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SML2108F Datasheet(PDF) 10 Page - Summit Microelectronics, Inc.

Part # SML2108F
Description  Laser Diode Adaptive Power Controller
PDF  21 Pages
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Manufacturer  SUMMIT [Summit Microelectronics, Inc.]
Direct Link  http://www.summitmicro.com
Logo SUMMIT - Summit Microelectronics, Inc.

SML2108F Datasheet(HTML) 10 Page - Summit Microelectronics, Inc.

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10
SML2108
2053 2.2 11/07/00
SUMMIT MICROELECTRONICS, Inc.
PRELIMINARY
Figure 5. Half Scale (code 10
BIN) with Offset
Figure 4. Full Scale (code 11
BIN) with Offset
Figure 6. Quarter Scale (code 01
BIN) with Offset
Figure 7. Tenth Scale (code 00
BIN) with Offset
ADC SCALING AND OFFSET
The ADC can be customized to monitor a particular range
of bias current by programming Register 0. Bits 3 and 2
control the scaling of the ADC while bits 1 and 0 control the
ADC offset. The four graphs (Figures 4, 5, 6, & 7) illustrate
the ADC scale values, according to the two bit code. In
each Graph the curves are differentiated by the ADC offset
values. Note: if using IBIASP with the maximum current
option set to 10 mA, divide the x-axis value by 10 (
i.e., 75
= 7.5,
etc.).
These combinations of scales and offsets allow the reso-
lution to be maximized over a given range of current. For
example, if the bias current is known to be in the range of
30mA to 70mA the choice would be the Half scale graph
(code 10BIN) and the ¼ offset curve (code 01BIN) to
maximize the resolution of the ADC.
Note that these graphs assume a full scale bias current of
100mA. When the ADC is configured to receive input from
the EXT TEMP pin full scale current becomes 390.6µA,
which limits the internal 1/256 scale factor between bias
current and the ADC input current.
2053 Fig04
255
224
192
160
128
96
64
32
0
IBIAS (mA)
0
50
10
20
30
40
100
60
70
80
90
00
01
10
11
Offset
2053 Fig05
255
224
192
160
128
96
64
32
0
IBIAS (mA)
0
50
10
20
30
40
100
60
70
80
90
00
01
10
11
Offset
2053 Fig06
255
224
192
160
128
96
64
32
0
IBIAS (mA)
0
50
10
20
30
40
100
60
70
80
90
00
01
10
11
Offset
2053 Fig07
255
224
192
160
128
96
64
32
0
IBIAS (mA)
0
50
10
20
30
40
100
60
70
80
90
00
01
10
11
Offset



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