MAX1091ACEI+T
MAX1091ACEI+T - 250ksps 10-Bit 8-Ch ADC w/ 2.5V Ref | Maxim
The Maxim Integrated (Analog Devices) MAX1091ACEI+T is a 250 ksps, low-power, 10-bit, 8/4-channel analog-to-digital converter (ADC) with an on-chip +2.5V reference and a high-speed byte-wide parallel interface, housed in a 28-pin QSOP package. The device operates from a single +3V supply, features automatic power-down between conversions, and wakes up in 2 us, making it suitable for power-conscious multi-channel data-acquisition systems. The internal 2.5V reference eliminates the need for an external reference IC in typical applications.
A successive-approximation register (SAR) ADC is a converter architecture that digitizes an analog input by performing a binary search through an internal precision DAC over one or more clock cycles per conversion. SAR ADCs are valued for their deterministic latency, low power consumption, no pipeline delay, and strong AC performance at moderate sample rates - characteristics that position them between flash converters (fastest, lowest resolution) and sigma-delta ADCs (highest resolution, slower). The MAX1091 belongs to the broader category of data converters / signal conditioning ICs within the analog semiconductor family. Its 8 single-ended or 4 pseudo-differential input channels, byte-wide parallel output, and integrated reference make it a complete system-level analog front-end for embedded designs.
Key features include 8 analog input channels (configurable as 4 pseudo-differential pairs), a +2.5V internal reference, automatic power-down with 2 us wake-up, an internal conversion clock, and a high-speed byte-wide parallel digital interface. The +3V single-supply operation simplifies power tree design in 3.3V systems, and the auto-power-down function dramatically reduces average current draw in low-duty-cycle applications such as battery-powered instrumentation.
The MAX1091 uses a classic SAR core with a sample-and-hold front end configured as MUX-S/H-ADC with a 1:1 input-to-ADC ratio. The high-speed parallel interface allows direct connection to microcontrollers, DSPs, or FPGAs without glue logic, while the internal reference removes a typical external component and PCB area. The 28-pin QSOP package balances compactness with hand-solder-friendly lead pitch, supporting both high-density and prototype builds.
Typical applications include portable data loggers, multi-channel sensor interfaces (temperature, pressure, strain), industrial process control, patient monitors and point-of-care diagnostics, and optical encoders. The combination of 10-bit resolution and 250 ksps throughput is well-matched to these mid-bandwidth, multi-channel systems where deterministic conversion timing is important.
When designing with the MAX1091, ensure that the supply decoupling network (typically 0.1 uF ceramic in parallel with 4.7 uF bulk) is placed within a few millimetres of the AVDD and DVDD pins. Use the internal reference (REF bypassed with 0.1 uF) unless absolute accuracy below +/-1 LSB is required - in that case, drive REF with an external low-drift reference and account for that reference's settling behavior at full sample rate.
This page consolidates distributor pricing, parametric specifications, drop-in alternatives, and PCB design guidance not found in the standalone datasheet, enabling faster part selection and qualification.
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