Texas Instruments ADS8325IDGKT

Overview

ADS8325IDGKT from Texas Instruments is a 16-bit, SAR analog-to-digital converter with differential input, SPI/SSI-compatible serial interface, and microPower operation (4.5 mW at 100 kSPS, 1 mW at 10 kSPS). It operates from 2.7 V to 5.5 V, supports external reference voltages from 2.5 V to VDD, and delivers ±1.5 LSB typical integral linearity and 3 LSBPP noise-enabling high-precision data acquisition in battery-powered instrumentation and isolated sensor interfaces.

For engineers reviewing the ADS8325IDGKT datasheet, ADS8325IDGKT pinout, ADS8325IDGKT application, or ADS8325IDGKT equivalent, key selection considerations include its MSOP-8 package, 100 kSPS throughput, differential input architecture with –IN common-mode range of –0.3 V to +0.5 V, and compatibility with low-noise precision op-amp drivers such as OPA365 for vibration analysis and remote sensing systems.

Technical Context

The ADS8325IDGKT implements a capacitive redistribution SAR architecture with integrated sample-and-hold, enabling single-cycle 16-bit conversion without pipeline delay. Its differential input accepts signals up to VREF in amplitude, with –IN constrained to –0.3 V to +0.5 V to maintain linearity, while +IN tracks –IN + VREF.

It uses an external CMOS/LVCMOS clock (24 kHz–2.4 MHz) synchronized to DCLOCK, outputs straight-binary data MSB-first on DOUT, and enters ultra-low-power shutdown (<0.2 µA at 5 V) when CS/SHDN is high-making it suitable for duty-cycled, energy-constrained measurement nodes.

Key Specifications

Pinout & Package

ADS8325IDGKT is packaged in an 8-pin MSOP (DGK), 3.0 mm × 3.0 mm, 0.65 mm pitch, with exposed thermal pad internally connected to substrate (recommended to connect to analog ground).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS8325IDGKT, ADS8326IDGKT adds integrated reference and PGA at higher power and cost, while ADS8860IDRCT trades supply flexibility and ultra-low-power shutdown for higher speed and lower noise-making ADS8325IDGKT optimal for battery-operated, medium-speed, externally referenced precision DAQ.

Availability

ADS8325IDGKT is available at Aetrix Electronics and suitable for battery-operated instrumentation, isolated data acquisition, and vibration analysis systems requiring stable component supply, long-term manufacturability, and TI's industry-standard quality assurance.

Supply support for ADS8325IDGKT 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The ADS8325IDGKT belongs to TI's precision data converter product line, designed specifically for high-resolution, low-power, serial-output analog-to-digital conversion in portable, isolated, and multi-channel data acquisition systems.

FAQ

What is the maximum clock frequency supported by ADS8325IDGKT?

The ADS8325IDGKT supports an external DCLOCK input from 24 kHz to 2.4 MHz. At 2.4 MHz, it achieves its full 100 kSPS throughput with 24 clock cycles per conversion. The minimum high/low pulse width is 200 ns (for VDD ≥ 4.75 V), and duty cycle is not strictly constrained-enabling flexible clock source selection including MCU GPIO timers or dedicated oscillators.

Does ADS8325IDGKT require an external reference voltage?

Yes, ADS8325IDGKT requires an external reference voltage applied to the REF pin. It accepts any stable voltage from 2.5 V to VDD (2.7 V–5.5 V). The reference directly defines the full-scale range and LSB size-for example, a 5 V reference yields 76.3 µV/LSB, while 2.5 V yields 38.15 µV/LSB. Internal reference is not provided; reference input impedance exceeds 5 GΩ when CS = VDD.

What is the function of the CS/SHDN pin on ADS8325IDGKT?

The CS/SHDN pin on ADS8325IDGKT serves dual functions: when pulled low, it acts as chip select to enable serial communication and initiate conversions; when driven high, it places the device into shutdown mode, reducing supply current to ≤0.2 µA (at 5 V) or ≤0.1 µA (at 3 V). This enables aggressive power cycling in battery-powered systems without external power switches.

Can ADS8325IDGKT interface directly with a 3.3 V microcontroller?

Yes, ADS8325IDGKT supports LVCMOS logic levels at 2.7 V–3.6 V supply, with VIH ≥ 2 V and VIL ≤ 0.8 V-fully compatible with standard 3.3 V MCUs. Its DOUT output drives 4.44 V (min) at VDD = 4.5 V, but at VDD = 3.3 V, VOH is VDD – 0.2 V (≥3.1 V), ensuring reliable high-level recognition. No level-shifting is required for 3.3 V hosts operating within the specified supply range.

What is the absolute maximum differential input voltage for ADS8325IDGKT?

The absolute maximum differential input voltage (+IN – –IN) for ADS8325IDGKT is limited to the reference voltage VREF, as stated in the datasheet. Exceeding VREF risks missing codes and degraded INL. Additionally, the –IN pin must remain within –0.3 V to +0.5 V, and +IN must stay between –0.3 V and VDD + 0.3 V-or between –IN and –IN + VREF-whichever bound is tighter. Violating these ranges compromises linearity and may cause permanent damage.