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| 型号： | MAX1329BETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 32/78页 |
| 文件大小： | 0K |
| 描述： | IC DAS 12BIT 300KSPS 40-TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | * |
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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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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX132C/D | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX132CNG | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX132CNG+ | 功能描述:模数转换器 - ADC 18-Bit .1ksps .545V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX132CWG | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX132CWG+ | 功能描述:模数转换器 - ADC 18-Bit .1ksps .545V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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