SM8613

Manufacturer Part NumberSM8613
DescriptionCD Laser Driver
ManufacturerNippon_Precision_Circuits America
SM8613 datasheet
 
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OVERVIEW
The SM8613AV is a portable CD player laser diode (LD) driver IC. Conventional portable CD players use a
fixed-current LD drive method, but this increases the power dissipation and limits battery life. The SM8613AV
employs an intermittent LD driver duty operation to reduce the laser power dissipation, which greatly reduces
the current consumption when reading data and extends battery driver life.
FEATURES
2.3V low-voltage supply operation
I
Intermittent-duty laser driver built-in (4-times
I
speed read, 38MHz max. intermittent output)
Laser switching frequency range: 8.6 to 38MHz
I
Fixed-current drive/intermittent-duty drive switch
I
function
Intermittent current duty ratio adjust function
I
Automatic power control (APC) function using
I
luminosity-monitoring photodiode (PD)
Low power dissipation
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Package: 16-pin VSOP (lead-free)
I
APPLICATIONS
Portable CD player
I
ORDERING INFORMATION
Device
SM8613AV
PINOUT
(Top view)
LDISET
MUTE
DUTY
PLSON
PACKAGE DIMENSIONS
Package
(Unit: mm)
16-pin VSOP
Weight: 0.07g
0.275typ
0.65
SM8613AV
Laser Switching Driver IC
1
16
RGAIN
NC
NC
CGAIN
PCK
VDD
LDIOUT
LDON
NC
NC
VSS
8
9
PDVIN
5.1 0.2
0.10
+ 0.1
0.22
0.5 0.2
- 0.05
0.12
M
NIPPON PRECISION CIRCUITS INC.—1
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SM8613 Summary of contents

  • Page 1

    ... OVERVIEW The SM8613AV is a portable CD player laser diode (LD) driver IC. Conventional portable CD players use a fixed-current LD drive method, but this increases the power dissipation and limits battery life. The SM8613AV employs an intermittent LD driver duty operation to reduce the laser power dissipation, which greatly reduces the current consumption when reading data and extends battery driver life ...

  • Page 2

    ... BLOCK DIAGRAM LDON PLSON MUTE Processor PCK 2 multiplier DUTY Duty rate adjustor R DUTY VSS SM8613AV Pulse control logic Laser diode driver Feedback V-I amplifier RGAIN CGAIN NIPPON PRECISION CIRCUITS INC.—2 VDD LDISET R LD Pick-up LDIOUT PDVIN ...

  • Page 3

    ... APC frequency response control capacitor connection 15 NC – No connection (must be open) 16 RGAIN o APC loop gain control resistor connection ip: Built-in pull-down resistor SM8613AV Description MUTE Laser drive state L LD intermittent drive control (PLSON = constant-current drive PLSON Laser drive state L LD constant-current drive ...

  • Page 4

    ... IHPLSON PLSON LOW-level voltage V ILPLSON PLSON HIGH-level sink current I HPLSON MUTE HIGH-level voltage V IHMUTE MUTE LOW-level voltage V ILMUTE MUTE HIGH-level sink current I HMUTE SM8613AV Rating Unit − 0.5 to 7.0 V − − 3 3.0 mA − ° C − 125 ° ...

  • Page 5

    ... Note 5) DUTY is in high-impedance state when LDON is HIGH. Test level description 100% of devices tested ° C Test level I Test level II Specifications guaranteed according to design and evaluation tests. SM8613AV Condition LDON = LOW to HIGH, I(LDIOUT 6800pF G PLSON = LOW to HIGH (MUTE: LOW), ...

  • Page 6

    ... L Note) × : Don’t care. Frequency Multiplier Function and LD Drive Current Duty Ratio Setting The SM8613AV multiplies the PCK input frequency by 2, which is then used as the intermittent-drive refer- ence frequency. The intermittent drive LD current ON time is shown in the following figure. PCK I(LDIOUT) The intermittent current output from LDIOUT is automatically adjusted as the frequency changes to maintain the duty ratio almost constant ...

  • Page 7

    ... RGAIN and CGAIN. The PDVIN voltage to laser drive current open-loop gain is given approximately by the following equation. If the external resistor R is removed, the maximum gain [S] is selected. G APC Loop Cutoff Frequency Setting The APC loop cutoff frequency f APC pins. The same result occurs SM8613AV 40VDD × 120 = LD0 LDSET − ...

  • Page 8

    ... Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, including compliance with export controls on the distribution or dissemination of the products. Customers shall not export, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies. SM8613AV R LD ...