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IC-HT 数据表(PDF) 15 Page - IC-Haus GmbH |
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IC-HT 数据表(HTML) 15 Page - IC-Haus GmbH |
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15 / 45 page  prel imin ary prel imin ary iC-HT DUAL CW LASER DIODE DRIVER Rev B1, Page 15/45 0 255 R 8 Bit LASER CHANNEL 1 10 Bit A D 8 Bit A D 10 Bit A D ACC APC RACC RM1 PLR ..10 nF.. N I LDK CI1 MRL1 MDA1 AGND1 CIL1 CI1 LDK1 DCO ECIE1 VB VDD LDK1 ADSNF1 OVC DISP1 EMC EACC1 + - N I LDK CI1 Figure 6: Channel 1 schematic Two different control modes can be configured inde- pendent for each channel: automatic power control (APC) and automatic current control (ACC). In both modes a 10 bit logarithmic D/A converter sets the refer- ence voltage and an 8 bit programmable D/A converter configures the overcurrent threshold. APC (Automatic Power Control) mode In APC mode the laser power is controlled. The moni- tor diode current 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 1 ACC mode enabled for channel 1 Table 12: APC/ACC in channel 1 EACC2 Addr. 0x15; bit 0 R/W 0 0 APC mode enabled for channel 2 1 ACC mode enabled for channel 2 Table 13: APC/ACC in channel 2 An example of APC with default configuration is shown in figure 7. 0 255 R 8 Bit 8 Bit 10 Bit LASER CHANNEL 1 A ..10 nF.. A D D PLR CI1 + - I LDK N LDK1 CIL1 AGND1 MRL1 CI1 CI ECIE1 DCO MDA1 EMC I LDK N CI1 Figure 7: 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 MDAx. If 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. DISP1 Addr. 0x10; bit 2 R/W 0 0 PLR enabled for channel 1 1 PLR disabled for channel 1 Table 14: Disable PLR channel 1 DISP2 Addr. 0x15; bit 2 R/W 0 0 PLR enabled for channel 2 1 PLR disabled for channel 2 Table 15: Disable PLR channel 2 Both programmable logarithmic monitor resistors (PLR) feature a wide logarithmic resistor range from 100 Ω to 500 kΩ, in steps of typically 3.3%. This cov- ers a wide range of monitor currents. More information about the PLR can be found on page 25. For fine-tuning the optical power, the reference volt- age can be set with a 10 bit logarithmic D/A converter, which is configurable through the register REFx. This converter has a voltage range that goes typically from 0.1 V to 1.1 V, allowing an operation resolution of typi- cally 0.235%. More information on the logarithmic D/A converter can be found on page 26. For calculating the minimum value of Imon, Vref(0x00, max value) (cf. Electrical Characteristics No. 303) and Rmda(RMDx = 0xFF, min value) (cf. Electrical Charac- teristics No. 201) are used. |
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