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MAX148ACAP Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX148ACAP Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 23 page _______________________________________________________________ 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. +2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs 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 SPIK/ QSPIK and MICROWIREK 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 seri- al-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 Q1.5% 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 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 60FA 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 S 8-Channel Single-Ended or 4-Channel Differential Inputs S Single-Supply Operation: +2.7V to +5.25V S Internal 2.5V Reference (MAX149) S Low Power: 1.2mA (133ksps, 3V Supply) 54µA (1ksps, 3V Supply) 1µA (Power-Down Mode) S SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface S Software-Configurable Unipolar or Bipolar Inputs S 20-Pin DIP/SSOP Packages 19-0464; Rev 4; 1/10 Typical Operating Circuit Ordering Information Ordering Information continued at end of data sheet. †Contact factory for availability of alternate surface-mount package. Specify lead-free by placing + by the part number when ordering. *Contact factory for availability of CERDIP package, and for processing to MIL-STD-883B. Not available in lead-free. Pin Configuration appears at end of data sheet. SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. PART† TEMP RANGE PIN- PACKAGE INL (LSB) MAX148ACPP 0°C to +70°C 20PlasticDIP ±1/2 MAX148BCPP 0°C to +70°C 20PlasticDIP ±1 MAX148ACAP 0°C to +70°C 20 SSOP ±1/2 MAX148BCAP 0°C to +70°C 20 SSOP ±1 CPU VDD VSS VDD DGND AGND COM SCLK DIN DOUT SSTRB READJ VREF CH7 CH0 +3V 0.1FF 4.7FF O TO +2.5V ANALOG INPUTS 0.01FF I/O SCK (SK) MOSI (SO) MISO (SI) MAX149 CS SHDN |
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