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MAX1245_09

更新时间： 2024-11-05 05:48:59
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美信 - MAXIM /
页数 文件大小 规格书
21页 240K
描述
+2.375V, Low-Power, 8-Channel, Serial 12-Bit ADC

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MAX1245_09 数据手册

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19-1066; Rev 1; 11/09  
+2.375V, Low-Power, 8-Channel,  
Serial 12-Bit ADC  
MAX1245  
________________General Description  
____________________________Features  
The MAX1245 12-bit data-acquisition system combines  
an 8-channel multiplexer, high-bandwidth track/hold, and  
serial interface with high conversion speed and ultra-low  
power consumption. It operates from a single +2.375V to  
+3.3V supply, and its analog inputs are software config-  
urable for unipolar/bipolar and single-ended/differential  
operation.  
♦ Single +2.375V to +3.3V Operation  
♦ 8-Channel Single-Ended or 4-Channel  
Differential Analog Inputs  
♦ Low Power: 0.8mA (100ksps)  
10µA (1ksps)  
1µA (power-down mode)  
The 4-wire serial interface directly connects to SPI™,  
QSPI™, and MICROWIRE™ devices without external  
logic. A serial strobe output allows direct connection to  
TMS320-family digital signal processors. The MAX1245  
works with an external reference, and uses either the  
internal clock or an external serial-interface clock to  
perform successive-approximation analog-to-digital  
conversions.  
♦ Internal Track/Hold, 100kHz Sampling Rate  
♦ SPI/QSPI/MICROWIRE/TMS320-Compatible  
4-Wire Serial Interface  
♦ Software-Configurable Unipolar or Bipolar Inputs  
♦ 20-Pin DIP/SSOP Packages  
________________Ordering Information  
This device provides a hard-wired SHDN pin and a  
software-selectable power-down, and can be pro-  
grammed to automatically shut down at the end of a  
conversion. Accessing the serial interface powers up  
the MAX1245, and the quick turn-on time allows it to be  
shut down between conversions. This technique can  
cut supply current to under 10µA at reduced sampling  
rates.  
INL  
PART*  
TEMP RANGE PIN-PACKAGE  
(LSB)  
±1/2  
±1  
MAX1245ACPP  
MAX1245BCPP  
MAX1245ACAP  
MAX1245BCAP  
MAX1245AEPP  
MAX1245BEPP  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
20 Plastic DIP  
20 Plastic DIP  
20 SSOP  
±1/2  
±1  
20 SSOP  
-40°C to +85°C 20 Plastic DIP  
-40°C to +85°C 20 Plastic DIP  
±1/2  
±1  
The MAX1245 is available in a 20-pin DIP package and  
an SSOP that occupies 30% less area than an 8-pin DIP.  
For supply voltages from +2.7V to +5.25V, use the pin-  
compatible MAX147.  
MAX1245AEAP -40°C to +85°C 20 SSOP  
MAX1245BEAP -40°C to +85°C 20 SSOP  
±1/2  
±1  
*Contact factory for availability of alternate surface-mount packages.  
________________________Applications  
Portable Data Logging  
Medical Instruments  
___________________Pin Configuration  
Battery-Powered Instruments  
Data Acquisition  
TOP VIEW  
___________Typical Operating Circuit  
20  
19  
18  
CH0  
CH1  
1
2
V
DD  
+2.5V  
SCLK  
CS  
CH2  
3
V
DD  
V
CH0  
CH7  
DD  
0V to  
+2.048V  
ANALOG  
INPUTS  
0.1μF  
MAX1245  
CH3  
4
17  
DIN  
DGND  
AGND  
COM  
5
CH4  
16 SSTRB  
15 DOUT  
CH5  
6
CPU  
MAX1245  
CH6  
14  
13  
12  
11  
DGND  
AGND  
7
I/O  
SCK (SK)*  
MOSI (SO)  
CS  
SCLK  
DIN  
8
CH7  
VREF  
+2.048V  
0.1μF  
V
9
COM  
SHDN  
DD  
DOUT  
MISO (SI)  
VREF  
SSTRB  
SHDN  
10  
V
SS  
DIP/SSOP  
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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