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MAX1247BMJE Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1247BMJE Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 24 page For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 _______________General Description The MAX1246/MAX1247 12-bit data-acquisition systems combine a 4-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. The MAX1246 oper- ates from a single +2.7V to +3.6V supply; the MAX1247 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. 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 MAX1246/MAX1247 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to- digital conversions. The MAX1246 has an internal 2.5V reference, while the MAX1247 requires an external reference. Both parts have a reference-buffer amplifier with a ±1.5% voltage- adjustment range. 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 MAX1246/MAX1247, 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. The MAX1246/MAX1247 are available in a 16-pin DIP and a small QSOP that occupies the same board area as an 8-pin SO. For 8-channel versions of these devices, see the MAX146/MAX147 data sheet. ________________________Applications Portable Data Logging Data Acquisition Medical Instruments Battery-Powered Instruments Pen Digitizers Process Control ____________________________Features o 4-Channel Single-Ended or 2-Channel Differential Inputs o Single-Supply Operation: +2.7V to +3.6V (MAX1246) +2.7V to +5.25V (MAX1247) o Internal 2.5V Reference (MAX1246) o Low Power: 1.2mA (133ksps, 3V supply) 54µA (1ksps, 3V supply) 1µA (power-down mode) o SPI/QSPI/Microwire/TMS320-Compatible 4-Wire Serial Interface o Software-Configurable Unipolar or Bipolar Inputs o 16-Pin QSOP Package (same area as 8-pin SO) +2.7V, Low-Power, 4-Channel, Serial 12-Bit ADCs in QSOP-16 ________________________________________________________________ Maxim Integrated Products 1 VDD I/O SCK (SK) MOSI (SO) MISO (SI) VSS SHDN SSTRB DOUT DIN SCLK CS COM AGND DGND VDD CH3 4.7 µF 0.1 µF CH0 0V TO +2.5V ANALOG INPUTS MAX1246 CPU +3V VREF 0.047 µF REFADJ __________Typical Operating Circuit 19-1071; Rev 1; 3/97 PART † MAX1246ACPE MAX1246BCPE MAX1246ACEE 0°C to +70°C 0°C to +70°C 0°C to +70°C TEMP. RANGE PIN-PACKAGE 16 Plastic DIP 16 Plastic DIP 16 QSOP EVALUATION KIT AVAILABLE ______________Ordering Information Ordering Information continued at end of data sheet. † Contact factory for availability of alternate surface-mount packages. MAX1246BCEE 0°C to +70°C 16 QSOP INL (LSB) ±1/2 ±1 ±1/2 ±1 SPI and QSPI are registered trademarks of Motorola, Inc. Microwire is a registered trademark of National Semiconductor Corp. Pin Configuration appears at end of data sheet. |
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