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MAX1112

更新时间： 2024-09-27 14:57:43
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亚德诺 - ADI /
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20页 376K
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+5V、低功耗、多通道、串行8位ADC

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MAX1112 数据手册

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19-1231; Rev 2; 4/11  
+5V, Low-Power, Multi-Channel,  
Serial 8-Bit ADCs  
General Description  
____________________________Features  
The MAX1112/MAX1113 low-power, 8-bit, 8-channel  
analog-to-digital converters (ADCs) feature an internal  
track/hold, voltage reference, clock, and serial inter-  
face. They operate from a single 4.5V to 5.5V supply  
and consume only 135µA while sampling at rates up to  
50ksps. The MAX1112’s 8 analog inputs and the  
MAX1113’s 4 analog inputs are software-configurable,  
allowing unipolar/bipolar and single-ended/differential  
operation.  
♦ 4.5V to 5.5V Single Supply  
♦ Low Power: 135µA at 50ksps  
13µA at 1ksps  
♦ 8-Channel Single-Ended or 4-Channel Differential  
Inputs (MAX1112)  
♦ 4-Channel Single-Ended or 2-Channel Differential  
Inputs (MAX1113)  
Successive-approximation conversions are performed  
using either the internal clock or an external serial-inter-  
face clock. The full-scale analog input range is deter-  
mined by the 4.096V internal reference, or by an  
♦ Internal Track/Hold; 50kHz Sampling Rate  
♦ Internal 4.096V Reference  
♦ SPI/QSPI/MICROWIRE-Compatible Serial Interface  
♦ Software-Configurable Unipolar or Bipolar Inputs  
externally applied reference ranging from 1V to V  
.
DD  
The 4-wire serial interface is compatible with the SPI™,  
QSPI™, and MICROWIRE™ serial-interface standards.  
A serial-strobe output provides the end-of-conversion  
signal for interrupt-driven processors.  
♦ Total Unadjusted Error: 1 LSB (max)  
0.3 LSB (typ)  
The MAX1112/MAX1113 have a software-program-  
mable, 2µA automatic power-down mode to minimize  
power consumption. Using power-down, the supply  
current is reduced to 13µA at 1ksps, and only 82µA at  
10ksps. Power-down can also be controlled using the  
SHDN input pin. Accessing the serial interface automat-  
ically powers up the device.  
Ordering Information continued at end of data sheet.  
Functional Diagram  
CS  
SCLK  
The MAX1112 is available in a 20-pin SSOP package.  
The MAX1113 is available in a small 16-pin QSOP  
package.  
INPUT  
INT  
SHIFT  
REGISTER  
DIN  
CLOCK  
CONTROL  
LOGIC  
SHDN  
________________________Applications  
Portable Data Logging  
CH0  
CH1  
CH2  
OUTPUT  
SHIFT  
REGISTER  
DOUT  
SSTRB  
ANALOG  
INPUT  
MUX  
Hand-Held Measurement Devices  
Medical Instruments  
CH3  
T/H  
CH4*  
CH5*  
CH6*  
CH7*  
CLOCK  
IN  
8-BIT  
SAR ADC  
OUT  
System Diagnostics  
REF  
V
DD  
COM  
Solar-Powered Remote Systems  
DGND  
AGND  
+4.096V  
REFERENCE  
REFOUT  
MAX1112  
MAX1113  
4mA to 20mA-Powered Remote  
Data-Acquisition Systems  
REFIN  
*MAX1112 ONLY  
Pin Configurations appear at end of data sheet.  
SPI and QSPI are trademarks of Motorola, Inc.  
MICROWIRE is a trademark of National Semiconductor Corp.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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