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參數(shù)資料
| 型號： | MAX1231 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | ADC |
| 英文描述： | 12-Bit 300ksps ADCs with FIFO. Temp Sensor. Internal Reference |
| 中文描述： | 12位、300ksps ADC，帶有FIFO、溫度傳感器及內(nèi)置基準 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 512K |
| 代理商： | MAX1231 |
M
12-Bit 300ksps ADCs with FIFO,
Temp Sensor, Internal Reference
______________________________________________________________________________________
15
Temperature Measurements
The MAX1227/MAX1229/MAX1231 perform tempera-
ture measurements with an internal diode-connected
transistor. The diode bias current changes from 68μA
to 4μA to produce a temperature-dependent bias volt-
age difference. The second conversion result at 4μA is
subtracted from the first at 68μA to calculate a digital
value that is proportional to absolute temperature. The
output data appearing at DOUT is the above digital
code minus an offset to adjust from Kelvin to Celsius.
The reference voltage used for the temperature mea-
surements is derived from the internal reference source
to ensure that 1 LSB corresponds to 1/8 of a degree.
Output Data Format
Figures 4
–
7 illustrate the conversion timing for the
MAX1227/MAX1229/MAX1231. The 12-bit conversion
result is output in MSB-first format with four leading
zeros. DIN data is latched into the serial interface on
the rising edge of SCLK. Data on DOUT transitions on
the falling edge of SCLK. Conversions in clock modes 00
and 01 are initiated by
CNVST
. Conversions in clock
modes 10 and 11 are initiated by writing an input data
byte to the conversion register. Data is binary for unipo-
lar mode and two
’
s complement for bipolar mode.
BIT NAME
UCH0/1
UCH2/3
UCH4/5
UCH6/7
UCH8/9
UCH10/11
UCH12/13
UCH14/15
BIT
FUNCTION
7 (MSB)
6
5
4
3
2
1
0 (LSB)
Set to 1 to configure AIN0 and AIN1 for unipolar differential conversion.
Set to 1 to configure AIN2 and AIN3 for unipolar differential conversion.
Set to 1 to configure AIN4 and AIN5 for unipolar differential conversion.
Set to 1 to configure AIN6 and AIN7 for unipolar differential conversion.
Set to 1 to configure AIN8 and AIN9 for unipolar differential conversion (MAX1229/MAX1231 only).
Set to 1 to configure AIN10 and AIN11 for unipolar differential conversion (MAX1229/MAX1231 only).
Set to 1 to configure AIN12 and AIN13 for unipolar differential conversion (MAX1231 only).
Set to 1 to configure AIN14 and AIN15 for unipolar differential conversion (MAX1231 only).
Table 4. Unipolar Mode Register (Addressed Through Setup Register)
BIT NAME
BCH0/1
BCH2/3
BCH4/5
BCH6/7
BCH8/9
BCH10/11
BCH12/13
BCH14/15
BIT
FUNCTION
7 (MSB)
6
5
4
3
2
1
0 (LSB)
Set to 1 to configure AIN0 and AIN1 for bipolar differential conversion.
Set to 1 to configure AIN2 and AIN3 for bipolar differential conversion.
Set to 1 to configure AIN4 and AIN5 for bipolar differential conversion.
Set to 1 to configure AIN6 and AIN7 for bipolar differential conversion.
Set to 1 to configure AIN8 and AIN9 for bipolar differential conversion (MAX1229/MAX1231 only).
Set to 1 to configure AIN10 and AIN11 for bipolar differential conversion (MAX1229/MAX1231 only).
Set to 1 to configure AIN12 and AIN13 for bipolar differential conversion (MAX1231 only).
Set to 1 to configure AIN14 and AIN15 for bipolar differential conversion (MAX1231only).
Table 5. Bipolar Mode Register (Addressed Through Setup Register)
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| MAX1231ACEG+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 16Ch 300ksps 3.6V 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1231ACEG+T | 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1231ACEG-T | 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1231AEEG | 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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