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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 |
| 文件頁數(shù)： | 9/21頁 |
| 文件大小： | 465K |
| 代理商： | SML2108 |
9
2053 2.2 11/07/00
SML2108
PRELIMINARY
SUMMIT MICROELECTRONICS, Inc.
the data is first placed in the volatile register. At the
conclusion of the write command an internal nonvolatile
write sequence initiates the storage of the volatile contents
into the NV register.
Note that when modifying the 10-Bit DAC output, the mean
power control loop will become temporarily disrupted. It
may be several milliseconds before the bias current has
settled to its steady state value. Until then its value will be
undefined.
Modulation Current
—
Auto-Monitor Control
The laser bias current, which relates directly to laser
temperature, can be monitored using an on-board, cur-
rent-sensing A/D converter. In the auto-monitor mode the
8-Bit output of the converter is used as an address to the
EEPROM lookup table. The subsequent 8-Bit data output
from the lookup table becomes the input for the compen-
sation DAC. The 8-Bit compensation DAC output is a
current in the range of 0 to 100mA and is used to control
the modulation current MODP and MODN. The output
block of the modulation current control is shown in Figure
3.
The lookup table provides an arbitrary mapping from bias
current to modulation current. The input range to the ADC
may be scaled and/or offset to provide maximum resolu-
tion within the appropriate conversion space. The sample
interval is programmable from 10μs to 1s. Refer to the
ADC section for further details about configuring the A/D.
The interface is used to program the configuration regis-
ters as well as lookup table values.
Lookup Table
A 2k-Bit (256 x 8) memory array of on-board EEPROM
comprises the internal lookup table. This array is ac-
cessed via the 2-wire serial interface using a slave ad-
dress of 1010
BIN
. (Note: 1010
BIN
is the default, however
this may be set to 1110
BIN
, depending upon the contents
of Configuration Register 2.) Refer to the Bus Interface
section for details on programming and reading data from
the device.
In the auto-monitor mode the content of the array repre-
sents the transfer function between the A/D output and the
final value of modulation current. Using a lookup table to
implement this function allows arbitrary functions, and
even nonlinear relations, to be easily realized. Also, the
use of a lookup table allows each device to be customized
to normalize overall module operation.
Although the memory may normally be read and written as
a standard memory, a security feature exists in the con-
figuration settings that will prevent any external access to
the array. Additionally, if the auto-monitor feature is not
used, then the modulation output current may be pro-
grammed to a fixed value, and the array may be used as
a standard memory to store device settings, board identi-
fication values, production dates, etc.
8-Bit Current Output D/A
The 8-Bit D/A defines the modulation output current.
Associated with this DAC are an 8-Bit volatile register and
an 8-Bit nonvolatile (NV) register. The content of the
volatile register determines the DAC output current. The
DAC output current is given by the following relation:
X
OC
100mA
256
=
×
where X = the 8-Bit data stored in the volatile register. On
device power-up the volatile register may be loaded with
all zeroes or it may be loaded from the contents of the 8-
Bit nonvolatile register.
Access to the 8-Bit volatile register is obtained via the 2-
wire interface at slave address 1001
BIN
, word address 4.
Refer to Figures 8 and 11 for details on programming and
reading data from the 8-Bit register. When writing to the
volatile register, the new DAC output will become valid
immediately at the end of the write command. 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 8-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
the volatile register, except word address 6 is used instead
of 4. 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,
the data is first placed in the volatile register. At the
conclusion of the write command, an internal nonvolatile
write sequence initiates the storage of the volatile contents
into the NV register.
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