參數(shù)資料
型號(hào)： MAX187AEPA+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 16/18頁(yè)
文件大小： 0K
描述： IC ADC 12BIT SERIAL LP 8-DIP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 50
位數(shù)： 12
采樣率（每秒）： 75k
數(shù)據(jù)接口： MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 500mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 通孔
封裝/外殼： 8-DIP（0.300"，7.62mm）
供應(yīng)商設(shè)備封裝： 8-PDIP
包裝： 管件
輸入數(shù)目和類(lèi)型： 1 個(gè)單端，單極
MAX187/MAX189
+5V, Low-Power, 12-Bit Serial ADCs
7
Maxim Integrated
Detailed Description#
Converter Operation
The MAX187/MAX189 use input track/hold (T/H) and suc-
cessive approximation register (SAR) circuitry to convert
an analog input signal to a digital 12-bit output. No exter-
nal hold capacitor is needed for the T/H. Figures 3a and
3b show the MAX187/MAX189 in their simplest configu-
ration. The MAX187/MAX189 convert input signals in the
0V to VREF range in 10s, including T/H acquisition time.
The MAX187’s internal reference is trimmed to 4.096V,
while the MAX189 requires an external reference. Both
devices accept external reference voltages from +2.5V to
VDD. The serial interface requires only three digital lines,
SCLK, CS, and DOUT, and provides easy interface to
microprocessors (Ps).
Both converters have two modes: normal and shutdown.
Pulling SHDN low shuts the device down and reduces
supply current to below 10A, while pulling SHDN high or
leaving it floating puts the device into the operational mode.
A conversion is initiated by CS falling. The conversion result
is available at DOUT in unipolar serial format. A high bit,
signaling the end of conversion (EOC), followed by the data
bits (MSB first), make up the serial data stream.
The MAX187 operates in one of two states: (1) internal
reference and (2) external reference. Select internal
reference operation by forcing SHDN high, and external
reference operation by floating SHDN.
Analog Input
Figure 4 illustrates the sampling architecture of the
ADC’s analog comparator. The full-scale input voltage
depends on the voltage at REF.
REFERENCE
ZERO SCALE
FuLL SCALE
Internal Reference
(MAX187 only)
0V
+4.096V
External Reference
0V
VREF
For specified accuracy, the external reference voltage
range spans from +2.5V to VDD.
Figure 1. Load Circuits for DOUT Enable Time
Figure 2. Load Circuits for DOUT Disable Time
DOUT
3kI
CLOAD = 100pF
3kI
DGND
+5V
B. HIGH-Z TO VOL AND VOH TO VOL
A. HIGH-Z TO VOH AND VOL TO VOH
DGND
DOUT
3kI
CLOAD = 100pF
3kI
DGND
+5V
B. VOL TO HIGH-Z
A. VOH TO HIGH-Z
DGND
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX187AEPA+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 75ksps 5.25V 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
MAX187AEWE 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
MAX187AEWE+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 75ksps 5.25V 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
MAX187AEWE+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 75ksps 5.25V 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
MAX187AEWE-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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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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