Analog Devices Inc./Maxim Integrated MAX1452ATG+T

Overview

MAX1452ATG+T from Maxim Integrated is a precision analog sensor signal conditioner IC designed for resistive bridge sensors in industrial process control and automotive applications. 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, enabling true interchangeability of pressure sensors and strain gauges.

For engineers reviewing the MAX1452ATG+T datasheet, MAX1452ATG+T pinout, MAX1452ATG+T application, or MAX1452ATG+T equivalent, key selection considerations include its -40°C to +125°C operating range, 24-pin TQFN-EP package with exposed pad, 2mA supply current for 4–20mA loop-powered designs, ratiometric output support (+0.5V to +4.5V), and Secure-Lock™ EEPROM protection for calibrated coefficients.

Technical Context

The MAX1452ATG+T implements a hybrid analog-digital architecture: sensor excitation and amplification are fully analog, while trimming uses digitally controlled 16-bit DACs for offset, span, offset TC, and FSOTC. Its 8-bit temperature ADC indexes 176-entry EEPROM lookup tables every 1ms to deliver temperature-compensated outputs with ~1.5°C resolution across -40°C to +125°C.

It supports both voltage and current bridge excitation, accommodates sensor sensitivities from 4mV/V to 60mV/V, and provides fast 150μs step response. The uncommitted op amp enables external 4–20mA current-loop drive or filtering without additional components, and the single-pin DIO interface allows calibration and output sensing on one line via parallel OUT/DIO connection.

Key Specifications

Pinout & Package

MAX1452ATG+T is housed in a 24-pin TQFN-EP package (4mm × 4mm, 0.5mm pitch) with exposed thermal pad (internally connected to VSS). The package supports high-density PCB layouts and efficient heat dissipation in thermally constrained modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8553ACPZ-REEL7 and PGA460TPWR, the MAX1452ATG+T uniquely combines full analog signal conditioning, on-chip temperature-aware DACs, 176-point EEPROM lookup tables, and Secure-Lock in a single chip - eliminating host MCU dependency and reducing BOM count by ≥4 components in bridge-based sensor modules.

Availability

MAX1452ATG+T is available at Aetrix Electronics and suitable for automotive pressure sensing, industrial 4–20mA transmitters, and aerospace-grade strain gauge instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1452ATG+T 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, automotive, and communications markets.

The MAX1452 product line was designed specifically to replace multi-component discrete signal chains in resistive bridge sensor systems - delivering factory-calibrated, temperature-compensated analog outputs with minimal external components and zero software overhead.

FAQ

What is the operating temperature range of the MAX1452ATG+T?

The MAX1452ATG+T is rated for -40°C to +125°C operation, making it suitable for under-hood automotive applications and industrial environments with extreme thermal cycling. This rating is validated per the device's qualification testing and applies to all electrical specifications unless otherwise noted in the datasheet. The on-chip temperature sensor and EEPROM are characterized across this full range to ensure accurate compensation and reliable data retention.

Does the MAX1452ATG+T support both voltage and current excitation for bridge sensors?

Yes, the MAX1452ATG+T supports both modes: current excitation via the ISRC and BDR pins (configurable 0.1–2mA), and voltage excitation through programmable bridge drive. The internal current source is optimized for silicon piezoresistive sensors, and external resistors (RISRC/RSTC) can be added for custom bridge types. This dual-mode flexibility allows the MAX1452ATG+T to interface directly with a broad range of commercial and custom resistive sensors without external drivers.

How does the Secure-Lock™ feature protect calibration data in the MAX1452ATG+T?

The Secure-Lock™ feature in the MAX1452ATG+T prevents unauthorized modification of stored calibration coefficients and user EEPROM data after final calibration. When enabled (CL[7:0] = 0xFF), writes to internal registers and EEPROM are blocked unless the UNLOCK pin is asserted high. This hardware-enforced lock ensures coefficient integrity in field-deployed sensors and enables secure factory recalibration during rework - a capability confirmed in Maxim's official application notes and datasheet revision history for the MAX1452ATG+T.

Can the MAX1452ATG+T generate a 4–20mA output without external active components?

Yes, the MAX1452ATG+T can generate a full 4–20mA output using only its integrated uncommitted op amp (AMP+, AMP−, AMPOUT) and passive components like resistors and a transistor. Reference schematics in the MAX1452ATG+T datasheet (Figure 4) show a complete loop-powered 4–20mA transmitter with no external op amps or DACs required. The 2.5mA supply current budget leaves sufficient headroom for the output stage while maintaining compliance with 2-wire loop constraints.

What is the resolution and accuracy of temperature compensation in the MAX1452ATG+T?

The MAX1452ATG+T achieves temperature compensation resolution of ~1.5°C using its on-chip 8-bit temperature ADC, which indexes 176 entries in the EEPROM lookup tables for offset and FSO correction. Each DAC step provides 76µV (VDD-referenced) or 38µV (bridge-referenced) resolution. Combined with first-order offset TC and FSOTC DACs, this enables <0.25% total error over -40°C to +125°C - a performance level verified in Maxim's characterization reports and application examples for the MAX1452ATG+T.