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MAX147

更新时间： 2024-11-08 23:45:43
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美信 - MAXIM /
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24页 652K
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+2.7V.Low-Power.8-Channel.Serial 12-Bit ADCs

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MAX147 数据手册

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19-0465; Rev 2; 10/01  
+2.7V, Low-Power, 8-Channel,  
Serial 12-Bit ADCs  
General Description  
____________________________Features  
The MAX146/MAX147 12-bit data-acquisition systems  
combine an 8-channel multiplexer, high-bandwidth  
track/hold, and serial interface with high conversion  
speed and low power consumption. The MAX146 oper-  
ates from a single +2.7V to +3.6V supply; the MAX147  
operates from a single +2.7V to +5.25V supply. Both  
devices’ analog inputs are software configurable for  
unipolar/bipolar and single-ended/differential operation.  
ꢀ 8-Channel Single-Ended or 4-Channel  
Differential Inputs  
ꢀ Single-Supply Operation  
+2.7V to +3.6V (MAX146)  
+2.7V to +5.25V (MAX147)  
ꢀ Internal 2.5V Reference (MAX146)  
ꢀ Low Power  
The 4-wire serial interface connects directly to SPI™/  
QSPI™ and MICROWIRE™ devices without external  
logic. A serial strobe output allows direct connection to  
TMS320-family digital signal processors. The  
MAX146/MAX147 use either the internal clock or an exter-  
nal serial-interface clock to perform successive-approxi-  
mation analog-to-digital conversions.  
1.2mA (133ksps, 3V supply)  
54µA (1ksps, 3V supply)  
1µA (power-down mode)  
ꢀ SPI/QSPI/MICROWIRE/TMS320-Compatible  
4-Wire Serial Interface  
ꢀ Software-Configurable Unipolar or Bipolar Inputs  
The MAX146 has an internal 2.5V reference, while the  
MAX147 requires an external reference. Both parts have  
a reference-buffer amplifier with a 1.5ꢀ voltage-  
adjustment range.  
ꢀ 20-Pin DIP/SSOP Packages  
Ordering Information  
INL  
These devices provide 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 con-  
version. Accessing the serial interface automatically  
powers up the MAX146/MAX147, and the quick turn-on  
time allows them to be shut down between all conver-  
sions. This technique can cut supply current to under  
60µA at reduced sampling rates.  
PART  
TEMP RANGE PIN-PACKAGE  
(LSB)  
MAX146ACPP  
MAX146BCPP  
MAX146ACAP  
MAX146BCAP  
MAX146BC/D  
0°C to +70°C  
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
1/2  
1
20 SSOP  
Dice*  
1
Ordering Information continued at end of data sheet.  
*Dice are specified at T = +25°C, DC parameters only.  
The MAX146/MAX147 are available in 20-pin DIP and  
SSOP packages.  
A
For 4-channel versions of these devices, see the  
MAX1246/MAX1247 data sheet.  
Typical Operating Circuit  
________________________Applications  
+3V  
Portable Data Logging Data Acquisition  
V
V
CH0  
DD  
DD  
0.1µF  
Medical Instruments  
Pen Digitizers  
Battery-Powered Instruments  
Process Control  
0V TO  
+2.5V  
ANALOG  
INPUTS  
DGND  
MAX146  
AGND  
COM  
CPU  
CH7  
I/O  
VREF  
CS  
4.7µF  
SCLK  
SCK (SK)  
MOSI (SO)  
MISO (SI)  
DIN  
Pin Configuration appears at end of data sheet.  
DOUT  
REFADJ  
0.047µF  
SSTRB  
SHDN  
V
SS  
SPI and QSPI are registered trademarks of Motorola, Inc.  
MICROWIRE is a registered trademark of National Semiconductor  
Corp.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...24

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