MAX1117EKA+T

Analog To Digital Converters (ADC) Overview

The MAX1117EKA+T is a single-supply, low-power, dual-channel analog-to-digital converter (ADC) featuring an internal track/hold circuit and voltage reference. It provides 8-bit resolution with a sampling rate up to 100ksps using an internal clock. The device operates within a supply voltage range of +2.7V to +3.6V and consumes 175µA at 100ksps. It includes an automatic shutdown mode reducing current to less than 1µA. The part utilizes a 3-wire serial interface compatible with SPI, QSPI, and MICROWIRE protocols. It is housed in an 8-pin SOT-23 package.

Analog To Digital Converters (ADC) Feature Summary

• Dual-channel input architecture with integrated track/hold circuitry for accurate signal acquisition.
• Internal voltage reference providing a fixed full-scale input range without external components.
• Automatic power-down functionality that minimizes supply current when the device is idle.
• Serial interface supporting direct connection to microprocessors without additional logic.

Analog To Digital Converters (ADC) Applications

• Low-power handheld portable devices
• Battery-powered test equipment
• System diagnostics
• 4mA to 20mA powered remote data acquisition systems

Analog To Digital Converters (ADC) Procurement Notes

Verify the component marking code AADW on the top surface to confirm authenticity. Ensure the operating temperature range meets the -40°C to +85°C specification required by the application environment. Confirm the package type matches the 8-pin SOT-23 footprint during PCB layout review.

Analog To Digital Converters (ADC) Selection Notes

Select this model specifically for applications requiring operation between +2.7V and +3.6V. The MAX1117 variant includes an internal +2.048V reference, distinguishing it from the MAX1118 which supports external references. Verify that the system power budget accommodates the typical 175µA consumption at maximum sampling rates.

Analog To Digital Converters (ADC) Part Context

This component belongs to the MAX1117/MAX1118/MAX1119 family of low-power ADCs manufactured by Analog Devices Inc./Maxim Integrated. All members share identical pinouts and core architectures but differ in supply voltage specifications and reference configurations. The EKA suffix indicates the commercial temperature grade and SOT-23 packaging.

Analog To Digital Converters (ADC) Replacement Considerations

MAX1118EKA+T: Compatible if external reference is used and supply voltage exceeds 3.6V.

Analog To Digital Converters (ADC) FAQ

How does the device handle channel switching?

Channel selection is managed via the CNVST pin. Toggling CNVST high and low initiates a conversion on CH0. A second toggle switches the input multiplexer to CH1 for the subsequent conversion.

What is the recommended source impedance for accurate sampling?

A source impedance lower than 1.5kΩ is recommended to ensure accurate sample settling. Adding a 100pF capacitor at the ADC inputs can further improve sampling accuracy.

Can the device operate with an external reference?

No, the MAX1117EKA+T features an internal +2.048V reference. External reference capability is only available on the MAX1118 variant.