Analog Devices Inc./Maxim Integrated MAX1452CAE+TC8H

Overview

The MAX1452CAE+TC8H from Maxim Integrated is a precision analog sensor signal conditioner IC designed for resistive bridge sensors in industrial process control. It integrates a 16-step PGA (39–234 V/V), four 16-bit DACs, 768-byte EEPROM, on-chip temperature sensor, and uncommitted op amp. It delivers ±0.02% span calibration accuracy with fully analog signal path-no quantization noise-and supports 4–20mA, 0–5V, and ratiometric outputs in pressure transducers and strain gauge systems.

For engineers reviewing the MAX1452CAE+TC8H datasheet, MAX1452CAE+TC8H pinout, MAX1452CAE+TC8H application, or MAX1452CAE+TC8H equivalent, key selection criteria include its 16-pin SSOP package, 0°C to +70°C operating range, 2.0–2.5 mA supply current, 150 µs step response, and dual-mode bridge excitation (current/voltage) for high-accuracy sensor compensation.

Technical Context

The MAX1452CAE+TC8H implements a hybrid analog-digital architecture: sensor signals pass through a switched-capacitor PGA before digitally controlled trimming via four independent 16-bit DACs-two for offset/FSO calibration and two for first-order temperature compensation (Offset TC, FSOTC). Its internal 8-bit temperature ADC indexes 176-entry EEPROM lookup tables at ~1.5°C resolution for nonlinear correction.

Calibration coefficients are stored in 768-byte EEPROM organized across 12 pages, including dedicated 16-bit-wide tables for ODAC (offset) and FSODAC (full-span output), plus 52 bytes of user-programmable space. Secure-Lock™ prevents post-calibration EEPROM modification unless UNLOCK is asserted, enabling factory rework.

Key Specifications

Pinout & Package

MAX1452CAE+TC8H is housed in a 16-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, RoHS-compliant and lead-free. The exposed pad is absent in this variant (present only in TQFN-EP packages).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog sensor signal conditioning applications.

Compared with MAX1455EEE+, the MAX1452CAE+TC8H offers lower system BOM cost and smaller footprint in commercial-grade applications but lacks SPI and extended temperature support. Against AD8553ARZ, it delivers complete autonomous calibration and temperature compensation without host processor dependency - critical for sealed or remote sensor modules.

Availability

MAX1452CAE+TC8H is available at Aetrix Electronics and suitable for pressure transmitters, strain gauge load cells, humidity sensors, and accelerometers requiring stable component supply in commercial-temperature industrial instrumentation.

Supply support for MAX1452CAE+TC8H 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, communications, and computing markets.

The MAX1452CAE+TC8H belongs to Maxim's precision sensor signal conditioner product line, engineered to replace discrete op amp, DAC, and EEPROM combinations in resistive bridge sensor modules - reducing design time and PCB area while guaranteeing calibrated performance.

FAQ

What is the operating temperature range of the MAX1452CAE+TC8H?

The MAX1452CAE+TC8H is rated for 0°C to +70°C operation - the 'C' grade designation in its part number confirms its commercial temperature range. This makes it ideal for indoor industrial instrumentation, laboratory equipment, and consumer-grade sensor modules where ambient conditions remain within this band. The device's internal temperature sensor and EEPROM-based compensation tables are fully functional across this range, ensuring consistent calibration performance without derating.

Does the MAX1452CAE+TC8H support both current and voltage bridge excitation?

Yes, the MAX1452CAE+TC8H supports both modes via the ISRC pin and internal configuration. When ISRC is grounded, the device operates in current-source excitation mode (typical IBDR = 0.1–2 mA); when ISRC is left open or pulled high, it switches to voltage-source excitation using internal resistors. This flexibility allows optimization for different sensor types - e.g., constant-current drive for piezoresistive elements or ratiometric voltage drive for strain gauges - without external component changes.

How does the Secure-Lock™ feature work on the MAX1452CAE+TC8H?

Secure-Lock™ on the MAX1452CAE+TC8H prevents unauthorized modification of calibration coefficients stored in EEPROM. Once enabled (by writing 0xFF to the Secure-Lock byte), all EEPROM writes are blocked unless the UNLOCK pin is driven logic-high. This ensures field reliability of calibrated sensors while permitting factory recalibration or rework. The feature is hardware-enforced and independent of software commands - making it robust against firmware errors or malicious access.

Can the MAX1452CAE+TC8H generate a 4–20mA output directly?

Yes, the MAX1452CAE+TC8H can generate a true 4–20mA loop-powered output using its integrated uncommitted op amp (AMP+, AMP−, AMPOUT) in conjunction with external transistors and resistors - as shown in Figure 4 of the datasheet. Its low 2.0–2.5 mA quiescent current allows full operation from the loop itself, eliminating the need for auxiliary power supplies. No additional DAC or current-sense amplifier is required.

What is the purpose of the FSOTC pin on the MAX1452CAE+TC8H?

The FSOTC (Full-Span Output Temperature Compensation) pin on the MAX1452CAE+TC8H provides a buffered output of the FSOTC DAC, which generates a temperature-dependent correction voltage referenced to the bridge drive voltage (VBDR ≈ +2.5V). This signal drives external resistors (RISRC and RSTC) to modulate bridge excitation in proportion to temperature - compensating for sensor TCR-induced gain drift. It enables first-order FSO correction without consuming PGA or output headroom.