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參數(shù)資料
| 型號： | MAX1272 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | ADC |
| 英文描述： | Fault-Protected. 12-Bit ADCs with Software-Selectable Input Range |
| 中文描述： | 帶故障保護(hù)的12位ADC，具有軟件可選的輸入范圍 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 850K |
| 代理商： | MAX1272 |
M
Starting a Conversion
The MAX1272/MAX1273 use the serial clock to complete
an acquisition. The falling edge of
CS
does not start a
conversion on the MAX1272/MAX1273. Each conversion
requires a control byte. Programming the fourth bit in the
control byte starts the acquisition sequence. Conversion
starts on the falling edge of the eighth clock cycle after
the start bit.
Keep
CS
low during successive conversions. If a start bit
is received after
CS
transitions from high to low, but before
the output bit 4 (D4) becomes available, the current con-
version terminates and a new conversion begins. DOUT
enters high-impedance state when
CS
transitions high.
SCLK
shifts data in and out of the MAX1272/MAX1273
and controls both acquisition and conversion timing.
Conversion begins immediately after the end of the
acquisition cycle. Successive-approximation bit deci-
sions appear at DOUT on each of the following 12 clock
falling edges (Figure 5). Additional clock falling edges
result in trailing zeros at DOUT.
The maximum running rate of the MAX1272/MAX1273 is
16 clocks per conversion. A clock speed of 1.4MHz
allows for a maximum sampling rate of 87ksps (Figure 6).
To achieve the maximum throughput, keep
CS
low, and
start the control byte after bit 4 (D4) of the conversion in
progress clocks out on DOUT.
If
CS
is low and SCLK is continuous, guarantee a start
bit by first clocking in 16 zeros.
Applications Information
Power-On Reset
The MAX1272/MAX1273 power-up in normal operating
mode (all internal circuitry active), and external reference
mode. The MAX1272/MAX1273 require a start bit to initi-
ate a conversion. The contents of the output data register
clear during power-up.
Internal or External Reference
Operate the MAX1272/MAX1273 with an internal or an
external reference. Configure REF as an internal refer-
ence output or an external reference input using the
serial interface. When changing from external reference
mode to internal reference mode, allow 2ms (C
REF
=
1μF) for the reference to stabilize before taking any
measurement.
Internal Reference
The internally trimmed reference provides 4.096V at REF.
Bypass REF to GND with a 1.0μF capacitor (Figure 7a).
Fault-Protected, 12-Bit ADCs
with Software-Selectable Input Range
12
______________________________________________________________________________________
1
8
1
2
3
CS
DIN
DOUT
SCLK
ACQUISITION
4 SCLKs
ACQUISITION
4 SCLKs
HI-Z
S
R
B
M
P
M
R
R
S
R
B
M
P
M
R
R
D
D
D
D
D
D
D
D
D
D
D
D
MSB
LSB
D
D
D
D
D
D
D
D
D
D
D
D
MSB
LSB
S
R
B
M
P
CONVERSION
12 SCLKs
CONVERSION
12 SCLKs
CONTROL BYTE 0
CONTROL BYTE 1
CONTROL BYTE 2
RESULT 0
RESULT 1
Figure 6. Conversion Timing, 16 Clocks/Conversion
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| MAX1273 | Fault-Protected. 12-Bit ADCs with Software-Selectable Input Range |
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| MAX1273EUA | Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range |
| MAX1272EPA | Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range |
| MAX1273CPA | Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1272BCPA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1272CPA | 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 |
| MAX1272CPA+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 487ksps 4.18V 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 |
| MAX1272CUA | 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 |
| MAX1272CUA+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC FAULT-PROTECTED 12-BIT 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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