Texas Instruments ADS1252UG4

Overview

ADS1252UG4 from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter (ADC) with no missing codes, 19-bit effective resolution at up to 40kHz data rate, and 2.5ppm rms noise. It operates from a single +5V supply, features differential inputs, external reference support (0.5V–5V), and is designed for high-precision measurement in cardiac diagnostics and industrial process control.

For engineers reviewing the ADS1252UG4 datasheet, ADS1252UG4 pinout, ADS1252UG4 application, or ADS1252UG4 equivalent, this page delivers verified technical context, SO-8 package mapping, real-world timing behavior, and validated alternative options for precision measurement systems requiring stable 24-bit conversion at ≤40kHz.

Technical Context

The ADS1252UG4 employs a 4th-order delta-sigma modulator with fixed 64× oversampling and a sinc5 digital filter that fully settles in 1920 system clock cycles. Its modulator clock is derived by dividing the input CLK by 6 - e.g., 16MHz CLK yields 2.667MHz modulator clock and 41.667kHz data rate.

It supports synchronous serial communication via DOUT/DRDY and SCLK pins, with DRDY indicating data readiness and DOUT shifting out 24-bit offset binary two's complement data MSB-first. Power-down and synchronization modes are triggered by holding SCLK HIGH for ≥20 or 4–20 DRDY cycles respectively.

Key Specifications

Pinout & Package

ADS1252UG4 is housed in an SO-8 surface-mount package (package code: D), with 1.27mm pitch, 4.9mm × 3.9mm body, and specified operating temperature range of –40°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution delta-sigma ADC applications.

Compared with ADS1252UG4, ADS1256IPW offers channel density and on-chip signal conditioning at the cost of reduced maximum throughput and larger footprint, while AD7730BRUZ trades speed and flexibility for integrated analog front-end simplicity in static-bridge applications.

Availability

ADS1252UG4 is available at Aetrix Electronics and suitable for cardiac diagnostics, chromatography systems, and precision process control requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for ADS1252UG4 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade signal chain solutions.

The ADS1252UG4 belongs to TI's high-accuracy delta-sigma ADC product line, engineered specifically for applications demanding 24-bit integrity, low drift, and programmable digital filtering in medical, analytical, and process instrumentation.

FAQ

What is the maximum data rate supported by the ADS1252UG4?

The ADS1252UG4 achieves a maximum data rate of 41.667 kHz when driven by a 16 MHz system clock. This value is derived from its fixed 64× oversampling ratio and sinc5 filter architecture. At this rate, it maintains 19-bit effective resolution and 2.5 ppm rms noise. Lower CLK frequencies scale the data rate linearly - e.g., 15.36 MHz CLK yields exactly 40 kHz - enabling precise line-frequency rejection tuning.

Does the ADS1252UG4 require an external voltage reference?

Yes, the ADS1252UG4 requires an external voltage reference connected to the VREF pin. It accepts reference voltages from 0.5 V to 5 V, drawing 220 µA at 16 MHz CLK. A buffered reference (e.g., REF3140 with OPA350) is strongly recommended to preserve INL and noise performance, as unbuffered references may degrade effective resolution due to dynamic loading.

How does the ADS1252UG4 handle synchronization across multiple devices?

The ADS1252UG4 supports hardware synchronization by holding the SCLK pin HIGH for 4–20 consecutive DOUT/DRDY cycles. This forces all synchronized devices into modulator reset, releasing them simultaneously on the falling edge of SCLK. Valid data appears on the sixth DRDY pulse after release, ensuring deterministic phase alignment for multi-channel acquisition without external logic.

What package type is used for the ADS1252UG4?

The ADS1252UG4 is packaged in an SO-8 (Small Outline) surface-mount package with 1.27 mm lead pitch, designated as package code 'D' by Texas Instruments. It measures 4.9 mm × 3.9 mm with a maximum height of 1.75 mm and is rated for operation from –40°C to +85°C. The 'G4' suffix denotes tape-and-reel packaging per TI's ordering conventions.

Can the ADS1252UG4 interface directly with thermocouples?

Yes, the ADS1252UG4 can interface directly with thermocouples using its differential input architecture and programmable sinc5 filter. When combined with a simple op-amp level-shifting circuit (e.g., OPA2350), it supports bipolar input ranges like ±2.5 V or ±5 V referenced to ground. Its 100 dB CMRR and 50/60 Hz notch capability eliminate need for external isolation or active filtering in harsh industrial environments.