參數(shù)資料
型號： MAX1329BETL+T
廠商： Maxim Integrated Products
文件頁數(shù)： 62/78頁
文件大小： 0K
描述： IC DAS 12BIT 300KSPS 40-TQFN-EP
產品培訓模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝： 2,500
系列： *
MAX1329/MAX1330
12-/16-Bit DASs with ADC, DACs, DPIOs, APIOs,
Reference, Voltage Monitors, and Temp Sensor
______________________________________________________________________________________
65
Optical Reflectometry Application with
Dual LED and Single Photodiode
Figure 28 illustrates the MAX1329 in an optical reflectom-
etry application with two transmitting LEDs and one
receiving photodiode. The LEDs transmit light at specific
frequencies onto the sample strip and the photodiode
receives the reflections from the strip. Set the DACA out-
put to provide the appropriate bias currents for the LEDs.
The DSWA and DSWB switches are open in this configu-
ration. The LED bias current is calculated as ILED =
VOUTA/RB. REFADC is used as an analog ground and
DACB is set to ensure that the photodiode is not forward
biased. The IF current is converted to a voltage through
the RF resistor and measured by the internal ADC.
SPDT1 and SPDT2 are configured as single-pole
double-throw switches and enable switching between
VBAT
PHOTO
DIODE
RF
IF
Q1
DACA
OUTA
FBA
DACB
OUTB
FBB
SNO1
SNC1
SCM1
REFADC
REFDAC
REFADJ
2.5V
REF
AV = 0.5, 0.82, 1
REFDAC
SNC2
SNO2
SCM2
VBAT
RB
Q2
LED
1.25V
2.50V
AV = 0.5, 0.82, 1
DSWA
DSWB
SPDT1
SPDT2
1
μF
0.01
μF
1
μF
MAX1329
Figure 28. Optical Reflectometry Application with Dual LED and Single Photodiode
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MAX132CWG+ 功能描述:模數(shù)轉換器 - ADC 18-Bit .1ksps .545V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
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