Semtech Corporation SX8724E082TDT

Overview

SX8724E082TDT from Semtech is a low-power, 16-bit ZoomingADC™ analog front-end IC designed for high-precision pressure and temperature sensor interfacing. It features 3 differential (or 6 single-ended) inputs, programmable gain up to 1000 V/V, internal 1.22 V bandgap reference, and 2-wire (I²C-compatible) digital interface - enabling direct connection to microcontrollers in industrial sensing systems.

For engineers reviewing the SX8724E082TDT datasheet, pinout, applications, or equivalent options, this device delivers configurable resolution–speed–power trade-offs, on-chip sensor biasing via four GPIOs, and validated performance across –40°C to +125°C for barometric, compass, and industrial transducer signal chains.

Technical Context

The SX8724E082TDT implements a multi-stage acquisition chain: three cascaded programmable gain amplifiers (PGA1–PGA3) feed a sigma-delta ZoomingADC with oversampling ratios from 8 to 1024. Its resolution is dynamically set via OSR and NELCONV registers, supporting 6–16-bit output with no missing codes at full scale.

It integrates an internal RC oscillator (4 MHz), charge pump (VPUMP) for sub-3V operation, and GPIO-controlled sensor excitation/reset - all managed through a 2-wire interface with up to 400 kHz clock rate and READY interrupt signaling end-of-conversion.

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 analog front-end applications.

Compared with ADS114S08BIPWR and MAX11206ETL+, the SX8724E082TDT uniquely integrates sensor excitation, multi-stage offset/gain tuning, and low-voltage boost capability - making it optimal for compact, multi-sensor industrial modules where BOM count and layout space are constrained.

Availability

SX8724E082TDT is available at Aetrix Electronics and suitable for industrial pressure sensing, barometric altitude measurement, and electronic compass calibration requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SX8724E082TDT 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 SX8724E082TDT belongs to Semtech's ZoomingADC™ family - engineered specifically for low-power, high-accuracy sensor signal conditioning in harsh industrial environments where precision, integration, and thermal robustness are critical.

FAQ

What is the maximum differential input voltage range supported by the SX8724E082TDT at 16-bit resolution?

The SX8724E082TDT supports a differential input voltage range of ±2.42 mV at gain = 1000 and OSR = 32, which corresponds to its full-scale range for high-gain, high-resolution pressure sensing. At gain = 1 and OSR = 32, the range expands to ±2.42 V - allowing flexible use across sensor types without external signal conditioning. This range is defined by the internal 1.22 V reference and oversampling configuration.

Does the SX8724E082TDT require an external crystal or clock source?

No, the SX8724E082TDT includes an internal 4 MHz RC oscillator that serves as the time base for the ZoomingADC™ and digital logic. No external crystal or clock source is required for basic operation. The internal oscillator is sufficient for all specified timing characteristics including 2-wire communication and conversion timing, though external references may be used for higher precision timing if needed.

How does the VPUMP pin function in the SX8724E082TDT, and when must it be used?

The VPUMP pin on the SX8724E082TDT outputs a boosted voltage generated by an on-chip charge pump, ensuring analog switch and amplifier operation remains stable when VBATT falls below 3 V. It must be used with a 1–10 nF capacitor to ground whenever the supply voltage is expected to dip below 3 V - such as in battery-powered barometers or portable industrial sensors - to prevent gain error or conversion failure due to insufficient analog rail headroom.

Can the SX8724E082TDT interface with an external voltage reference, and how is it configured?

Yes, the SX8724E082TDT supports external reference operation via D0 (REFOUT) and D1 (REFIN) pins. When VREF_D0_OUT and VREF_D1_IN bits in RegMode are set to 1, D0 becomes a high-impedance reference output and D1 accepts an external reference input (up to VBATT). This bypasses the internal bandgap and allows use of higher-precision or temperature-stable external references for metrology-grade applications.

What is the purpose of the READY pin on the SX8724E082TDT, and how is it timed?

The READY pin on the SX8724E082TDT is an open-drain digital output that asserts a low-going pulse upon completion of each ADC conversion. Its duration equals exactly one cycle of the ADC sampling frequency (1/fS), providing precise hardware synchronization for MCU firmware to initiate data reads without polling or fixed delays. This eliminates timing uncertainty in real-time sensor systems and reduces CPU overhead during continuous acquisition.