CPF274ALK
Front Monitor OEIC for 3-wavelength laser

１．Product Overview
CPF274ALK is front monitor OEIC developed in order to control the laser power of the optical pickup for
BD/DVD/CD by one IC.
For serial interface are equipped, CPF274ALK is possible to select five gain switching mode(rough adjustment)
and ±4.7dB gain adjustment (fine adjustment).
Also, CPF274ALK is no need variable resistance of gain adjustment, so it can be cut number of components.
Since CPF274ALK is builds high-speed amplifier and the PIN photo diode, output impedance is low and obtainthe stable output.
By adoption of the COB-8PIN(1.8mm*1.8mm)package, it is best for small and a thin shape pickup.

２．Features
⚫

⚫
⚫
⚫
⚫
⚫
⚫

Gain Adjustment by serial data
Four gain switching mode (Gain Step 7dB)
±4.7dB Gain Adjustment (number of gain steps 64)
Sleep function by serial data
Frequency characteristic : 120[MHz] (BD/DVD)
High-speed amplifier built-in Tr/Tf : 4ns (BD/DVD)
Small, a thin shape and open photo detector package (1.8mm*1.8mm LKCOB-8PIN)
Solder re_flowing permitted
For free halogen

３．Maximum ratings

Item

SymbolRatings

Unit

Supply voltage

VCC

6.0V

Power dissipation

Pd240mW

Operating temperatureTopr-40 to +105

CStorage temperatureTstg-40 to +105

C

Terminal input voltage

Vimax

GND-0.3 to Vcc+0.3

V

４．Recommended operating conditions

Item

SymbolRatings

Unit

Supply voltage

VCC

5.0±0.5

V

Note： This document may be changed without prior notice. Please check the latest document for examination.
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CPF274ALK

Front Monitor OEIC for 3-wavelength laser

５．Block diagram

EN31SerialInterface

VCC

DATA 4

CLK

Gain_Adjustment_Amp

5

IV_Amp Gain SelectGain_Step 7dB

IV_Amp+8 OUTP

-7 OUTN

Gain_Adjustment_Amp Set up±4.7dB 64step
2

GND

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CPF274ALK

Front Monitor OEIC for 3-wavelength laser

６．Terminal function and equivalent circuit on terminal

NoSymbol

I/O

Terminal Function

Equivalent Circuit
VCC 1

1VCC-Power supply terminal

2

GND-Ground terminal

GND 2
VCC 1Internal3.3V

Serial interface
3ENEN 3I
Data Enable input terminal

50k
GND 2
VCC 1Internal
3.3V

Serial interface
4DATA

DATA 4I/O
Data input and output terminal

GND 2

VCC 1Internal
3.3V

Serial interface
5CLK

CLK 5I
Clock input terminal

50k
GND 2

6NC-NC pin

1 VCC

7OUTN

Negative output terminal
O8OUTP

407 OUTN
8 OUTP

Positive output terminal

2 GND

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CPF274ALK

Front Monitor OEIC for 3-wavelength laser

７．Serial interface
７．１ Timing chart

７．１．１

Timing chart of Write modeEN
CLKDATA

A7A6A5W

A4A3A2A1A0

D7D6D5D4Address

D3D2D1D0Data

Each function settings changes at the falling edge of EN.

.

７．１．２

Timing chart of Read modeEN
CLKDATA(HOST)A7RDATA(CPF274ALK)A6A5A4A3A2A1

A0

Hi-Z

Address(From Host)
D7Hi-Z

D6

D5D4D3D2D1

D0

Data Output(From CPF274ALK)

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CPF274ALKFront Monitor OEIC for 3-wavelength laser

７．２ Data Format
A7 : Read, Write Select Bit 0:Write 1:Read
A6 to A0 : Address Bit (A6:MSB, A0:LSB)
７．３

D7 to D0 : Data Bit (D7:MSB, D0:LSB)

Address map
Address (A6-A0)

Function

71h[Gsel] IV_Amp Gain Select[Gadj] Gain_Adjustment_Amp Gain Set up

72h[Gsel2] IV_Amp Gain Select2[Sleep] Sleep Mode Select

７．４ Bit map
７．４．１

Address 71h

D7

D6

D5

D4

D3

D2

D1

D0

Gsel1

Gsel0

Gadj5

Gadj4

Gadj3

Gadj2

Gadj1

Gadj0

D7-D6 IV_Amp Gain Select [Gsel]
D7

D6IV_Amp Gain Select00+21dB

01+14dB

10+7dB

11+0dB

D5-D0 Gain_Adjustment_Amp Set up [Gadj]
D5

D4

D3

D2

D1

D0000000

Gain_Adjustment_Amp Gain
+4.7dB・・・・・・・

10

1000

1

1

1

1

1

10dB
・・・・・・・

７．４．２-4.7dB

Address 72h

D7

D6

D5

D4

D3

D2

D1

D0－－－－Gsel2－－Sleep

D3 IV_Amp Gain Select2 [Gsel2]
D3IV_Amp Gain Select2

0+0dB

1-7dB

D0 Sleep Mode Select [Sleep]
D0Mode0Active

1Sleep (OUTP,OUTN become high impedance)

