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MAX146：+2.7V, Low-Power, 8-Channel, Serial 12-Bit ADCs

The MAX146/MAX147 12-bit data-acquisition systems combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. The MAX146 operates from a single +2.7V to +3.6V supply; the MAX147 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 MAX146/MAX147 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions. The MAX146 has an internal 2.5V reference, while the MAX147 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-bar 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 MAX146/MAX147, 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 MAX146/MAX147 are available in 20-pin DIP and SSOP packages. For 4-channel versions of these devices, see the MAX1246/MAX1247 data sheet.

Key Features 8-Channel Single-Ended or 4-Channel Differential Inputs Single-Supply Operation +2.7V to +3.6V (MAX146) +2.7V to +5.25V (MAX147) Internal 2.5V Reference (MAX146) 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 DIP/SSOP Packages

MAX146, MAX147: Typical Operating Circuit Applications/Uses Battery-Powered Applications Data Acquisition Medical Instruments Pen Digitizers Portable Data Logging Process Control

DataSheet

Parametrics

Design kits & evaluation modules

• MAX146EVKIT
• MAX147EVKIT

Quality and Environmental Data

• MAX146.pdf

Related Products

• MAX11637：12-Bit, 300ksps ADCs with Differential Track/Hold, and Internal Reference
• MAX11629：12-Bit, 300ksps ADCs with FIFO and Internal Reference
• MAX144：+2.7V, Low-Power, 2-Channel, 108ksps, Serial 12-Bit ADCs in 8-Pin µMAX
• MAX1246：+2.7V, Low-Power, 4-Channel, Serial 12-Bit ADCs in QSOP-16

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