參數(shù)資料
型號(hào)： MIC3001GML TR
廠商： Micrel Inc
文件頁(yè)數(shù)： 16/76頁(yè)
文件大小： 0K
描述： IC FOM MANAGEMENT W/CALIBR 24MLF
標(biāo)準(zhǔn)包裝： 1,000
類型： 收發(fā)器
規(guī)程： SDHj Sonet
電源電壓： 3 V ~ 3.6 V
安裝類型： 表面貼裝
封裝/外殼： 24-VFQFN 裸露焊盤，24-MLF?
供應(yīng)商設(shè)備封裝： 24-MLF?（4x4）
包裝： 帶卷 (TR)
其它名稱： MIC3001GMLTR
MIC3001GMLTR-ND
Micrel, Inc.
MIC3001
August 2004
23
M9999-082404-A
hbwhelp@micrel.com or (408) 955-1690
Laser Modulation Control
As shown in Figure 4, a temperature-compensated DAC
is provided to set and control the laser modulation current
via
an
external
laser
driver
circuit.
MODREF
in
OEMCFG0 selects whether the VMOD DAC output swings
up from ground or down from VDD. If the laser driver
requires a voltage input to set the modulation current, the
MIC3001’s VMOD output can drive it directly. If a current
input is required, a fixed resistor can be used between the
driver
and
the
VMOD
output.
Several
different
configurations are possible as shown in Figure 7.
When APC is on, i.e., the APCCAL bit in OEMCAL0 is set
to 0, the value corresponding to the current temperature is
taken from the MODLUT look-up table, added to
MODSET, and loaded into the VMOD DAC. When APC is
off, the value in VMOD is loaded directly into the VMOD
DAC, bypassing the look-up table entirely. This provides
for direct modulation control for setup and calibration. The
MODREF bit determines the DACs response to higher or
lower numeric values.
Figure 6. Transmitter Configurations
Supported by MIC3001
Figure 7. VMOD Configured as Voltage Output
with Gain
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