Analog Devices Inc./Maxim Integrated MAX1113CPE+

Overview

The MAX1113CPE+ from Maxim Integrated is a low-power, 4-channel, 8-bit successive-approximation analog-to-digital converter (ADC) with integrated track/hold, 4.096V internal reference, SPI/QSPI/MICROWIRE-compatible serial interface, and software-configurable unipolar/bipolar and single-ended/differential input modes. It operates from a single 4.5V–5.5V supply and draws only 135µA at 50ksps sampling rate, making it suitable for portable data loggers and hand-held measurement devices.

For engineers reviewing the MAX1113CPE+ datasheet, MAX1113CPE+ pinout, MAX1113CPE+ application, or MAX1113CPE+ equivalent, key selection considerations include its 4-channel analog input flexibility, 13µA power-down current at 1ksps, ±1 LSB total unadjusted error, 50ksps max sampling rate, and QSOP-16 package compatibility with space-constrained embedded systems.

Technical Context

The MAX1113CPE+ implements a successive-approximation register (SAR) architecture with an internal track/hold circuit enabling 50kHz small-signal bandwidth and 1.5MHz full-power bandwidth. Conversion timing is controlled either by an internal clock (25µs typical conversion time) or externally via SCLK (10 clocks/conversion cycle at up to 500kHz).

Its analog front-end supports four single-ended or two differential input pairs (CH0/CH1, CH2/CH3), with common-mode range from AGND to VDD and input voltage tolerance of (AGND − 0.3V) to (VDD + 0.3V). The 4.096V internal reference provides ±0.8ppm/°C gain temperature coefficient and can be overridden by an external 1V–VDD reference applied to REFIN.

Key Specifications

Pinout & Package

The MAX1113CPE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), optimized for compact PCB layouts in portable instrumentation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit multi-channel ADC applications.

Compared with ADS7822U and MAX1110CPE+, the MAX1113CPE+ uniquely combines internal 4.096V reference, bipolar/single-ended configurability, and 13µA power-down in a drop-in QSOP-16 footprint-making it optimal for battery-constrained, multi-signal industrial and medical endpoints.

Availability

The MAX1113CPE+ is available at Aetrix Electronics and suitable for portable data logging, hand-held measurement devices, and solar-powered remote systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX1113CPE+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.

The MAX1112/MAX1113 family was designed specifically for low-power, multi-channel data acquisition in space- and energy-constrained embedded systems, emphasizing integration of reference, track/hold, and serial interface in a single 5V-compatible device.

FAQ

What is the maximum sampling rate of the MAX1113CPE+ and under what conditions is it achieved?

The MAX1113CPE+ achieves a maximum sampling rate of 50ksps when using an external 500kHz SCLK in external clock mode with 10 clocks per conversion cycle. This requires proper decoupling (1µF at REFOUT, 0.1µF + 1µF at VDD), stable COM reference, and source impedance ≤2.4kΩ to maintain AC performance. At lower clock frequencies or in internal clock mode, the effective rate drops to 40ksps or less due to fixed 25µs conversion time.

Does the MAX1113CPE+ support differential input mode, and how is it configured?

Yes, the MAX1113CPE+ supports two differential input pairs: CH0–CH1 and CH2–CH3. Configuration is performed via the SGL/DIF bit (bit 2) in the 8-bit control byte: setting SGL/DIF = 0 selects differential mode. In this mode, the device samples the voltage difference (CH0 − CH1 or CH2 − CH3), with common-mode range extending from AGND to VDD. The COM pin serves as the reference node and must remain stable to ±0.5 LSB.

How does the power-down feature of the MAX1113CPE+ operate, and what is its lowest current consumption?

The MAX1113CPE+ offers two power-down methods: software-controlled (PD1/PD0 bits in control byte) and hardware-controlled (SHDN pin). In software power-down at 1ksps, supply current drops to 13µA (typ). When SHDN is pulled low, current falls further to 10µA (max). Power-down disables the internal reference and analog circuitry but retains register state; serial interface access automatically wakes the device.

Can the MAX1113CPE+ use an external reference, and what is the acceptable voltage range?

Yes, the MAX1113CPE+ accepts an external reference voltage applied to the REFIN pin. The valid range is 1V to VDD (4.5V–5.5V), allowing flexibility for custom full-scale ranges. When using an external reference, the internal 4.096V reference is disabled, and REFOUT becomes high-impedance. Accuracy and temperature drift then depend entirely on the external reference's specifications.

What are the absolute maximum ratings for analog input voltage on the MAX1113CPE+?

The MAX1113CPE+ analog input pins (CH0–CH3, COM, REFIN, REFOUT) tolerate voltages from (AGND − 0.3V) to (VDD + 0.3V) without damage, thanks to internal protection diodes. However, for accurate conversions near full scale, input signals must stay within AGND + 50mV to VDD − 50mV. Exceeding these limits risks forward-biasing protection diodes on inactive channels, potentially injecting current into the substrate.