250ksps、+3V、8/4通道、12位ADC，带有+2.5V电压基准及并行接口

 

器件号	Replacement	Explanation

说明

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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 V_LOGIC pin that allows them to interface directly with a +1.8V to +5.5V digital supply.

Power consumption is only 5.7mW (V_DD = V_LOGIC) 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.

MAX1291、MAX1293：典型工作电路 放大+

关键特性

• 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)

应用

• 数据采集系统
• 数据记录
• 能量管理
• 工业控制系统
• 病人监护
• 触摸屏