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MAX149BCAP Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX149BCAP Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 24 page General Description The MAX148/MAX149 10-bit data-acquisition systems combine an 8-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 sample to 133ksps. 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 MAX148/ MAX149 use either the internal clock or an external serial- interface clock to perform successive-approximation analog-to-digital conversions. The MAX149 has an internal 2.5V reference, while the MAX148 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 MAX148/MAX149, 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 MAX148/MAX149 are available in a 20-pin DIP and a 20-pin SSOP. For 4-channel versions of these devices, see the MAX1248/MAX1249 data sheet. ________________________Applications Portable Data Logging Data Acquisition Medical Instruments Battery-Powered Instruments Pen Digitizers Process Control ____________________________Features o 8-Channel Single-Ended or 4-Channel Differential Inputs o Single-Supply Operation: +2.7V to +5.25V o Internal 2.5V Reference (MAX149) 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 20-Pin DIP/SSOP Packages +2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs ________________________________________________________________ Maxim Integrated Products 1 VDD I/O SCK (SK) MOSI (SO) MISO (SI) VSS SHDN SSTRB DOUT DIN SCLK CS COM AGND DGND VDD CH7 4.7 µF 0.1 µF CH0 0V TO +2.5V ANALOG INPUTS MAX149 CPU +3V VREF 0.01 µF REFADJ __________Typical Operating Circuit 19-0464; Rev 2; 5/98 PART † MAX148ACPP MAX148BCPP MAX148ACAP 0°C to +70°C 0°C to +70°C 0°C to +70°C TEMP. RANGE PIN-PACKAGE 20 Plastic DIP 20 Plastic DIP 20 SSOP EVALUATION KIT AVAILABLE Ordering Information Ordering Information continued at end of data sheet. † Contact factory for availability of alternate surface-mount packages. MAX148BCAP 0°C to +70°C 20 SSOP INL (LSB) ±1/2 ±1 ±1/2 ±1 SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. Pin Configuration appears at end of data sheet. 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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