Analog Devices Inc./Maxim Integrated MAX675CPA+

Overview

MAX675CPA+ from Maxim Integrated is a pretrimmed +5V precision voltage reference IC with ±0.15% initial accuracy, 12ppm/°C temperature coefficient, and 10µV_P-P low-frequency noise (0.1Hz–10Hz), designed for high-accuracy analog signal conditioning in data acquisition systems.

For engineers reviewing the MAX675CPA+ datasheet, MAX675CPA+ pinout, MAX675CPA+ application, or MAX675CPA+ equivalent, key selection criteria include output stability over temperature, trim-adjustable range (±150mV), load regulation (0.001%/mA), and compatibility with A/D and D/A converter reference inputs requiring low drift and low noise.

Technical Context

The MAX675CPA+ uses a bandgap-based reference core with on-chip trimming to achieve ±7mV (±0.15%) initial output tolerance at +25°C. Its TEMP pin provides a proportional-to-absolute-temperature (PTAT) voltage output (≈2.1mV/°C) independent of the main reference path.

It features short-circuit protection, operates from 15V input, delivers up to 10mA load current at +25°C, and maintains stable performance across 0°C to +70°C ambient - validated per the C-grade ordering specification.

Key Specifications

Pinout & Package

MAX675CPA+ is supplied in an 8-pin plastic DIP (PDIP) package with 0.3-inch width and through-hole mounting. Pin functions are electrically validated per Maxim's official MAX675 datasheet (Rev 2, 7/04).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Compared with REF02CP and MAX6126AASA50, the MAX675CPA+ uniquely balances moderate cost, integrated temperature sensing, and sufficient precision for 16-bit data converters - making it optimal for space-constrained industrial instruments where dual functionality reduces component count.

Availability

MAX675CPA+ is available at Aetrix Electronics and suitable for digital voltmeters, A/D converters, D/A converters, and precision calibration standards requiring stable component supply across industrial and test equipment programs.

Supply support for MAX675CPA+ 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) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.

The MAX675CPA+ belongs to Maxim's precision voltage reference product line, engineered specifically for applications demanding low-drift, low-noise, and multi-function integration - such as portable test gear and sensor signal chains where board area and calibration complexity must be minimized.

FAQ

What is the operating temperature range for the MAX675CPA+?

The MAX675CPA+ is rated for operation from 0°C to +70°C, as confirmed by Maxim's official ordering information table. This commercial-grade temperature range aligns with its "C" suffix designation and is validated for all electrical specifications in that interval. The device remains functional outside this range but does not guarantee parameter compliance beyond the stated limits. For extended temperature operation, consider the MAX675EPA+ (–40°C to +85°C).

Does the MAX675CPA+ require external capacitors for stability?

Yes, the MAX675CPA+ requires a minimum 1µF low-ESR ceramic capacitor between VOUT and GND to suppress high-frequency noise and ensure loop stability. The datasheet specifies this for both noise reduction and transient response; omitting it may increase output ripple and degrade settling time. No capacitor is required on the TRIM or TEMP pins, but those nodes must avoid stray capacitance exceeding 30pF.

Can the MAX675CPA+ drive a 10mA load continuously?

The MAX675CPA+ can deliver up to 10mA load current at +25°C, as shown in the "Maximum Load Current vs. Temperature" graph (Figure toc04). However, at the upper end of its 0°C to +70°C operating range, maximum sustainable load decreases to ~7mA due to thermal derating. Continuous 10mA operation is safe only at ambient temperatures ≤+40°C and with adequate PCB copper area for heat dissipation.

How is the TEMP pin used in practical circuits with the MAX675CPA+?

The TEMP pin of the MAX675CPA+ outputs a voltage proportional to absolute temperature (≈2.1mV/°C), e.g., 630mV at +25°C. It is commonly routed to an ADC input for direct temperature readout or fed into an op-amp for offset/gain adjustment in sensor compensation networks. Figure 6 in the datasheet shows a remote transducer implementation using shielded cable - confirming its use in real-world thermal monitoring without additional signal conditioning.

Is the MAX675CPA+ pin-compatible with other MAX675 variants?

Yes, the MAX675CPA+ shares identical pinout and function mapping with all PDIP-packaged MAX675 variants (e.g., MAX675EPA+, MAX675MTV+), including VOUT, TRIM, GND, TEMP, VIN, and three N.C. pins. This allows direct substitution within the same package type. However, SO-package variants (e.g., MAX675CSA+) have different physical pin spacing and cannot be interchanged without PCB redesign.