Texas Instruments ADS8325IBDGKR

Overview

ADS8325IBDGKR 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 delivers ±1.5 LSB typical integral linearity, 3 LSB_PP noise, and operates from 2.7 V to 5.5 V. It is used in isolated data acquisition systems requiring high resolution and low power.

For engineers reviewing the ADS8325IBDGKR datasheet, ADS8325IBDGKR pinout, ADS8325IBDGKR application, or ADS8325IBDGKR equivalent, key selection considerations include its MSOP-8 package, differential input range up to V_REF, 100 kSPS throughput, power-down mode enabling <1 μA standby current, and compatibility with 2.5 V–5.5 V reference voltages.

Technical Context

The ADS8325IBDGKR implements a capacitive redistribution SAR architecture with integrated sample-and-hold, enabling single-cycle 16-bit conversion without pipeline delay. Its differential input accepts common-mode signals from –0.3 V to +0.5 V on –IN while supporting full-scale differential swing up to V_REF.

It uses an external CMOS-compatible clock (24 kHz–2.4 MHz) to control conversion timing and serial output; data is output MSB-first on DOUT synchronized to DCLOCK falling edge. The CS/SHDN pin serves dual function: chip select (active-low) and shutdown control (high).

Key Specifications

Pinout & Package

ADS8325IBDGKR is housed in an 8-pin MSOP package (DGK), 3.0 mm × 3.0 mm × 1.0 mm, 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 ADS8325IBDGKR, ADS8326IBDGKR adds integrated reference and PGA at higher cost and power, while ADS8860IDRCT trades differential input and hardware shutdown for higher speed and lower quiescent current-making each suitable for distinct subsystem requirements.

Availability

ADS8325IBDGKR is available at Aetrix Electronics and suitable for battery-operated data loggers, isolated industrial sensors, vibration analysis front-ends, and remote analog I/O modules requiring stable component supply and long-term manufacturability.

Supply support for ADS8325IBDGKR 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 company specializing in analog and embedded processing technologies, with leadership in precision data converters and low-power signal chain solutions.

The ADS8325IBDGKR belongs to TI's precision SAR ADC product line, designed for high-resolution, low-power data acquisition in portable, isolated, and multi-channel industrial systems where accuracy, noise immunity, and energy efficiency are critical.

FAQ

What is the maximum clock frequency supported by ADS8325IBDGKR?

The ADS8325IBDGKR supports an external DCLOCK input from 24 kHz to 2.4 MHz. At 2.4 MHz, it achieves its full 100 kSPS throughput rate with 24 clock cycles per conversion. Clock duty cycle is flexible as long as high/low times exceed 200 ns (for VDD ≥ 4.75 V). Exceeding 2.4 MHz may cause timing violations and invalid conversions in the ADS8325IBDGKR.

Does ADS8325IBDGKR require an external reference voltage?

Yes, the ADS8325IBDGKR 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 (e.g., 76.3 µV/LSB at 5 V). No internal reference is present-omitting the external reference will result in undefined conversion results in the ADS8325IBDGKR.

Can ADS8325IBDGKR operate with a 3.3 V supply and 2.5 V reference?

Yes, the ADS8325IBDGKR is fully specified for 2.7 V–3.6 V low-voltage operation. With VDD = 3.3 V and VREF = 2.5 V, it maintains 16-bit resolution and no missing codes, though INL degrades slightly to ±4 LSB max and ENOB drops to 13.9 bits. Power dissipation falls to 2.25 mW at 100 kSPS, making this configuration ideal for ultra-low-power 3.3 V systems using precision 2.5 V references.

What is the function of the CS/SHDN pin on ADS8325IBDGKR?

The CS/SHDN pin on ADS8325IBDGKR serves two functions: when pulled low, it enables serial communication and initiates conversions; when driven high, it places the device into hardware shutdown mode, reducing supply current to 0.2 µA (at 5 V) or 0.1 µA (at 3 V). This dual-role pin eliminates the need for separate enable/shutdown logic and simplifies power sequencing in the ADS8325IBDGKR.

Is ADS8325IBDGKR pin-compatible with older 12-bit TI ADCs?

Yes, the ADS8325IBDGKR is explicitly pin-compatible with the ADS7816, ADS7822, ADS7826, ADS7827, ADS7829, and ADS8320 in the same MSOP-8 (DGK) package. This allows direct replacement in existing layouts to upgrade resolution from 12-bit to 16-bit without PCB revision-provided the host system supports the extended 16-bit serial word length and updated timing requirements of the ADS8325IBDGKR.