參數(shù)資料
型號(hào)： MAX1273EPA
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： 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP8
封裝： 0.300 INCH, PLASTIC, MO-058, DIP-8
文件頁(yè)數(shù)： 8/20頁(yè)
文件大小： 850K
代理商： MAX1273EPA
M
Detailed Description
Converter Operation
The MAX1272/MAX1273 multirange ADCs use succes-
sive approximation and internal track/hold (T/H) circuitry
to convert an analog signal to a 12-bit digital output.
Figure 2 shows a block diagram of the MAX1272/
MAX1273.
Analog-Input Track/Hold
The T/H tracking/acquisition mode begins on the falling
edge of the fourth clock cycle in the 8-bit input control
word and enters hold/conversion mode on the falling
edge of the eighth clock cycle.
The MAX1272/MAX1273 input architecture includes a
resistor-divider and a T/H system (Figure 3). When
operating in bipolar or unipolar mode, the resistor-
divider network formed by R1, R2, and R3 scales the
signal applied at the input channel. Use a low source
impedance (<4
) to minimize gain error.
Input Bandwidth
The ADC
’
s small-signal input bandwidth depends on
the selected input range and varies from 1.25MHz to
5MHz (see the
Electrical Characteristics
). The maxi-
mum sampling rate for the MAX1272/MAX1273 is
87ksps (16 clocks per conversion). Use undersampling
techniques to digitize high-speed transient events and
measure periodic signals with bandwidths exceeding
the ADC
’
s sampling rate.
Use anti-alias filtering to avoid the aliasing of high-fre-
quency signals into the frequency band of interest. An
anti-aliasing filter must limit the input bandwidth to no
more than one half of the sampling frequency.
Fault-Protected, 12-Bit ADCs
with Software-Selectable Input Range
8
_______________________________________________________________________________________
Pin Description
PIN
1
2
3
4
5
NAME
SCLK
DIN
V
DD
GND
AIN
FUNCTION
Serial Clock Input. Clocks data in and out of serial interface. SCLK sets the conversion speed.
Serial Data Input. Data clocks in on the rising edge of SCLK.
5V Supply. Bypass with a 0.1μF capacitor to GND.
Ground
Analog Input
6
REF
Reference Buffer Output/Reference Input. Bypass REF with a 1μF capacitor to GND. In internal
reference mode, the reference buffer provides a 4.096V nominal output. For external reference mode,
disable the internal reference buffer through the serial interface and apply an external reference to REF.
7
CS
Active-Low Chip-Select Input. Drive
CS
low to clock data into the MAX1272/MAX1273. See the
Input
Data Format
section.
8
DOUT
Serial Data Output. Data clocks out on the falling edge of SCLK. DOUT is high impedance when
CS
is
high.
A) TEST CIRCUIT FOR V
OH
1k
DOUT
C
LOAD
B) TEST CIRCUIT FOR V
OL
1k
DOUT
C
LOAD
5V
f
SCLK
= 1.4MHz, C
LOAD
= 50pF
Figure 1. Output Load Circuit for Timing Characteristics
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1273EPA+ 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
MAX1273EUA 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
MAX1273EUA+ 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
MAX1273EUA+T 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
MAX1274ACTC 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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