MAX188CEAP

ADCs/DACs - Special Purpose Overview

The MAX188CEAP is a low-power, 8-channel, serial 12-bit analog-to-digital converter (ADC) in a 20-pin SSOP package. It integrates an 8-channel multiplexer, high-bandwidth track/hold circuit, and successive-approximation conversion logic. Operating on a single +5V or dual ±5V supply, it supports software-configurable unipolar/bipolar and single-ended/differential inputs. The device features a 4-wire serial interface compatible with SPI, QSPI, and MICROWIRE protocols. Key electrical parameters include a 133ksps sampling rate, 1.5mA operating current, and external reference requirement.

ADCs/DACs - Special Purpose Feature Summary

• 8-Channel Multiplexer: Supports 8 single-ended or 4 differential input channels with software-selectable configuration.
• Serial Interface: 4-wire SPI/QSPI/MICROWIRE/TMS320-compatible interface allowing direct connection without external logic.
• Low Power Consumption: Consumes 1.5mA in operating mode and drops to under 10µA in power-down modes between conversions.
• External Reference: Requires an external reference voltage applied to the VREF pin, utilizing an internal reference-buffer amplifier for gain trimming.

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 suffix (e.g., 'C' for commercial temperature range) and package type (SSOP) when ordering. Confirm RoHS compliance status as indicated by the '+' suffix. Check for availability of evaluation kits if hardware validation is required during the design phase.

ADCs/DACs - Special Purpose Selection Notes

Select the MAX188 over the MAX186 when an external precision reference is preferred or required for system calibration. Ensure the external reference voltage is set to 4.096V for optimal performance specifications. Verify that the application can accommodate the 20-pin SSOP footprint, which occupies 30% less area than an 8-pin PDIP.

ADCs/DACs - Special Purpose Part Context

The MAX188 is part of the MAX186/MAX188 family of low-power, 8-channel, serial 12-bit ADCs. It shares identical architecture and pinout with the MAX186, differing primarily in the reference source; the MAX186 includes an internal 4.096V reference, while the MAX188 requires an external one. Both devices offer similar dynamic performance and power characteristics.

ADCs/DACs - Special Purpose Replacement Considerations

The MAX186CEAP is a functional substitute if the system utilizes an external reference or if the internal reference of the MAX186 is disabled via the REFADJ pin. Other members of the MAX18x family may be considered if pin compatibility and resolution requirements are met.

ADCs/DACs - Special Purpose FAQ

How does the MAX188 handle power consumption during idle periods?

The MAX188 offers two software-selectable power-down modes. In fast power-down mode, current consumption is approximately 30µA. In full power-down mode, it drops to 2µA. Accessing the serial interface automatically powers up the device with a quick turn-on time.

What is the maximum serial clock frequency for data transfer?

When using the internal clock for conversion, the serial interface can operate at frequencies beyond 4MHz. When using an external clock for conversion, the SCLK frequency determines the conversion speed, typically up to 2MHz for specified accuracy.

Can the MAX188 operate with bipolar input signals?

Yes, the analog inputs are software-configurable for unipolar or bipolar operation. In bipolar mode with a -5V negative supply, the input signal range is from -VREF/2 to +VREF/2.