Semtech Corporation SX8725E083TRT

Overview

SX8725E083TRT from Semtech is a low-power, 16-bit ZoomingADC™ analog-to-digital converter optimized for miniature pressure and temperature sensors. It features one differential analog input (AC2/AC3), two programmable digital I/Os (D0/D1) for sensor biasing or reference handling, and a 2-wire (I²C-compatible) interface operating up to 400 kHz. Its programmable gain (1/12 to 1000), internal 1.22 V bandgap reference, and 250 µA active current at 16-bit/500 S/s enable high-precision sensing in battery-powered industrial transducers.

For engineers reviewing the SX8725E083TRT datasheet, pinout, applications, or equivalent options, this device supports differential sensor interfacing with on-chip PGA offset compensation, selectable power reduction modes, and integrated charge pump for sub-3V operation - critical for compact, low-voltage sensor nodes requiring stable resolution and minimal quiescent current.

Technical Context

The SX8725E083TRT implements a multi-stage programmable gain amplifier (PGA1–PGA3) feeding a sigma-delta ZoomingADC™ core with oversampling ratios from 8 to 1024. Its acquisition chain supports continuous-time or on-request conversion, with resolution dynamically configurable from 6 to 16 bits via OSR and NELCONV register settings.

It integrates an internal RC oscillator (4 MHz), charge pump (VPUMP) for analog switch supply regulation, and GPIO-controlled reference routing (D0 as VREFOUT, D1 as VREFIN). The READY pin provides synchronous end-of-conversion signaling, and all digital I/Os comply with standard 2-wire timing (tSU;DAT ≥ 100 ns, fSCL ≤ 400 kHz).

Key Specifications

Pinout & Package

Package: MLPD-W-12 (4 mm × 4 mm, wettable flank, 0.5 mm pitch, 12-pin leadless package with exposed thermal pad).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution, low-power sensor ADC applications.

Compared with ADS1115IDGSR and MAX11200EEE+, the SX8725E083TRT uniquely integrates sensor biasing (D0/D1), charge-pump–assisted low-voltage operation, and on-chip offset compensation - reducing BOM count and enabling direct connection to unconditioned bridge sensors without external op-amps or references.

Availability

SX8725E083TRT is available at Aetrix Electronics and suitable for industrial pressure transducers, barometric altitude modules, and automotive cabin temperature sensors requiring stable component supply, RoHS-compliant packaging, and long-lifecycle availability.

Supply support for SX8725E083TRT 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, connectivity, and power management.

The SX8725E083TRT belongs to Semtech's ZoomingADC™ family, designed specifically for ultra-low-power, high-accuracy data acquisition from miniature resistive and capacitive sensors in harsh industrial and automotive environments.

FAQ

What is the maximum differential input voltage range supported by the SX8725E083TRT at full gain?

The SX8725E083TRT supports a maximum differential input voltage range of ±2.42 mV when configured with PGA total gain = 1000 and OSR = 32. This range is derived from the internal 1.22 V reference and oversampling ratio, enabling high-sensitivity capture from low-output bridge sensors without external amplification. The SX8725E083TRT maintains this specification across its full operating temperature range (−40 °C to +125 °C) with guaranteed INL ≤ ±1.5 LSB.

Does the SX8725E083TRT require an external crystal or oscillator?

No, the SX8725E083TRT includes an internal 4 MHz RC oscillator that serves as the time base for the ZoomingADC™ core and digital logic. This eliminates the need for external timing components and reduces system BOM count. The oscillator is factory-trimmed and stable enough to support 16-bit conversions without external calibration; however, for applications demanding tighter timing accuracy, the SX8725E083TRT does not support external clock injection.

Can the SX8725E083TRT operate from a 2.4 V supply while maintaining full 16-bit performance?

Yes, the SX8725E083TRT operates from 2.4 V to 5.5 V and maintains full 16-bit functionality at 2.4 V, but only when the internal charge pump (VPUMP) is enabled to sustain analog switch supply ≥3 V. At VBATT < 3 V, the charge pump automatically activates (unless disabled via MULT_FORCE_OFF), ensuring consistent PGA and ADC performance. The SX8725E083TRT's 250 µA active current at 16-bit/500 S/s is specified down to 2.4 V with VPUMP active.

How is sensor offset compensated in the SX8725E083TRT?

Sensor offset is compensated using programmable digital offsets applied to PGA2 and PGA3 stages, with steps of 0.2 V/V (PGA2) and 1/12 V/V (PGA3), allowing up to ±1 V/V and ±5.25 V/V adjustment respectively. These offsets are written to dedicated registers (RegACCfg3–RegACCfg5) and applied in the analog domain before ADC conversion. The SX8725E083TRT supports up to 15× full-scale input signal offset correction, making it suitable for thermistor or strain gauge sensors with large initial offsets.

What are the key layout recommendations for the SX8725E083TRT's MLPD-W-12 package?

Key layout requirements for the SX8725E083TRT include: (1) soldering Pin 13 (exposed thermal pad) directly to a solid PCB ground plane for thermal dissipation and noise reduction; (2) placing 1–10 nF ceramic capacitor between VPUMP and VSS close to the package; (3) routing AC2/AC3 differentially with matched length and guard traces; (4) separating analog (VBATT, VSS, AC2/AC3) and digital (SDA, SCL, READY) traces; and (5) using separate ground vias for analog and digital sections tied at a single point near the IC. These practices ensure specified INL, noise, and PSRR performance.