參數(shù)資料
型號： MAX1329BETL+
廠商： Maxim Integrated Products
文件頁數(shù)： 32/78頁
文件大?。?/td> 0K
描述： IC DAS 12BIT 300KSPS 40-TQFN-EP
產(chǎn)品培訓模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝： 50
系列： *
MAX1329/MAX1330
12-/16-Bit DASs with ADC, DACs, DPIOs, APIOs,
Reference, Voltage Monitors, and Temp Sensor
38
______________________________________________________________________________________
See Figure 21 for performing an ADC conversion using
a DPIO input programmed as CONVST. Allow at least
600ns for acquisition while the DPIO input is low and
the acquisition ends on the rising edge of the DPIO.
The conversion requires an additional 14 ADC clock
cycles. If the PGA gain is set to 4 or 8, the minimum
acquisition time is 1.2s due to the increase of the input
sampling capacitor.
Temperature Measurement
The MAX1329/MAX1330 perform temperature measure-
ment by measuring the voltage across a diode-con-
nected transistor at two different current levels. The
following equation illustrates the algorithm used for tem-
perature calculations:
where:
VHIGH = sensor-diode voltage with high current flowing
(IHIGH)
VLOW = sensor-diode voltage with low current flowing
(ILOW)
q = charge of electron = 1.602 10-19 coulombs
k = Boltzman constant = 1.38 10-23 J/K
n = ideality factor (slightly greater than 1)
The temperature measurement process is fully automat-
ed in the MAX1329/MAX1330. All steps are sequenced
and executed by the MAX1329/MAX1330 each time an
input channel (or an input channel pair) configured for
temperature measurement is scanned.
The resulting 12-bit, two’s complement number repre-
sents the sensor temperature in degrees Celsius, with
1 LSB = +0.125°C. Figure 22 shows the timing for a
temperature measurement.
An external 2.500V reference can be applied to
REFADJ, provided the internal reference is disabled
first. Use the temperature correction equation to obtain
the correct temperature:
TACT = 0.997 x TMEAS - 0.91°C
Use the following equation when using the internal ref-
erence:
TT
T
V
ACT
MEAS
=+
+
×
(.
) (
.
270 63
1
2 500
R
REFADJ
C
)°
temperature
V
x
HIGH
LOW
=
()
-
q
k
nx ln
I
High
LOW
TEMP CONVERT COMMAND
(SCLK, DIN, DOUT NOT SHOWN)
THERE ARE TWO ADC CONVERSIONS PER TEMPERATURE CONVERSION.
1 CLOCK = 1/(ADC MASTER CLOCK FREQUENCY)
ADC MODE
TRACK
CONVERT
TRACK
CONVERT
START
CS
STOP
WAIT PERIOD
93.5 CLOCKS
1ST AQUISITION
90 CLOCKS
2ND AQUISITION
87 CLOCKS
2ND CONVERSION
17.5 CLOCKS
1ST CONVERSION
19 CLOCKS
Figure 22. Temperature-Conversion Timing
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參數(shù)描述
MAX1329BETL+ 功能描述:ADC / DAC多通道 12-Bit 2Ch 300ksps 5.4V Precision ADC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-40
MAX1329BETL+T 功能描述:ADC / DAC多通道 12-Bit 2Ch 300ksps 5.4V Precision ADC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-40
MAX132C/D 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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
MAX132CNG 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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
MAX132CNG+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18-Bit .1ksps .545V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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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