AN8725FH Datasheet, PDF (5/36 Pages) Panasonic Semiconductor – Semiconductor laser power control IC

ICs for Optical Disk Drive
AN8725FH
s Pin Descriptions (continued)
Pin No. Symbol Category
31
ERFIL MSC D
32
XHFON OUT D
33
DGND PS D
34
DV_CC
PS
D
35
AGND PS A
36
VC
MSC A
37
RREF MSC A
38
LPF11 MSC A
39
LPF12 MSC A
40
IGND PS A
41
SGND PS D
42
SGND PS D
43
LPF91 MSC A
44
LPF92 MSC A
45
AV_CC
PS
A
46 DETMONI OUT A
47 PWRMONI OUT A
Description
Filter setting pin to avoid a detection error of laser abnormality caused
by noise.
Connect an external capacitor between ERFIL and DGND, and set a filter
together with a resistor (10 kΩ) inside the IC. This pin is for schmitt-trigger
input.
HF module on/off control signal output pin.
High corresponds to off and low to on.
GND pin exclusive to a logic circuit.
Must be used in the same potential as other GND pins.
Power supply pin exclusive to a logic 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.
Output pin for reference voltage (1.25 V).
Connects a capacitor C between this pin and AGND for de-coupling.
Reference resistor connecting pin to determine an output current for each DAC.
Connect a resistor of 10 kΩ between RREF and AGND.
LPF characteristic setting pin for DAC1 and DAC8.
Connect an external resistor between LPF11 and LPF12, and then
capacitor between LPF12 and IGND to set up a cutoff frequency.
GND pin for playback power supply setting DAC1, DAC9 and distur-
bance reduction LPF.
Must be used in the same potential as other GND pins.
Pin connected to the chip substrate.
Must be used in the same potential as other GND pins.
LPF characteristic setting pin for DAC9 and DAC7.
Connect an external resistor between LPF91 and LPF92 and then
capacitor between LPF92 and IGND to set a cutoff frequency.
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 to monitor a signal for detecting abnormally emitted light.
In a playback mode, the signal output is five times that in recording
(ten times is posisible by a register setting). Has offset to VNR due to
being outputted through a buffer of transistors.
Laser emitting light monitor signal.
In a low-level of RPHOLD, the amplifier output has 10 times gain
compared with recording, and is equipped with AFF.
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