Analog Devices Inc./Maxim Integrated MAX1457CCJ

Overview

MAX1457CCJ from Maxim Integrated is a 32-pin TQFP analog sensor signal processor optimized for piezoresistive sensor calibration and compensation. It integrates a 3-bit programmable-gain amplifier (54–306 V/V), 12-bit ADC, five 16-bit DACs, programmable current source (0.1–2.0 mA), and uncommitted op amp. It achieves ±0.1% total error relative to sensor repeatability in pressure transducer modules operating from 0°C to +70°C.

For engineers reviewing the MAX1457CCJ datasheet, MAX1457CCJ pinout, MAX1457CCJ application, or MAX1457CCJ equivalent, this device supports multislope temperature compensation across up to 120 segments, ratiometric 5V output, and SPI/MicroWire EEPROM interfacing for production-grade sensor calibration systems.

Technical Context

The MAX1457CCJ implements closed-loop analog signal conditioning using a switched-capacitor PGA with input-referred offset trimming (±100 mV) and 16-bit DAC-controlled gain/offset/temperature coefficients. Its 12-bit ADC digitizes bridge voltage (BDRIVE) to select one of up to 120 EEPROM-stored correction pairs for OFFSET TC and FSO TC DACs.

Compensation occurs via dual-path analog injection: DC offset correction through OFSTDAC summing at PGA output, and full-span adjustment via FSODAC-modulated bridge current. Second-order nonlinearity is corrected by resistive feedback from LINOUT to ISRC using the 16-bit FSO LIN DAC.

Key Specifications

Pinout & Package

MAX1457CCJ is housed in a 32-lead TQFP package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Maxim's 19-1342 Rev 1 datasheet (1998) and match the TQFP pin configuration diagram on page 11.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1457CWI, the MAX1457CCJ provides superior thermal management in high-density layouts and supports more robust automated test connectivity via its full 32-pin TQFP layout; versus ASIC1024, it delivers programmable multislope compensation and vendor-agnostic EEPROM-based calibration essential for multi-sensor manufacturing lines.

Availability

MAX1457CCJ is available at Aetrix Electronics and suitable for pressure transducer calibration, industrial process monitoring, automotive fuel rail sensing, and medical disposable pressure sensors requiring stable component supply across extended production lifecycles.

Supply support for MAX1457CCJ 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 precision analog, mixed-signal, and high-reliability ICs for industrial, automotive, and medical applications.

The MAX1457 product line was designed specifically for automated, high-volume calibration of piezoresistive sensors - integrating pretest data acquisition, coefficient computation, and final verification into a single IC to reduce test cost and improve yield.

FAQ

What is the maximum number of temperature segments supported by the MAX1457CCJ for multislope compensation?

The MAX1457CCJ supports up to 120 temperature segments for multislope compensation. This is achieved by using its 12-bit ADC to measure the bridge voltage (BDRIVE) and selecting corresponding OFFSET TC and FSO TC coefficients stored in external EEPROM. Each segment provides ±0.2 mV (±0.005% FSO) resolution, enabling sub-0.1% FSO residual error after full calibration. The MAX1457CCJ's segmentation capability is fixed in silicon and does not depend on EEPROM size beyond the minimum 4096-bit requirement.

Does the MAX1457CCJ require an external EEPROM, and if so, which part is recommended?

Yes, the MAX1457CCJ requires an external EEPROM to store calibration coefficients - specifically the 93C66 (4096-bit, Microwire-compatible) as confirmed in the datasheet Figure 5 and Applications Information section. The MAX1457CCJ interfaces directly via ECS/ECLK/EDI/EDO pins with no level-shifting needed. While other 93-series EEPROMs may function, the 93C66 is the only device validated for timing, fan-out, and voltage compatibility with the MAX1457CCJ's serial interface.

Can the MAX1457CCJ be used with sensors other than piezoresistive types?

Yes, the MAX1457CCJ can condition other resistive sensors including accelerometers and strain gauges, provided external components are added to adapt their output format. The datasheet explicitly states this capability in the General Description section and notes that "a few external components" - such as bridge completion resistors or gain-setting networks - are required. However, full temperature compensation features (e.g., multislope FSO TC) were optimized for piezoresistive behavior and may require empirical validation for non-piezoresistive elements.

What is the purpose of the NBIAS pin on the MAX1457CCJ, and how must it be configured?

The NBIAS pin on the MAX1457CCJ sets the internal bias current for the oscillator and analog circuitry. It must be connected to VDD through a 400 kΩ resistor (RBIAS) and bypassed to VSS with a 0.1 µF capacitor, as specified in the Pin Description table and Figure 5. This configuration establishes the 100 kHz internal clock frequency and ensures stable operation of the PGA and DACs. Omitting RBIAS or using incorrect resistance values causes gain inaccuracy and timing errors in EEPROM communication.

How does the MAX1457CCJ achieve rail-to-rail analog output despite using a 5V supply?

The MAX1457CCJ achieves rail-to-rail output through its internal PGA architecture and output buffer design, allowing VOUT to swing from (VSS + 0.25 V) to (VDD – 0.25 V) under 5 kΩ load conditions. This 0.25 V headroom is maintained across temperature and process variation, enabling true ratiometric operation where output scale tracks VDD precisely. The specification is verified in the Electrical Characteristics table (page 2) and applies directly to the MAX1457CCJ's 32-pin TQFP variant.