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MAX1280B：400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference

The MAX1280/MAX1281 12-bit ADCs combine an 8-channel analog-input multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. The MAX1280 operates from a single +4.5V to +5.5V supply; the MAX1281 operates from a single +2.7V to +3.6V supply. Both devices' analog inputs are software configurable for unipolar/bipolar and single-ended/pseudo-differential operation. The 4-wire serial interface connects directly to SPI™/QSPI™/MICROWIRE™ devices without external logic. A serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX1280/MAX1281 use an external serial-interface clock to perform successive-approximation analog-to-digital conversions. Both parts feature an internal +2.5V reference and a reference-buffer amplifier with a ±1.5% voltage-adjustment range. An external reference with a 1V to VDD1 range may also be used. The MAX1280/MAX1281 provide a hard-wired active-low SHDN pin and four software-selectable power modes (normal operation, reduced power, fast power-down, and full power-down). These devices can be programmed to automatically shut down at the end of a conversion or to operate with reduced power. When using the power-down modes, accessing the serial interface automatically powers up the devices, and the quick turn-on time allows them to be powered down between all conversions. This technique can cut supply current to under 100µA at reduced sampling rates. The MAX1280/MAX1281 are available in 20-pin TSSOP packages. These devices are higher-speed versions of the MAX146/MAX147 (for more information, see the respective data sheet).

Key Features 8-Channel Single-Ended or 4-Channel Pseudo-Differential Inputs Internal Multiplexer and Track/Hold Single-Supply Operation +4.5V to +5.5V (MAX1280) +2.7V to +3.6V (MAX1281) Internal +2.5V Reference 400ksps Sampling Rate (MAX1280) Low Power 2.5mA (400ksps) 1.3mA (Reduced-Power Mode) 0.9mA (Fast Power-Down Mode) 2µA (Full Power-Down) SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface Software-Configurable Unipolar or Bipolar Inputs 20-Pin TSSOP Package

MAX1280, MAX1280B, MAX1281, MAX1281B: 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

• MAX1280EVC16
• MAX1280EVKIT

Related Products

• MAX11637：12-Bit, 300ksps ADCs with Differential Track/Hold, and Internal Reference
• MAX11629：12-Bit, 300ksps ADCs with FIFO and Internal Reference
• MAX1284：400ksps/300ksps, Single-Supply, Low-Power, Serial 12-Bit ADCs with Internal Reference
• MAX1283：300ksps/400ksps, Single-Supply, 4-Channel, Serial 12-Bit ADCs with Internal Reference
• MAX1282：300ksps/400ksps, Single-Supply, 4-Channel, Serial 12-Bit ADCs with Internal Reference
• MAX146：+2.7V, Low-Power, 8-Channel, Serial 12-Bit ADCs

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