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MAX149：+2.7V至+5.25V、低功耗、8通道、串行10位ADC

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 active-low SHDN pin and a software-selectable power-down, and can be programmed 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 conversions. This technique can cut supply current to under 60µA at reduced sampling rates. The MAX148/MAX149 are available in 20-pin PDIP and 20-pin SSOP packages. For 4-channel versions of these devices, see the MAX1248/MAX1249 data sheet.

关键特性 8-Channel Single-Ended or 4-Channel Differential Inputs Single-Supply Operation: +2.7V to +5.25V Internal 2.5V Reference (MAX149) Low Power: 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 20-Pin PDIP/SSOP Packages

MAX148、MAX149：典型工作电路 应用 电池供电仪表 数据采集 医疗仪器 笔输入量化器 便携式数据记录 过程控制

数据手册DataSheet

关键参数

质量和环境数据

• MAX149.pdf

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• MAX147：+2.7V、低功耗、8通道、串行12位ADC
• MAX1248：+2.7V至+5.25V、低功耗、4通道、串行、10位ADC，QSOP-16封装
• MAX1249：+2.7V至+5.25V、低功耗、4通道、串行、10位ADC，QSOP-16封装

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