Semtech Corporation SX8724E082TRT

Overview

SX8724E082TRT from Semtech is a low-power, 16-bit ZoomingADC™ analog front-end IC designed for precision pressure and temperature sensor interfacing in industrial and environmental monitoring systems. It features 3 differential (or 6 single-ended) analog inputs, programmable gain up to 1000 V/V, internal 1.22 V bandgap reference, and a 2-wire (I²C-compatible) digital interface operating up to 400 kHz.

For engineers reviewing the SX8724E082TRT datasheet, pinout, applications, or equivalent options, this device supports high-resolution sensor acquisition with configurable resolution/speed/power trade-offs, on-chip sensor biasing via four GPIOs, and operation across –40°C to +125°C industrial temperature range.

Technical Context

The SX8724E082TRT implements a switched-capacitor ZoomingADC™ architecture with three cascaded programmable gain amplifiers (PGA1–PGA3), enabling adaptive signal conditioning before oversampling conversion. Its acquisition chain supports OSR from 8 to 1024 and NELCONV settings of 1/2/4/8, yielding resolutions from 6 to 16 bits.

It integrates an internal RC oscillator (4 MHz nominal), charge pump (VPUMP) for analog switch drive when VBATT < 3 V, and a 4-bit GPIO block with dual-function pins D0/REFOUT and D1/REFIN for external reference support. All digital I/Os are 5 V tolerant with 8 mA drive capability and configurable input/output direction per pin.

Key Specifications

Pinout & Package

Package: MLPQ-16 (4 mm × 4 mm, 0.5 mm pitch, exposed thermal pad).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution sensor interface applications.

Compared with ADS1220IPWR and MAX11206ETL+, the SX8724E082TRT uniquely integrates sensor excitation, offset compensation, and adaptive resolution in a single 4×4 mm package - reducing system latency, PCB area, and firmware complexity for industrial sensor nodes requiring autonomous operation.

Availability

SX8724E082TRT is available at Aetrix Electronics and suitable for industrial pressure sensing, automotive barometric modules, and MEMS compass calibration systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for SX8724E082TRT 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

Semtech Corporation is a U.S.-based fabless semiconductor company specializing in high-performance analog and mixed-signal ICs for sensing, power management, and RF applications.

The SX8724E082TRT belongs to Semtech's ZoomingADC™ product line, engineered specifically for low-power, high-accuracy sensor signal acquisition in harsh industrial and automotive environments where integration, reliability, and temperature stability are critical.

FAQ

What is the maximum differential input voltage range supported by the SX8724E082TRT at full-scale 16-bit resolution?

The SX8724E082TRT supports a differential input voltage range of ±2.42 mV at gain = 1000 and OSR = 32 - the configuration required for full-scale 16-bit resolution. This range is derived from the internal 1.22 V reference and oversampling ratio, enabling direct interface with low-output piezoresistive pressure sensors without external amplification. The SX8724E082TRT maintains ±1.5 LSB INL within this range across its full operating temperature span.

Does the SX8724E082TRT require an external crystal or oscillator for operation?

No, the SX8724E082TRT includes an internal 4 MHz RC oscillator that serves as the time base for the ZoomingADC™ and digital logic - eliminating the need for external timing components. This oscillator is factory-trimmed and provides sufficient accuracy for sensor acquisition timing; it cannot be overridden by an external clock source. The SX8724E082TRT uses this internal oscillator exclusively for all conversion timing, including oversampling frequency generation and READY pulse duration.

How does the charge pump (VPUMP pin) function in the SX8724E082TRT, and when must it be used?

The VPUMP pin on the SX8724E082TRT drives an external 1–10 nF capacitor to generate a boosted analog supply ≥3 V when VBATT falls below 3 V. This ensures proper switching performance of internal analog multiplexers and PGAs under low-voltage conditions. The charge pump is automatically activated when VBATT < 3 V unless disabled via the MULT_FORCE_OFF bit in RegMode. The SX8724E082TRT will operate correctly with VPUMP unconnected only if VBATT remains ≥3 V at all times.

Can the SX8724E082TRT simultaneously acquire from all three differential input pairs?

No, the SX8724E082TRT uses a single acquisition chain with one shared ZoomingADC™ core and three differential input pairs routed through an analog multiplexer. It performs sequential acquisition - selecting one pair (AC2/AC3, AC4/AC5, or AC6/AC7) per conversion cycle. However, the SX8724E082TRT supports rapid channel switching with programmable stabilization delay (OSR cycles), enabling effective time-division multiplexing across all three sensor inputs at throughput rates up to 1 kS/s total.

What is the purpose of the READY pin on the SX8724E082TRT, and how is it timed?

The READY pin on the SX8724E082TRT is an open-drain digital output that pulses low for exactly one ADC sampling cycle upon conversion completion - serving as a hardware-ready flag for interrupt-driven firmware. Its pulse width equals 1/fS, where fS is the configured oversampling frequency (e.g., 1 µs at 1 MHz). This timing is independent of resolution or PGA configuration and allows the host MCU to initiate data reads without polling or fixed delays. The SX8724E082TRT asserts READY only after full conversion and register update are complete.