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PDF AN8725FH Data sheet ( Hoja de datos )
| Número de pieza | AN8725FH | |
| Descripción | Semiconductor laser power control IC | |
| Fabricantes | Panasonic Semiconductor | |
| Logotipo |  |
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ICs for Optical Disk Drive
AN8725FH
Semiconductor laser power control IC
s Overview
The AN8725FH is a laser driver IC that can set a laser
emitting level to a maximum precision in recording and
playback of an optical recording equipment such as PD,
and can modulate a laser light in tune with the external
signal.
s Features
• Digital setting of playback current, peak current, bias
current and abnormal light emitting level
• Peak current and bias current can be modulated by the
external signal.
• Driving current set-up (digital set-up)
For playback: 8-bit + 4-bit (0 mA to 80 mA)
5-bit + 4-bit (0 mA to 150 mA)
For peak: 4-bit + 8-bit (0 mA to 150 mA)
For bias: 4-bit + 8-bit (0 mA to 150 mA)
• Laser output light monitoring circuit built-in
• Abnormal light emitting detecting function built-in:
Possible to set up excessive and insufficient light emit-
ting levels with 4-bit DAC for playback and recording,
respectively.
• Supply voltage abnormality detection:
Voltage down (3.9 V or less), voltage up (6.1 V or more)
s Applications
• Optical disk drive
60
61
14.00±0.20
12.00±0.20
41
40
Unit: mm
80
1
(1.25)
0.50
21
20
0.18
+0.10
–0.05
(1.00)
Seating plane
0.50±0.20
0° to 10°
QFP080-P-1212
1
1 page  
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 DVCC 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 AVCC 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.
5
5 Page 
ICs for Optical Disk Drive
AN8725FH
s Electrical Characteristics at VCC = 5.0 V, Ta = 25°C (continued)
Parameter
Symbol
Conditions
Min Typ Max Unit
DAC8 block (continued)
Maximum output current
I8max Set to DAC8 = "Fh",
70 80 90 mA
DAC1 [FFh], DAC9 [1Fh], DAC7 [0h]
Minimum output current
I8min Set to DAC8 = "0h",
4 5 6 mA
DAC1 [FFh], DAC9 [1Fh], DAC7 [0h]
Settling time
tSDA8
XWR ↑ to DAC8 [0h to Fh],
DAC1 [80h], ±0.5 LSB,
DAC9 [00h], DAC7 [0h]
50 250 ns
DAC2 block
Resolution
RES2
8 bit
Integral linearity error
EL2
−1.0 5.0 LSB
Differential linearity error
ED2
−1.0 1.0 LSB
Maximum output current
Offset current
Settling time
I2max
I2OF
tSDA2
DAC2 = "FFh", DAC4 [Fh]
DAC2 = "00h", DAC4 [Fh]
XWR ↑ to DAC2 [10h to FFh],
±2.0 LSB, DAC4 [Fh]
133
− 0.1
150
100
170
0.1
250
mA
mA
ns
DAC3 block
Resolution
RES3
8 bit
Integral linearity error
EL3
−1.0 5.0 LSB
Differential linearity error
ED3
−1.0 1.0 LSB
Maximum output current
Offset current
Settling time
I3max
I3OF
tSDA3
DAC3 = "FFh", DAC4 [Fh]
DAC3 = "00h", DAC4 [Fh]
XWR ↑ to DAC3 [10h to FFh],
±2.0 LSB, DAC4 [Fh]
133
− 0.1
150
200
170
0.1
450
mA
mA
ns
DAC4 block
Resolution
RES4
4 bit
Integral linearity error
EL4
−1.0 1.0 LSB
Differential linearity error
ED4
−1.0 1.0 LSB
Maximum output current
Offset current
Settling time
I4max
I4OF
tSDA4
DAC2 = "FFh", DAC4 [Fh]
DAC2 = "00h", DAC4 [Fh]
XWR ↑ to DAC4 [0h to Fh],
±0.5 LSB, DAC2 [FFh]
133
− 0.1
150
300
170
0.1
600
mA
mA
ns
DAC9 block
Resolution
RES9
5 bit
Integral linearity error
EL9
−1.0 1.0 LSB
Differential linearity error
ED9
−1.0 1.0 LSB
Maximum output current
I9max DAC9 = "1Fh", DAC7 [Fh],
DAC1 [00h], DAC8 [0h]
133 150 170 mA
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AN8725FH.PDF ] | |
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