADJUST OFF

1 0 0 1 0 0 1 0

TRACK-OFFSET ADJUST START

1 0 0 1 0 0 1 1

TRACK-OFFSET ADJUST OFF

1 0 0 1 0 1 0 0
1 0 0 1 0 1 0 1

LASER ON
LASER OFF : F-SERVO ON

--
--

1 0 0 1 0 1 1 0

LASER OFF : F-SERVO OFF

1 0 0 1 0 1 1 1

SPINDLE 8CM

1 0 0 1 1 0 0 0

SPINDLE 12 CM

1 0 0 1 1 0 0 1

SPINDLE OFF

1 0 0 1 1 0 1 0

SLED ON

1 0 0 1 1 0 1 1

SLED OFF

1 0 0 1 1 1 0 0

E/F BALANCE START

Non-adjusted

1 0 0 1 1 1 0 1

TRACK-SERVO OFF

1 0 0 1 1 1 1 0

TRACK-SERVO ON

Notes Concerning Microprocessor Program Creation

Commands
After sending the FOCUS START command and the E/F BALANCE START command, send 11111110 (FEH) in order to
clear the internal registers of the IC.
Reason: Although the above commands are executed at point 1 in the timing chart below, the same commands will be

executed again at point 2 if there is subsequent input to CE as shown below.

When sending a TRACK-OFFSET ADJUST START command or a FOCUS-OFFSET ADJUST START command after either
V

ON (POWER ON RESET), RESET command, or a corresponding OFFSET ADJUST OFF command, waiting time is

necessary as listed below. (Only when a 4.2 MHz clock is input.)

TRACK-OFFSET ADJUST START: 4 ms or more
FOCUS-OFFSET ADJUST START: 4 ms or more

E/F balance adjustment
E/F balance adjustments should be made in a bit region of the disc, not a mirrored region.
Since there is no track-kick for LA9240M, measures must be taken during EF balance adjustment to obtain a stable TE
signal. (By a sled movement signal from a microprocessor, for example.)

Timing

2 µs or more

1 µs or more

10 µs or more

1 µs or more

2 µs or more

``FOCUS START'' command

``E/F BALANCE START'' command

LA9240M

No.5482 - 11/20

No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,
nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or
indirectly cause injury, death or property loss.

Anyone purchasing any products described or contained herein for an above-mentioned use shall:

Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors
and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and
expenses associated with such use:

Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.

Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume
production. 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 August, 1997. Specifications and information herein are subject to change without notice.

LA9240M

No.5482 - 20/20

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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: LA9240M