Texas Instruments ADS1245IDGST

Overview

ADS1245IDGST from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter (ADC) with 3 GΩ buffered input impedance, ±2.5 V differential input range, and 15 SPS output rate at 2.4576 MHz clock. It delivers 0.0015% max INL, 100 dB CMRR at 50/60 Hz, and operates from 2.5–5.25 V analog and 1.8–3.6 V digital supplies - ideal for precision handheld medical sensors and portable instrumentation.

For engineers reviewing the ADS1245IDGST datasheet, ADS1245IDGST pinout, ADS1245IDGST application, or ADS1245IDGST equivalent, key selection considerations include its single-cycle settling time, simultaneous 50/60 Hz rejection, Sleep mode power <1 µW, two-wire serial interface timing, and MSOP-10 package compatibility with ADS1244 designs.

Technical Context

The ADS1245IDGST employs a third-order delta-sigma modulator with internal chopper-stabilized buffering to achieve 3 GΩ effective input impedance and low-drift performance across −40°C to +85°C. Its digital filter provides fixed 15 SPS output, single-conversion settling, and notch rejection precisely at 50 Hz and 60 Hz when driven by a 2.4576 MHz system clock.

It uses a two-wire serial interface where DRDY/DOUT serves dual functions: asserting low to signal valid data, then shifting out 24-bit two's complement codes on rising SCLK edges. Self-calibration is initiated via timed SCLK pulses and completes in ~210 ms, with inputs internally disconnected during calibration.

Key Specifications

Pinout & Package

ADS1245IDGST is housed in a 10-pin MSOP (DGS) package measuring 3.0 mm × 3.0 mm × 1.0 mm, optimized for space-constrained portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1244IDGST, ADS1245IDGST adds critical 3 GΩ buffering and dual-frequency rejection for high-Z sensor front-ends; compared with AD7190BRUZ, it trades speed and PSRR for 30% lower power and compact MSOP-10 footprint - making it optimal for space- and battery-limited precision measurement.

Availability

ADS1245IDGST is available at Aetrix Electronics and suitable for hand-held instrumentation, portable medical equipment, and industrial process control requiring stable component supply across extended product lifecycles.

Supply support for ADS1245IDGST 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 acquisition ICs.

The ADS1245IDGST belongs to TI's high-resolution delta-sigma ADC product line, engineered specifically for low-power, high-accuracy measurement in portable and space-constrained systems.

FAQ

What is the maximum clock frequency supported by ADS1245IDGST?

The ADS1245IDGST supports a CLK input up to 6 MHz per absolute maximum ratings. However, the recommended frequency is 2.4576 MHz to maintain 15 SPS output rate and precise 50/60 Hz rejection. At higher frequencies, data rate scales linearly but notch frequencies shift proportionally - e.g., 4.9152 MHz yields 30 SPS with 100/120 Hz rejection.

Does ADS1245IDGST require external calibration components?

No, ADS1245IDGST performs full self-calibration internally - including offset and gain correction - triggered either automatically at power-up or manually via SCLK pulses. No external resistors, capacitors, or reference sources are needed for calibration, simplifying layout and reducing BOM count.

Can ADS1245IDGST operate from a single 3.3 V supply?

Yes, ADS1245IDGST supports single-supply operation: connect AVDD and DVDD together to 3.3 V. The analog section operates down to 2.5 V and digital section up to 3.6 V, so 3.3 V satisfies both rails. Ensure DRDY/DOUT logic levels remain compatible with the host MCU's input thresholds.

How does ADS1245IDGST handle input overvoltage conditions?

ADS1245IDGST includes ESD protection diodes on all pins. To prevent conduction, analog inputs (AINP/AINN/VREFP/VREFN) must stay within GND − 0.1 V to AVDD + 0.1 V. Exceeding these limits risks damage or degraded INL; the absolute input range specification (GND + 0.1 V to AVDD − 1.25 V) defines the linear operating window.

Is ADS1245IDGST pin-compatible with any other TI ADCs?

Yes, ADS1245IDGST is explicitly pin-compatible with ADS1244IDGST in the MSOP-10 (DGS) package. This allows direct drop-in replacement in existing ADS1244 designs to upgrade input impedance from 1 GΩ to 3 GΩ and add simultaneous 50/60 Hz rejection without PCB changes.