參數(shù)資料
型號(hào)： SML2108
廠商： Summit Microelectronics, Inc.
英文描述： Laser Diode Adaptive Power Controller
中文描述： 激光二極管自適應(yīng)功率控制器
文件頁(yè)數(shù)： 8/21頁(yè)
文件大?。?/td> 465K
代理商： SML2108
8
SML2108
PRELIMINARY
2053 2.2 11/07/00
SUMMIT MICROELECTRONICS, Inc.
Figure 2. Output Block 1: Mean Power Control
Figure 3. Output Block 2: I
MOD
The built-in integration time constant is nominally 1ms.
This is accomplished by using an internal 2M
resistor
and 500pF capacitor. The time constant can be modified
by adding external capacitance between the CAP1 and
CAP2 terminals, and/or by adding external resistance
between the DETECT and CAP1 terminals. For stability
reasons it is not recommended that the time constant be
decreased to less than 100us.
The output of an internal 10-Bit DAC biases the positive
terminal of the integrating amplifier. This DAC provides an
analog reference to the integrator which is useful for initial
calibration of the laser module. The full-scale value of the
DAC output is 1.5V.
10-Bit Bias Control D/A
The 10-Bit D/A determines the reference voltage of the
non-inverting terminal of the integrating amplifier in the
mean power control loop. Associated with this DAC are a
10-Bit volatile register and a 10-Bit nonvolatile (NV) regis-
ter. The content of the volatile register determines the
DAC output voltage. The DAC output voltage is given by
the following relation:
X
OV
1.5V
1024
=
×
where X = the decimal equivalent of the 10-Bit data stored
in the volatile register. Note that the DAC output voltage
is not directly accessible external to the chip. However,
when the SML2108 is placed in a typical application circuit,
the mean power control feedback loop forces the voltage
at the DETECT pin to be the same as the DAC output. On
device power-up the volatile register may be loaded with
all zeroes, or it may be loaded from the contents of the 10-
Bit nonvolatile register.
Access to the 10-Bit volatile register is obtained via the 2-
wire interface at slave address 1001
BIN
, word address 0.
Refer to Figures 9, 10, 12, and 13 for details on program-
ming and reading data from the 10-Bit register. When
writing to the volatile register the new DAC output will
become valid immediately at the end of the write com-
mand. Reading the volatile register has no effect on the
DAC output. Reading or writing the volatile register has no
effect on the contents of the nonvolatile register.
The 10-Bit NV register can only be accessed indirectly
through the volatile register. The command sequence to
communicate with the NV register is the same as that of
VDD
BIAS
CONTROL
ADC
Input
BIASP
BIASN
I
BIAS
Sink
0 to 100 mA
I
BIAS
Source
0 to 10 mA or
0 to 100 mA
From MPC
Integrator
2053 Fig02
VDD
MOD
CONTROL
MODP
MODN
I
MOD
Sink
0 to 100 mA
I
MOD
Source
0 to 10 mA or
0 to 100 mA
From I
MOD
DAC
2053 Fig03
the volatile register, except word address 2 is used instead
of 0. When reading the NV register, the data is first
transferred into the volatile register where it may be
accessed by the serial interface. Note that upon this
transfer the DAC output will change immediately to reflect
the new data. Similarly, when writing to the NV register,
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