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MAX1248AEEE Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1248AEEE Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 24 page _______________General Description The MAX1248/MAX1249 10-bit data-acquisition sys- tems combine a 4-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. They operate from a single +2.7V to +5.25V supply, and their 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 MAX1248/MAX1249 use either the internal clock or an external serial-interface clock to perform successive- approximation analog-to-digital conversions. The MAX1248 has an internal 2.5V reference, while the MAX1249 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 conversion. Accessing the serial interface automatically powers up the MAX1248/MAX1249, and the quick turn-on time allows them to be shut down between all conversions. This technique can cut supply current to under 60µA at reduced sampling rates. The MAX1248/MAX1249 are available in a 16-pin DIP and a very small QSOP that occupies the same board area as an 8-pin SO. For 8-channel versions of these devices, see the MAX148/MAX149 data sheet. ________________________Applications Portable Data Logging Data Acquisition Medical Instruments Battery-Powered Instruments Pen Digitizers System Supervision ____________________________Features o 4-Channel Single-Ended or 2-Channel Differential Inputs o Single +2.7V to +5.25V Operation o Internal 2.5V Reference (MAX1248) 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 to +5.25V, Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-16 ________________________________________________________________ Maxim Integrated Products 1 19-1072; Rev 2; 5/98 PART † MAX1248ACPE MAX1248BCPE MAX1248ACEE 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 _____________Ordering Information Ordering Information continued at end of data sheet. † Contact factory for availability of alternate surface-mount packages. Pin Configuration appears at end of data sheet. MAX1248BCEE 0°C to +70°C 16 QSOP INL (LSB) ±1/2 ±1 ±1/2 ±1 SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. VDD I/O SCK (SK) MOSI (SO) MISO (SI) VSS SHDN SSTRB DOUT DIN SCLK CS COM AGND DGND VDD CH3 C1 4.7 µF C2 0.01 µF C3 0.1 µF CH0 0V TO +2.5V ANALOG INPUTS MAX1248 CPU +3V VREF REFADJ __________Typical Operating Circuit For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. |
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