General Description

The MAX1294/MAX1296 low-power, 12-bit analog-to-digital converters (ADCs) feature a successive-approximation ADC, automatic power-down, fast wake-up (2µs), an on-chip clock, +2.5V internal reference, and a high-speed 12-bit parallel interface. They operate with a single +5V analog supply.

Power consumption is only 10mW at the maximum sampling rate of 420ksps. Two software-selectable power down modes enable the MAX1294/MAX1296 to be shut down between conversions; accessing the parallel interface returns them to normal operation. Powering down between conversions can reduce supply below 10µA at lower sampling rates.

Both devices offer software-configurable analog inputs for unipolar/bipolar and single-ended/pseudo-differential operation. In single-ended mode, the MAX1294 has six input channels and the MAX1296 has two (three input channels and one input channel, respectively, when in pseudo-differential mode).

Excellent dynamic performance and low power, combined with ease of use and small package size, make these converters ideal for battery-powered and data acquisition applications or for other circuits with demanding power-consumption and space requirements

The MAX1294/MAX1296 tri-states INT when CS goes high. Refer to MAX1266/MAX1268 if tri-stating INT is not desired.

The MAX1294 is offered in a 28-pin QSOP package, while the MAX1296 is available in a 24-pin QSOP. For pin-compatible +3V, 12-bit versions, see the MAX1295/MAX1297.

Features

♦ 12-Bit Resolution, ±0.5 LSB Linearity

♦ Single +5V Operation

♦ Internal +2.5V Reference

♦ Software-Configurable Analog Input Multiplexer

6-Channel Single-Ended/

3-Channel Pseudo-Differential (MAX1294)

2-Channel Single-Ended/

1-Channel Pseudo-Differential (MAX1296)

♦ Software-Configurable Unipolar/Bipolar Analog Inputs

♦ Low Current

2.8mA (420ksps)

1.0mA (100ksps)

400µA (10ksps)

2µA (Shutdown)

♦ Internal 6MHz Full-Power Bandwidth Track/Hold

♦ Parallel 12-Bit Interface

♦ Small Footprint

28-Pin QSOP (MAX1294)

24-Pin QSOP (MAX1296)

Applications

Industrial Control

Systems Data Logging

Energy Management

Patient Monitoring

Data-Acquisition Systems

Touchscreens