MAX186DEAP-T

ADCs/DACs - Special Purpose Overview

The MAX186DEAP-T is a low-power, 8-channel, serial 12-bit analog-to-digital converter (ADC) from the MAX186/MAX188 family. It integrates an 8-channel multiplexer, high-bandwidth track/hold circuitry, and a successive-approximation ADC core. The device operates on a single +5V supply or dual ±5V supplies and features software-configurable unipolar/bipolar and single-ended/differential input modes. It includes an internal 4.096V reference and a reference-buffer amplifier. The part utilizes a 4-wire serial interface compatible with SPI, QSPI, Microwire, and TMS320 DSPs. Key electrical specifications include a 133ksps sampling rate, 1.5mA operating current, and 2µA power-down current.

ADCs/DACs - Special Purpose Feature Summary

• 8-Channel Single-Ended or 4-Channel Differential Inputs
• Internal 4.096V Reference with Buffer Amplifier
• Low Power: 1.5mA Operating Mode, 2µA Power-Down Mode
• Internal Track/Hold with 133kHz Sampling Rate

ADCs/DACs - Special Purpose Applications

• Portable Data Logging
• Data-Acquisition Systems
• High-Accuracy Process Control
• Automatic Testing Equipment
• Battery-Powered Instruments

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific grade (A, B, C, or D) required for the application, as accuracy parameters vary by grade. Confirm that the SSOP package variant is available in the desired temperature range (-40°C to +85°C). Check factory availability for A-grade devices in SSOP packages, as they may have limited stock. Ensure the ordering suffix matches the required lead-free/RoHS compliance status.

ADCs/DACs - Special Purpose Selection Notes

Select the MAX186 variant if an internal 4.096V reference is preferred; choose MAX188 for external reference requirements. Consider the operating mode: use internal clock mode for simplified microprocessor timing or external clock mode for precise synchronization. Evaluate source impedance impacts on acquisition time; keep source impedance below 5kΩ for optimal AC performance or add input capacitors for higher impedances.

ADCs/DACs - Special Purpose Part Context

The MAX186DEAP-T belongs to the MAX186/MAX188 series of low-power, 8-channel, serial 12-bit ADCs. These devices are designed for data-acquisition systems requiring high conversion speed and ultra-low power consumption. The series supports both single +5V and dual ±5V supply configurations, making it suitable for various industrial and portable applications.

ADCs/DACs - Special Purpose Replacement Considerations

Direct replacements within the same family include MAX186CEWP+ (C-grade, SOIC), MAX186EWP+ (E-grade, SOIC), and MAX186CAP+ (C-grade, SSOP). For external reference needs, consider the MAX188 variants. Verify pin compatibility and electrical characteristics, particularly differential nonlinearity and integral nonlinearity specs, which differ between grades A, B, C, and D.

ADCs/DACs - Special Purpose FAQ

What is the difference between MAX186 and MAX188?

The MAX186 includes an internal 4.096V reference, while the MAX188 requires an external reference voltage applied to the VREF pin.

How does the SHDN pin function?

Pulling the SHDN pin low shuts down the device to under 10µA supply current. Pulling it high enables the reference-buffer amplifier in internal compensation mode. Leaving it unconnected sets the amplifier to external compensation mode.

What is the maximum serial clock frequency?

The serial interface can operate beyond 4MHz when using the internal clock. In external clock mode, the SCLK frequency determines the conversion speed, typically up to 2MHz for specified accuracy.

Can the inputs be configured as differential?

Yes, the analog inputs are software configurable for single-ended or differential operation. In differential mode, inputs are selected from pairs CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7.