參數(shù)資料
型號： SML2108F
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)： 19/21頁
文件大小： 465K
代理商： SML2108F
19
2053 2.2 11/07/00
SML2108
PRELIMINARY
SUMMIT MICROELECTRONICS, Inc.
APPLICATION EXAMPLE USING EXTERNAL TEM-
PERATURE INPUT
The EXT TEMP pin of the SML2108 allows the input of the
internal ADC to be driven from an external device, rather
than a mirrored version of the bias current. Figure 25
shows an example using a National Semiconductor
LM334 to deliver a current into the SML2108 that is
proportional to absolute temperature. The scale and
offset features of the ADC input can be used to center this
current and maximize the full range of the look-up table.
For this application the current I
SET
coming out of the
LM334 and into the EXT TEMP pin of the SML2108 is
given by the following equation:
I
SET
= 227μV /
o
K / R
SET
For example, using a value of 210
for R
SET
yields a
current of 295μA at 0
o
C and 387μA at 85
o
C.
Next select scale and offset values of the ADC input that
will optimize the current range of the LM334. Nominal full-
scale input current of the ADC is 390.6μA (= 100mA/256).
By setting the input offset to
scale (293μA) and the full-
scale range to
scale (97.6μA), then the zero scale of the
internal ADC becomes 293μA, and the full-scale is
390.6μA. This represents a temperature range of approxi-
mately
–
2
o
C to 88
o
C using a 210
resistor in the configu-
ration shown. (These settings correspond to configuration
Register 0, Bits 3 - 0 set to 7
HEX
.)
Figure 25. Example of an External Temperature
Sensing Device
APPLICATIONS
+
–
2053 Fig25
5V
R
SET
EXT TEMP
SML2108
LM334
210
±1%
I
SET
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SML-210DT 制造商:ROHM 功能描述:ORANGE SM LED 0805 TRANS CLEAR 2.0X1.25mm 610nm 制造商:ROHM 功能描述:ORANGE SM LED 0805 TRANS CLEAR 2.0X1.25mm 610nm - free partial T/R at 500.
SML-210DTT86 功能描述:標準LED-SMD ORANGE SMD TRANS LENS RoHS:否 制造商:Vishay Semiconductors 封裝 / 箱體:0402 LED 大小:1 mm x 0.5 mm x 0.35 mm 照明顏色:Red 波長/色溫:631 nm 透鏡顏色/類型:Water Clear 正向電流:30 mA 正向電壓:2 V 光強度:54 mcd 顯示角:130 deg 系列:VLMx1500 封裝:Reel
SML-210DTT86M 制造商:ROHM Semiconductor 功能描述:LED SMD 0805 ORANGE 制造商:ROHM Semiconductor 功能描述:LED, SMD, 0805, ORANGE 制造商:ROHM Semiconductor 功能描述:LED, ORANGE, 1.2MM X 1.25MM, 6.3MCD, 608NM; Bulb Size:1.2mm x 1.25mm; LED Color:Orange; Luminous Intensity:6.3mcd; Forward Current If:20mA; Forward Voltage:2V; LED Mounting:SMD; Lens Shape:Rectangular; Wavelength Typ:608nm ;RoHS Compliant: Yes
SML-210FT 制造商:ROHM 制造商全稱:Rohm 功能描述:Small, chip LEDs
SML-210FTT86 功能描述:標準LED-SMD LIGHT GREEN SMD TRANS LENS RoHS:否 制造商:Vishay Semiconductors 封裝 / 箱體:0402 LED 大小:1 mm x 0.5 mm x 0.35 mm 照明顏色:Red 波長/色溫:631 nm 透鏡顏色/類型:Water Clear 正向電流:30 mA 正向電壓:2 V 光強度:54 mcd 顯示角:130 deg 系列:VLMx1500 封裝:Reel
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