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Giải thích chi tiết về linh kiện  DUAL CW P-TYPE LASER DIODE DRIVER
PDF  51 Pages
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nhà sản xuất  ICHAUS [IC-Haus GmbH]
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IC-HTP bảng dữ liệu(HTML) 14 Page - IC-Haus GmbH

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DUAL CW P-TYPE LASER DIODE DRIVER
Rev B1, Page 14/51
ADFNS2
Addr. 0x1A; bit 6
R/W 0
0
ADC measurement PLR2 after level shifting (sense)
1
ADC measurement MDK2 pad (force)
Table 11: ADC channel 2 force/sense selection
ADMDK1
A
RM1
A
Signal Level Converter
255
D
10 Bit
+
-
0
10 Bit
ACC
x1
A
D
R
x2
8 Bit
APC
..10 nF..
LASER CHANNEL 1
8 Bit
D
I LDA1
CI1
P
CI1
CI
ECIE1
DCO
LDA1
OVC
EACC1
CIH1
VBL1
ADFNS1
LDA1
VBL1
VB
VB
VDD
EMC
DISP1
MRH1
MDK1
I LDA1
P
CI1
Figure 5: Channel 1 schematic
Two different control modes can be configured indepen-
dent for each channel: automatic power control (APC)
and automatic current control (ACC). In both modes
a 10 bit logarithmic D/A converter sets the reference
voltage and an 8 bit programmable D/A converter con-
figures the overcurrent threshold.
APC mode
In APC mode the laser power is controlled. The monitor
diode current (Imon) is used as feedback in the laser
power control loop. APC mode is selected by setting
EACCx register bit to 0.
EACC1
Addr. 0x10; bit 0
R/W 0
0
APC mode enabled for channel 1 (light power
regulation)
1
ACC mode enabled for channel 1 (laser current
regulation)
Table 12: Enable APC/ACC channel 1
EACC2
Addr. 0x15; bit 0
R/W 0
0
APC mode enabled for channel 2 (light power
regulation)
1
ACC mode enabled for channel 2 (laser current
regulation)
Table 13: Enable APC/ACC channel 2
An example of APC with default configuration is shown
in figure 6.
APC
8 Bit
A
D
LASER CHANNEL 1
10 Bit
0
Signal Level Converter
255
..10 nF..
x1
A
D
R
x2
8 Bit
CI1
P
+
-
CI1
CI
ECIE1
DCO
LDA1
CIH1
VB
VDD
EMC
DISP1
VBL1
MDK1
MRH1
I LDA1
I LDA1
P
CI1
Figure 6: APC mode simplified
An internal 8 bit programmable logarithmic monitor re-
sistor (PLR) can be used in APC mode. In APC mode
it is also possible to use an external monitor resistor
connected to pin MDKx. If the register bit DISPx is 0,
the PLR is present. If DISPx is 1, the PLR is disabled
and an external monitor resistor must be used.



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