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CPF274ALKFront Monitor OEIC for 3-wavelength laser

７．５ IV_Amp Gain setting list
72h [Gsel2]

71h [Gsel]

D3

D7

D6

IV_Amp Gain000

HH ( +21dB )00

1

HL ( +14dB )010

LH ( +7dB )

011

LL ( +0dB )

100

HL ( +14dB )101

LH ( +7dB )110

LL ( +0dB )111LLL ( -7dB )７．６ Set up DC Sensitivity

７．７ Operating precautions
Because this IC can be in sleep condition at power-on, be sure to set registers to cancel sleep condition.
In case that gain is set to low sensitivity, it may cause damage to laser.
To avoid this, set gain with registers before turning on laser

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CPF274ALK

Front Monitor OEIC for 3-wavelength laser

８．Electrical and optical characteristics
Measurement condition : VCC=5.0V, Ta=25C, RL=10kΩ, CL=10pF
Optical input : semiconductor laser. Position of optical input : Center of PD
８．１

Size of optical input : 400μmΦ

IV Amp, Gain Adjustment Amp
ItemSymbol

IV_Amp
Gain
HHHL
LH
LL
LLL

Gain
Adjustment
Amp Gain

0dB-Condition

MIN

TYP

MAX

Unit

No input optical power-25%-25%-25%-25%-25%

19.1
18.3
18.1
20.2
20.2

+25%+25%+25%+25%+25%mA

No input optical power

-0.5

0.8mA

No input optical power
GND reference

1.6

1.7

1.8V

No input optical power-15015mVConsumption current

ICC

Sleep mode
consumption current

ICCS-OUTP,OUTN
output reference voltage

VREF

ALL

OUTP - OUTN
offset voltage

DVOF

ALL

OUTP - OUTN offset
voltage temperature drift *1

TVOF

ALL

-4.7dB
0dB+4.7dBNo input optical power-40040μV/C

OUTP - OUTN
frequency response(405nm, 650nm) *1

FC

ALL

+4.7dB
0dB-4.7dB

λ=405nm, 650nm
1MHz reference –3dB

80120-MHzOUTP - OUTN
frequency response(780nm) *1

FC

ALL+4.7dB
0dB-4.7dB

λ=780nm1MHz reference –3dB

65100-MHzALL+4.7dB
0dB-4.7dB

Output Amplitude ：2.0VP-P
Rise(fall)time
λ=405nm, 650nm

－46ns

ALL

+4.7dB
0dB-4.7dB

Output Amplitude ：2.0VP-P
Rise(fall)time
λ=780nm

－4.5

6.5ns

MVP

HH

+4.7dBGND reference

2.9

3.1－

V

MVN

HH

+4.7dBGND reference

－0.5

0.6V

DCS

HH
HL
LH
LL
LLL
HH
HL
LH
LL
LLL
HH
HL
LH
LL
LLL

-25%-25%-25%-25%-25%-25%-25%-25%-25%-25%-25%-25%-25%-25%
-25%

7.833
3.499
1.563
0.698
0.312
12.02
5.368
2.398
1.071
0.478
11.25
5.024
2.244
1.002
0.448

+25%+25%+25%+25%+25%+25%+25%+25%+25%+25%+25%+25%+25%+25%+25%

OUTP - OUTN
pulse response characteristic(405nm, 650nm) *1
OUTP - OUTN
pulse response characteristic(780nm) *1
OUTP output
maximum voltage *1
OUTN output
maximum voltage *1

OUTP - OUTN
DC sensitivity *1

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TrTfTrTf+4.7dB
0dB-4.7dB-4.7dB
0dB+4.7dB0dB

λ=405nm0dB

λ=650nm0dB

λ=780nm

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mV/μW

mV/μW

mV/μW

CPF274ALK

Front Monitor OEIC for 3-wavelength laser

Item

SymbolIV_AmpGain

Gain
Adjustment
Amp Gain

OUTP - OUTN
maximum DC sensitivity *1

DCSMAX

HH+4.7dB

OUTP - OUTN
minmum DC sensitivity *1

DCSMIN

LLL-4.7dB

TDCS

ALL
ALL
ALL

0dB
0dB
0dB

GAJ--GS

HH-HL
HL-LH
LH-LL
LL-LL
L

DG
ZOUT

OUTP - OUTN
DC sensitivity
temperature drift *1*3
Gain adjustment range of
Gain_adjustment_Amp

IV_Amp Gain step

Gain_Adjustment_Amp
Gain step accuracy *1
OUTP, OUTN
Output Impedance *1Condition

MINTYP

MAX

10.15
15.57
14.57
-0.15
-0.15
-0.15

13.53
20.76
19.43
0.181
0.278
0.261
-0.09
-0.07
0.035

0.227
0.348
0.326
0.15
0.15
0.15

-±4.2

±4.7

±5.2

dB

--

6.3

7.0

7.7

dB--*2-50050%

LLL0dB

-28

4052

Ω

λ=405nmλ=650nm
λ=780nm
λ=405nmλ=650nm
λ=780nm
λ=405nmλ=650nm
λ=780nm*1 :It is design guarantee item

