AN8725FH Datasheet, PDF (7/36 Pages) Panasonic Semiconductor – Semiconductor laser power control IC

ICs for Optical Disk Drive
AN8725FH
s Pin Descriptions (continued)
Pin No. Symbol Category
64
RDCP2 MSC A
65
LDRP OUT A
66
N.C.

67
N.C.

68
RV_CC
PS
A
69
LDPK OUT A
70
XLDPK IN A
71
PKGND PS A
72
PKV_CC
PS
A
73
PKDCP MSC A
74
LDBI OUT A
75
XLDBI IN
A
76
BIGND PS A
77
BIV_CC
PS
A
Description
Pin to connect a de-coupling capacitor to protect the output current of
DAC7, the read current setting circuit, from disturbance by a switching
noise such as peak current.
(Connects a capacitor between RDCP2 and RGND.)
Source type read current (DAC1, DAC7, DAC8, DAC9) output pin.
Possible to set up the range of 0 mA to 150 mA in the precision of 8-bit
+ 4-bit + 5-bit + 4-bit.
Output voltage range is 1.0 V to 3.5 V.
N.C. pin.
Open the pin or connect to GND.
Power supply pin for read current setting DAC7, DAC8.
Consumes approximately a quarter of the necessary read current.
Must be used in the same potential as other power supply pins.
Source-type peak current (DAC2) output pin.
Possible to set the range of 0 mA to 150 mA in the accuracy of 8-bit.
The output voltage range is 1.0 V to 3.2 V.
Sink-type peak current output pin.
Approximately three fourths of LDRK output current are outputted from
this pin.
GND pin of DAC2 in the peak current setting circuit.
Must be used in the same potential as other GND pins.
DAC2 power supply pin in the peak current setting circuit.
Consumes approximately a quarter of the setting current.
Must be used in the same potential as other power supply pins.
Pin to connect a de-coupling capacitor to avoid the output current disturbance,
which is caused by a switching noise such as peak current, in peak current
setting circuit DAC2.
(Connects a capacitor between PKDCP and PKGND.)
Source-type bias current (DAC3) output pin.
Possible to set the range of 0 mA to 150 mA in the accuracy of 8-bit.
Output voltage range is 1.0 V to 3.2 V.
Sink-type peak current output pin.
Approximately three fourths of LDBI output current are outputted from
this pin.
GND pin of a bias current setting circuit DAC3.
Must be used in the same potential as other GND pins.
Power supply pin of a bias current setting circuit DAC3.
Consumes approximately one fourth of a setting current.
Must be used in the same potential as other power supply pins.
7