ADC Single SAR 250ksps 12-bit Parallel 28-Pin QSOP

The MAX1291/MAX1293 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, byte-wide parallel interface. They operate with a single +3V analog supply and feature a VLOGIC pin that allows them to interface directly with a +1.8V to +5.5V digital supply. Power consumption is only 5.7mW (VDD = VLOGIC) at the maximum sampling rate of 250ksps. Two software-selectable power-down modes enable the MAX1291/MAX1293 to be shut down between conversions; accessing the parallel interface returns them to normal operation. Powering down between conversions can cut supply current to under 10µA at reduced sampling rates. Both devices offer software-configurable analog inputs for unipolar/bipolar and single-ended/pseudo-differential operation. In single-ended mode, the MAX1291 has eight input channels and the MAX1293 has four input channels (four and two input channels, 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 MAX1291/MAX1293 tri-states active-low INT when active-low CS goes high. Refer to MAX1261/MAX1263 if tri-stating active-low INT is not desired. The MAX1291 is available in a 28-pin QSOP package, while the MAX1293 is available in a 24-pin QSOP. For pin-compatible +5V, 12-bit versions, refer to the MAX1290/MAX1292 data sheet.

• 12-Bit Resolution, ±0.5 LSB Linearity
• +3V Single Operation
• User-Adjustable Logic Level (+1.8V to +3.6V)
• Internal +2.5V Reference
• Software-Configurable, Analog Input Multiplexer
  • 8-Channel Single-Ended/4-Channel Pseudo-Differential (MAX1291)
  • 4-Channel Single-Ended/2-Channel Pseudo-Differential (MAX1293)

Software-Configurable, Unipolar/Bipolar Inputs

Low Power:

• 1.9mA (250ksps)
• 1.0mA (100ksps)
• 400µA (10ksps)
• 2µA (Shutdown)

Internal 3MHz Full-Power Bandwidth Track/Hold

Byte-Wide Parallel (8 + 4) Interface

Small Footprint:

• 28-Pin QSOP (MAX1291)
• 24-Pin QSOP (MAX1293)