SM8613AV
Laser Switching Driver IC
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
I
I
PINOUT
(Top view)
I
I
I
I
I
I
2.3V low-voltage supply operation
Intermittent-duty laser driver built-in (4-times
speed read, 38MHz max. intermittent output)
Laser switching frequency range: 8.6 to 38MHz
Fixed-current drive/intermittent-duty drive switch
function
Intermittent current duty ratio adjust function
Automatic power control (APC) function using
luminosity-monitoring photodiode (PD)
Low power dissipation
Package: 16-pin VSOP (lead-free)
LDISET
NC
MUTE
PCK
DUTY
PLSON
NC
VSS
1
16
RGAIN
NC
CGAIN
VDD
LDIOUT
LDON
NC
APPLICATIONS
I
8
9
PDVIN
Portable CD player
ORDERING INFORMATION
Device
SM8613AV
Package
16-pin VSOP
PACKAGE DIMENSIONS
(Unit: mm)
Weight: 0.07g
4.4 0.2
6.4 0.2
0.10 0.05
5.1 0.2
1.15 0.1
0.275typ
0.15
-
+ 0.1 5
0.0
0 to 10
0.65
0.10
+ 0.1
0.22
- 0.05
0.12
M
0.5 0.2
NIPPON PRECISION CIRCUITS INC.—1
SM8613AV
BLOCK DIAGRAM
VDD
LDISET
LDON
PLSON
MUTE
Processor
LDIOUT
R
LD
Pick-up
PCK
2 multiplier
Pulse control logic
Laser diode driver
DUTY
R
DUTY
Duty rate adjustor
Feedback
V-I amplifier
PDVIN
VSS
RGAIN
R
G
CGAIN
C
G
NIPPON PRECISION CIRCUITS INC.—2
SM8613AV
PIN DESCRIPTION
Number
1
2
Name
LDISET
NC
i/o
o
–
Description
LD drive maximum current setting resistor connection
No connection (must be open)
Intermittent-drive stop signal
MUTE
3
MUTE
ip
L
H
4
5
PCK
DUTY
i
o
Laser drive state
LD intermittent drive control (PLSON = H)
LD constant-current drive
Intermittent control reference pulse input
Intermittent-duty ratio adjust resistor connection
Intermittent-drive control signal
PLSON
Laser drive state
LD constant-current drive
LD intermittent drive control
6
PLSON
ip
L
H
7
8
9
10
NC
VSS
PDVIN
NC
–
–
i
–
No connection (must be open)
Ground (0V DC)
Laser luminosity monitor voltage input
No connection (must be open)
LD drive current control signal
LDON
Laser drive state
LD drive stop control (sleep mode)
LD drive ON
11
LDON
ip
L
H
12
13
14
15
16
LDIOUT
VDD
CGAIN
NC
RGAIN
o
–
o
–
o
LD drive current output
Supply voltage (2.5V DC)
APC frequency response control capacitor connection
No connection (must be open)
APC loop gain control resistor connection
ip: Built-in pull-down resistor
NIPPON PRECISION CIRCUITS INC.—3
SM8613AV
SPECIFICATIONS
Absolute Maximum Ratings
Parameter
Supply voltage
Input voltage
Input current
Operating temperature
Storage temperature
Power dissipation
Symbol
V
DD
V
IN
I
IN
T
OPR
T
STG
P
W
Rating
−
0.5 to 7.0
−
0.5 to V
DD
+
0.5
−
3.0 to
+
3.0
−
20 to 70
−
40 to 125
96
Unit
V
V
mA
°C
°C
mW
DC Electrical Characteristics
V
DD
=
2.5V, Ta
= +
25
°C
unless otherwise noted
Rating
Parameter
Guaranteed operating supply
voltage
Symbol
Condition
min
V
DD
PDVIN–LDIOUT short,
