Analog Devices Inc./Maxim Integrated MAX1415EPE+

Overview

The MAX1415EPE+ from Maxim Integrated is a 16-bit, low-power, 2-channel sigma-delta analog-to-digital converter (ADC) with integrated PGA (gain 1–128), on-chip input buffer, and internal oscillator (1 MHz or 2.4576 MHz). It delivers no missing codes, ±0.0015% INL (max), and >98 dB 50/60 Hz rejection - optimized for high-precision industrial sensor interfaces including strain-gauge and RTD measurements.

For engineers reviewing the MAX1415EPE+ datasheet, MAX1415EPE+ pinout, MAX1415EPE+ application, or MAX1415EPE+ equivalent, this device supports SPI/QSPI/MICROWIRE serial interfacing, operates from 2.7V to 3.6V, achieves 1.2 mW max power dissipation at 3V, and enables on-demand offset/gain self-calibration - critical for loop-powered systems and weigh-scale front-ends requiring DC accuracy and noise immunity.

Technical Context

The MAX1415EPE+ implements a second-order sigma-delta modulator followed by a digital filter, delivering true 16-bit resolution with monotonic output and no missing codes across its full operating temperature range (–40°C to +85°C). Its architecture includes fully differential analog inputs (AIN1±, AIN2±), programmable gain amplifier, and optional input buffering - enabling flexible signal conditioning before digitization.

It features dual-clock operation: either an internal oscillator (selectable 1 MHz or 2.4576 MHz via CLK pin) or external clock input (400 kHz–2.5 MHz), with timing-critical outputs (DOUT, DRDY, CLKOUT) synchronized to SCLK. The device supports both unipolar and bipolar input ranges referenced to an external differential reference (REF±), with calibration registers accessible via its serial interface.

Key Specifications

Pinout & Package

MAX1415EPE+ is housed in a 16-pin PDIP (Plastic Dual In-line Package) with 0.3-inch body width and standard through-hole mounting. Pin spacing is 0.1 inch (2.54 mm), compatible with legacy prototyping and industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar sigma-delta ADC applications.

Compared with AD7705BRZ, the MAX1415EPE+ integrates a selectable-frequency oscillator and achieves lower active current; compared with ADS1220IPWR, it offers proven 16-bit stability at significantly lower power and cost, making it optimal for industrial 4–20 mA transmitters and portable instrumentation where 16-bit fidelity suffices.

Availability

MAX1415EPE+ is available at Aetrix Electronics and suitable for industrial instruments, weigh scales, strain-gauge measurement systems, and loop-powered transmitters requiring stable component supply, long-lifecycle assurance, and traceable sourcing.

Supply support for MAX1415EPE+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.

The MAX1415EPE+ belongs to Maxim's precision sigma-delta ADC product line, designed specifically for low-power, high-accuracy sensor signal conditioning in harsh industrial environments - emphasizing DC accuracy, noise immunity, and calibration flexibility.

FAQ

What is the maximum sampling rate of the MAX1415EPE+?

The MAX1415EPE+ does not specify a fixed "sampling rate" but defines output data rate (ODR) based on internal clock and filter settings. With fCLKIN = 2.4576 MHz and CLKDIV = 0, the fastest ODR is 500 Hz (for gain = 1–4, unbuffered mode). At lower ODRs like 60 Hz, it achieves <1.3 µV RMS noise and 16-bit peak-to-peak resolution - ideal for precision DC measurements.

Does the MAX1415EPE+ support both unbuffered and buffered analog input modes?

Yes, the MAX1415EPE+ supports both modes via internal switches S1 and S2. In buffered mode (S1/S2 open), input impedance exceeds 1 GΩ, enabling direct connection to high-impedance sensors. In unbuffered mode (S1/S2 closed), the PGA connects directly to AIN pins - reducing noise and power but requiring matched source impedance for optimal CMR.

Can the MAX1415EPE+ operate with an external reference voltage?

Yes, the MAX1415EPE+ accepts an external differential reference voltage applied to REF+ and REF− pins. The specified REF differential input range is 1.00 V to 1.75 V. Using an external reference enables ratiometric measurements and improves system-level accuracy when paired with a precision voltage reference such as the MAX6126.

What is the purpose of the S1 and S2 pins on the MAX1415EPE+?

S1 and S2 are internal switch control terminals that configure the input stage between buffered and unbuffered operation. When left unconnected (open), they enable the on-chip input buffer - providing high input impedance (>1 GΩ) and improved common-mode rejection. When shorted to GND (closed), they bypass the buffer for lower noise and power - suitable for low-impedance sources like Wheatstone bridges.

Is the MAX1415EPE+ pin-compatible with the AD7705?

Yes, the MAX1415EPE+ is explicitly designed as a pin-compatible upgrade to the AD7705 and MX7705. It shares identical pinout, package (16-pin PDIP/SO/TSSOP), and serial interface protocol - allowing drop-in replacement in existing AD7705 designs while adding internal oscillator, improved INL (±0.0015% vs. ±0.003%), and lower power consumption.