AN8725FH Datasheet, PDF (2/36 Pages) Panasonic Semiconductor – Semiconductor laser power control IC

AN8725FH
s Block Diagram
ICs for Optical Disk Drive
IGND ⁴⁰
35
AGND ₅₄
PKMD ⁴
BIMD ⁵
RPHOLD ⁶
XWR ⁸
XRD ⁹
AD0 ¹¹
AD1 ¹²
AD2 ¹³
AD3 ¹⁴
15
DT0
16
DT1
17
DT2
18
DT3
22
DT4
23
DT5
24
DT6
25
DT7
26
XLDEN
27
XCLR
29
XLDERR
32
XHFON
Playback
4
current
DAC7
Playback
5 current
LPF9
DAC9 _{LPF off}
Playback
4
current
DAC8
Playback
8 current
LPF1
DAC1
LPF off
Peak
8
current
DAC2
Peak bias
4
current
DAC4
Bias
8
current
DAC3
DAC3 DAC2 DAC8 DAC7
SW1
44 _LPF92
43 _LPF91
SW1
65 _LDRP
SW2
Current
amplification
39 _LPF12
38 _LPF11
70 _XLDPK
69
LDPK
SW3
Current
amplification
75 _XLDBI
74 _LDBI
Control
logic
X1/SX2 changeover
AAF off
AAF RST
CTL SW6
Shunt circuit
SW5
DAC1 DAC9 DAC4
Current source for DAC
PS over _{Supply voltage}
PS down _monitoring
WPW over
WPW down
RPW over
RPW down
Sleep
Insufficient
4 light emission
DAC5
Excessive
4 light emission
DAC6
Abnormal
light
emitting
detection
DAC56SW
I/V
conversion
Current
amplification
X1, X10
AAF
SW6
Buffer
Sleep circuit
Reference
voltage source
(1.25 V)
51 _IPD
50
IVIN
49 _IVOUT
48 _AAF
47
PWRMONI
46
DETMONI
56 _VNR
36
VC
53 _CVCC
52 _CGND
34
9 DV_CC
33
28
19
10 ^DGND
3
2
2