R
LDIOUT
= 4Ω, LDON = HIGH,
Excluding LDIOUT current
LDON
=
LOW
2.3
typ
2.5
max
3.3
V
Unit
Test
level
I
Current consumption
I
DD1
I
DD2
1.0
–
1.7
–
2.3
30
mA
µA
I
I
Input Specifications
V
DD
=
2.5V, Ta
= +
25
°C
unless otherwise noted
Rating
Parameter
PCK HIGH-level voltage
PCK LOW-level voltage
PCK HIGH-level sink current
LDON HIGH-level voltage
LDON LOW-level voltage
LDON HIGH-level sink current
PLSON HIGH-level voltage
PLSON LOW-level voltage
PLSON HIGH-level sink current
MUTE HIGH-level voltage
MUTE LOW-level voltage
MUTE HIGH-level sink current
Symbol
V
IHPCK
V
ILPCK
I
HPCK
V
IHLDON
V
ILLDON
I
HLDON
V
IHPLSON
V
ILPLSON
I
HPLSON
V
IHMUTE
V
ILMUTE
I
HMUTE
Condition
min
V
DD
×
0.7
–
–
V
DD
×
0.7
–
–
V
DD
×
0.7
–
–
V
DD
×
0.7
–
–
typ
–
–
–
–
–
–
–
–
–
–
–
–
max
–
V
DD
×
0.3
20
–
V
DD
×
0.3
20
–
V
DD
×
0.3
20
–
V
DD
×
0.3
20
V
V
µA
V
V
µA
V
V
µA
V
V
µA
Unit
Test
level
I
I
I
I
I
I
I
I
I
I
I
I
NIPPON PRECISION CIRCUITS INC.—4
SM8613AV
Electrical Characteristics
V
DD
=
2.5V, Ta
= +
25
°C
unless otherwise noted
Rating
Parameter
PCK minimum input frequency
PCK maximum input frequency
Intermittent current output frequency
range
LDON response time
Symbol
f
PCKMIN
f
PCKMAX
f
LD
t
LDON
LDON = LOW to HIGH,
I(LDIOUT) to 90%, C
G
= 6800pF
PLSON = LOW to HIGH (MUTE: LOW),
MUTE = HIGH to LOW (PLSON: HIGH),
until the duty ratio stabilizes
PLSON = HIGH to LOW (MUTE: LOW),
MUTE = LOW to HIGH (PLSON: HIGH)
PDVIN
=
0V
Condition
min
–
19
8.6
–
typ
–
–
–
–
max
4.3
–
38
110
MHz
MHz
MHz
µs
µs
Unit
Test
level
I
I
I
II
PLSON, MUTE response time 1
t
PLSON1
–
–
20
II
PLSON, MUTE response time 2
LDIOUT maximum output current
LDIOUT intermittent current rise time
LDIOUT intermittent current fall time
LDISET voltage
PDVIN convergence voltage
PDVIN input impedance
APC loop cutoff frequency
Minimum duty ratio
Maximum duty ratio
Minimum LD current ON time
t
PLSON2
I
LDMAX
t
LDIR
t
LDIF
V
LDISET
V
PDVIN
Z
PDVIN
f
APC
DR
MIN
DR
MAX
t
LDION
–
40
–
–
–
–
–
–
0.83
160
–
25
–
–
14
25
–
10
10
0.92
175
–
100
40
85
–
ns
mA
ns
ns
V
mV
MΩ
kHz
%
%
ns
II
I
II
II
I
I
II
I
I
I
II
1/3V
DD
R
G
=
33kΩ, V
DD
=
2.5V,
PDVIN–LDIOUT short, R
LDIOUT
= 20Ω
0.75
145
1
C
G
=
6800pF
PCK
=
4.3MHz, R
DUTY
=
15kΩ
PCK
=
4.3MHz, R
DUTY
=
5kΩ
–
20
55
–
Note 1) LDON has internal pull-down resistor.
Note 2) PLSON has internal pull-down resistor.
Note 3) MUTE has internal pull-down resistor.
Note 4) LDISET is in high-impedance state when LDON is HIGH.
Note 5) DUTY is in high-impedance state when LDON is HIGH.
Test level description
Test level I
Test level II
100% of devices tested at
+
25°C
Specifications guaranteed according to design and evaluation tests.
NIPPON PRECISION CIRCUITS INC.—5
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