參數(shù)資料
型號(hào)： MAX195AMDE
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： ADC
英文描述： 16-Bit, 85ksps ADC with 10レA Shutdown
中文描述： 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP16
封裝： 0.300 INCH, SIDEBRAZED, CERAMIC, DIP-16
文件頁數(shù)： 5/28頁
文件大小： 311K
代理商： MAX195AMDE
_______________Detailed Desc ription
The MAX195 uses a successive-approximation register
(SAR) to convert an analog input to a 16-bit digital
code, which outputs as a serial data stream. The data
bits can be read either during the conversion, at the
CLK clock rate, or between conversions asynchronous
with CLK at the SCLK rate (up to 5Mbps).
The MAX195 includes a capacitive digital-to-analog
converter (DAC) that provides an inherent track/hold
input. The interface and control logic are designed for
easy connection to most microprocessors (μPs), limiting
the need for external components. In addition to the
SAR and DAC, the MAX195 includes a serial interface, a
sampling comparator used by the SAR, ten calibration
DACs, and control logic for calibration and conversion.
The DAC consists of an array of 16 capacitors with
binary weighted values plus one “dummy LSB” capaci-
tor (Figure 1). During input acquisition in unipolar
mode, the array’s common terminal is connected to
AGND and all free terminals are connected to the input
signal (AIN). After acquisition, the common terminal is
disconnected from AGND and the free terminals are
disconnected from AIN, trapping a charge proportional
to the input voltage on the capacitor array.
The free terminal of the MSB (largest) capacitor is con-
nected to the reference (REF), which pulls the common
terminal (connected to the comparator) positive.
Simultaneously, the free terminals of all other capaci-
tors in the array are connected to AGND, which drives
the comparator input negative. If the analog input is
near V
REF
, connecting the MSB’s free terminal to REF
only pulls the comparator input slightly positive.
However, connecting the remaining capacitor’s free ter-
minals to ground drives the comparator input well
below ground, so the comparator input is negative, the
comparator output is low, and the MSB is set high. If
the analog input is near ground, the comparator output
is high and the MSB is low.
Following this, the next largest capacitor is disconnect-
ed from AGND and connected to REF, and the com-
parator determines the next bit. This continues until all
bits have been determined. For a bipolar input range,
the MSB capacitor is connected to REF rather than AIN
during input acquisition, which results in an input range
of V
REF
to -V
REF
.
M
16-Bit, 85ksps ADC with 10μA S hutdown
_______________________________________________________________________________________
5
______________________________________________________________Pin Desc ription
PIN
NAME
FUNCTION
1
BP/UP/
SHDN
Bipolar/Unipolar/Shutdown Input. Three-state input selects bipolar or unipolar input range, or shutdown.
0V = shutdown, +5V = unipolar, floating = bipolar.
2
3
4
5
6
CLK
SCLK
VDDD
DOUT
DGND
Conversion Clock Input
Serial Clock Input is used to shift data out between conversions. May be asynchronous to CLK.
+5V Digital Power Supply
Serial Data Output, MSB first
Digital Ground
7
EOC
End-of-Conversion/Calibration Output—normally low. Rises one clock cycle after the beginning of conversion
or calibration and falls one clock cycle after the end of either. May be used as an output framing signal.
8
CS
Chip-Select Input—active low. Enables the serial interface and the three-state data output (DOUT).
9
CONV
Convert-Start Input—active low. Conversion begins on the falling edge after
CONV
goes low if the input
signal has been acquired; otherwise, on the falling clock edge after acquisition.
10
RESET
Reset Input. Pulling
RESET
low places the ADC in an inactive state. Rising edge resets control logic and
begins calibration.
11
12
13
14
15
16
VSSD
REF
AIN
AGND
VSSA
VDDA
-5V Digital Power Supply
Reference Input, 0 to 5V
Analog Input, 0 to V
REF
unipolar or ±V
REF
bipolar range
Analog Ground
-5V Analog Power Supply
+5V Analog Power Supply
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX195BC/D 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
MAX195BCPE 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Integrated Circuits (ICs) 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
MAX195BCPE+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 85ksps 5V 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
MAX195BCPE+T 制造商:Maxim Integrated Products 功能描述:16-BIT, 85KSPS ADC WITH 10UA SHUTDOWN - Tape and Reel
MAX195BCWE 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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