*2 :Gain_step = { Gain(0) - Gain(63) } / 63Gain(0) : Gain_Adjustment_Amp Setup 71h(D5-D0) >>>000000
Ex. Accuracy of Gain_Step (between 31 to 32)
DG(between 31 to 32)= { Gain(31) - Gain(32) } / Gain_step - 1*3: DC sensitivity temperature drift (TYP)*Ta = 25°C reference

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UnitmV/μW

mV/μW%/C%/C%/C

CPF274ALK

８．２

Front Monitor OEIC for 3-wavelength laser

Serial interface (DC)
ItemHigh level input voltage

Symbol

MIN

TYP

MAX

Unit

VIH

2.4-VCC

VCondition

Low level input voltage

VIL0-

0.6V

High level input current1

IIH1

4666

86μA

VIH=3.3V P3,5High level input current2

IIH2-10-10μA

VIH=3.3V P4

Low level input current

IIL-10-

10μA

VIL=0VHigh level output voltage 1

VOH1

2.9

3.3

3.7

V

IOH=0mA

High level output voltage 2

VOH2

2.3

3.7

V

IOH=1mA

Low level output voltage

VOL01V

IOL=1mA

８．３

Serial interface (AC)８．３．１

WriteEN(HOST)

Tcc
t5

CLK(HOST)

t6t1 t2

t7

90%
50%
10%t3 t4DATA(HOST)

A7 A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0

Symbol

Item

MIN

TYP

MAX

Unit

CLK

CLK frequency *--

20MHz

Tcc

CLK cycle

*50-

-

nst1

CLK “H” pulse width *

15-

-

nst2

CLK “L” pulse width *15-

-

nst3

DATA setup time *15-

-

nst4

DATA hold time *15-

-

nst5

EN setup time *15--nst6EN hold time *1/CLK--st7

EN “L” time *100--ns* : It is design guarantee item

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CPF274ALK
８．３．２

Front Monitor OEIC for 3-wavelength laser

ReadEN(HOST)

Tcc
t5

CLK(HOST)

t1 t2

t6t7

90%50%10%
t3 t4

DATA(HOST)Hi-Z

A7 A6 A5 A4 A3 A2 A1 A0
t8

Hi-Z

DATA
(CPF274ALK)t9

D7 D6 D5 D4 D3 D2 D1 D0SymbolItemMINTYPMAXUnit

CLKCLK frequency *--5MHzTcc

CLK cycle

*200-

-

nst1

CLK “H” pulse width *90-

-

nst2

CLK “L” pulse width *90

-

-

nst3

DATA setup time *90

-

-

nst4

DATA hold time *90

-

-

nst5

EN setup time *90

-

-

nst6

EN hold time *1/CLK--st7

EN “L” time *100-

-

nst8

DATA output delay time *-

-

90

nst9

DATA output hold time

--90

ns*

* : It is design guarantee item

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CPF274ALK

Front Monitor OEIC for 3-wavelength laser

９．Exterminal dimensions

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CPF274ALK
１０．

Front Monitor OEIC for 3-wavelength laser

Dimensions and Location of Photo Detector

0.9±0.15(PD Center)

Photo Detector：450umφ1.8±0.1

0.95±0.15(PD Center)#1

1.8±0.1

Unit : mm
Tilt : ±2

１１．

Reference land pattern

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Front Monitor OEIC for 3-wavelength laser

To Customers:
If any product described in this document corresponds to goods or technologies which are restricted to export under theJapanese “Foreign Exchange and Foreign Trade Control Law” or other applicable laws of a government having
jurisdiction, then, appropriate permission for exporting such products or technologies are required to be taken.
In relation to use of the information contained in this document, no license is granted to you with regard to any
intellectual property rights of YITOA MICRO TECHNOLOGY CORPORATION (hereinafter referred to as "MTC") or
any third party. MTC will not be liable in any way for any claim related to infringement of intellectual property rights
or other rights of third parties arising from the use of the information contained in this document.
The information concerning the circuits and other related information contained in this document is provided forreferential purpose only to explain the operation or application of the products, and it will be your sole responsibility touse such information for designing of your own devices. MTC will not be liable in any way for any loss or damages
incurred to you or any other party arising from the use of such information.
In general, failures in semiconductor products occur at certain percentage. Therefore, upon designing your own devices,
please give due consideration to the redundancy, safety of your devices and methods to prevent occurrence ofmalfunction in order to avoid personal injuries, accidents or other social damages which might happen as the result of a
failure of semiconductor products used in your devices.
For application of MTC products to medical equipment or other purposes where high reliability of the device is required,please contact MTC sales representative.
The contents of this documents may be subject to change without any notice, due to improvement of reliability or designof the products.
It is inhibited to reproduce or copy the whole or part of this document without the permission of MTC.

YITOA Micro Technology Corporation
Office:465 OSATO-CHO KOFU-SHI YAMANASHI-KEN 400-0053 JAPANTEL: +81-55-241-8622
FAX:

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