AN8725FH Datasheet, PDF (6/36 Pages) Panasonic Semiconductor – Semiconductor laser power control IC

AN8725FH
ICs for Optical Disk Drive
s Pin Descriptions (continued)
Pin No. Symbol Category
48
AAF MSC A
49
IVOUT OUT A
50
IVIN MSC A
51
IPD MSC A
52
CGND PS A
53
CV_CC
PS
A
54
AGND PS A
55
ERREF IN A
56
VNR
IN A
57 DACMONI OUT A
58
AV_CC
PS
A
59
SGND PS D
60
SGND PS D
61
SGND PS D
62
RGND PS A
63
RDCP1 MSC A
Description
AAF characteristic setting pin for optical monitor circuit.
Connect an external resistor, capacitor between AAF and IVOUT and set
up a cutoff frequency.
I to V conversion signal output pin.
Connect an external variable resistor between IVIN and IVOUT.
I to V conversion resistor connection pin.
Connect an external variable resistor between IVIN and IVOUT.
Pin photo diode (PD) connection pin.
Connect a pin photo diode for detecting a semiconductor laser emitting
light. Connect anode to this pin.
Applicable to a source-type PD which has a typical value of 40 µA to
160 µA output in object lens output power of 1 mW.
GND pin in an optical monitor circuit.
Must be used in the same potential as other GND pins.
Power supply pin in an optical monitor circuit.
Must be used in the same potential as other power supply pins.
GND pin exclusive to a analog circuit.
Must be used in the same potential as other GND pins.
Abnormally emitting light detecting range setting pin.
Sets a full scale voltage of DAC5 and DAC6.
A setting range is VNR or more and input range of an external ADC
or less.
Reference level input pin for PWRMONI output.
Input a reference voltage of 1.25 V of an external ADC.
DAC5, DAC6 monitor pin.
DAC5 voltage is outputted when DAC56 SW register is low, DAC6
voltage is outputted when DAC6 voltage is high.
Power supply pin for an analog circuit, a reference supply voltage circuit, etc.
Must be used in the same potential as other power supply pins.
Pin connected to the chip substrate.
Must be used in the same potential as other GND pins.
GND pin for the lead current setting DAC7 and DAC8.
Must be used in the same potential as other GND pins.
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 RDCP1 and RGND.)
6