MAX1291BCEI+

Analog To Digital Converters (ADC) Overview

The MAX1291BCEI+ is a low-power, 12-bit analog-to-digital converter (ADC) featuring a successive-approximation architecture. It operates with a single +3V analog supply and includes an on-chip clock, a +2.5V internal reference, and a byte-wide parallel interface. The device supports up to 250ksps sampling rate with power consumption of 5.7mW at maximum speed. It offers software-configurable analog inputs for unipolar/bipolar and single-ended/pseudo-differential operation, providing eight input channels in single-ended mode or four in pseudo-differential mode. The part is housed in a 28-pin QSOP package.

Analog To Digital Converters (ADC) Feature Summary

• Software-selectable power-down modes enable rapid wake-up and reduced current consumption between conversions.
• Integrated track-and-hold stage with high-speed full-power bandwidth allows undersampling techniques for high-frequency transients.
• Flexible logic interface via VLOGIC pin supports direct connection to digital supplies ranging from +1.8V to +5.5V.

Analog To Digital Converters (ADC) Applications

• Industrial Control Systems
• Data Logging
• Patient Monitoring

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'B' indicates ±1 LSB INL/DNL linearity compared to the 'A' variant. Confirm the 'C' suffix denotes the commercial temperature range of 0°C to +70°C. Ensure the 'E' suffix corresponds to the 28-pin QSOP package type. Cross-reference the datasheet revision to confirm pinout compatibility with existing designs.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a 12-bit resolution and 250ksps throughput are required within a compact form factor. The internal +2.5V reference simplifies design by reducing external component count. Consider the parallel interface requirements and ensure the host microprocessor can manage the control byte configuration for channel selection and acquisition modes effectively.

Analog To Digital Converters (ADC) Part Context

This device belongs to the MAX1291/MAX1293 family of precision ADCs. The MAX1291 variant specifically provides eight single-ended or four pseudo-differential channels, whereas the MAX1293 offers four single-ended or two pseudo-differential channels. Both share identical electrical characteristics and packaging options, differing primarily in channel count and pin assignment.

Analog To Digital Converters (ADC) Replacement Considerations

For pin-compatible +5V versions, refer to the MAX1290/MAX1292 data sheet. If tri-stating the INT signal upon CS going high is not desired, consider the MAX1261/MAX1263 as alternative devices.