Texas Instruments ADS8325IDRBR

Overview

ADS8325IDRBR 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 supports 2.7V–5.5V supply, 2.5V–VDD reference, ±1.5 LSB typical INL, and 14.7-bit ENOB at 1 kHz - deployed in isolated data acquisition and battery-powered precision sensing.

For engineers reviewing the ADS8325IDRBR datasheet, ADS8325IDRBR pinout, ADS8325IDRBR application, or ADS8325IDRBR equivalent, key selection considerations include its SON-8 package thermal pad handling, differential input common-mode range (–0.3 V to +0.5 V), power-down current (0.2 µA at 5 V), 100 kSPS throughput, and compatibility with ADS7816/ADS7822 pinouts for legacy upgrades.

Technical Context

The ADS8325IDRBR implements a capacitive redistribution SAR architecture with integrated sample-and-hold, enabling single-cycle 100 kSPS conversion without pipeline delay. Its differential analog front-end accepts inputs up to VREF full-scale with fixed –IN common-mode constraints and supports external reference voltages from 2.5 V to VDD.

It uses a synchronous serial interface with MSB-first output on DOUT, driven by DCLOCK (24 kHz–2.4 MHz), and features dual-mode CS/SHDN control: active-low chip select and active-high shutdown. Conversion timing is deterministic - 16 clock cycles for conversion, 4.5 clock cycles for sampling - and operates across –40°C to +85°C.

Key Specifications

Pinout & Package

ADS8325IDRBR is housed in an 8-pin SON package (DRB), 3 mm × 3 mm × 0.9 mm, with exposed thermal pad internally connected to substrate - recommended to connect to analog ground (not digital ground) for optimal noise performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8326IDRBR and ADS8860IDRCT, the ADS8325IDRBR offers superior differential input performance and lowest power in true differential configurations - making it the optimal choice for isolated, remote, or battery-operated precision measurement where noise immunity and energy efficiency are co-prioritized.

Availability

ADS8325IDRBR is available at Aetrix Electronics and suitable for battery-operated systems, isolated data acquisition, and simultaneous sampling multi-channel systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS8325IDRBR 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, embedded processing, and connectivity technologies with over 90 years of innovation in precision signal chain solutions.

The ADS8325IDRBR belongs to TI's precision data converter product line, engineered for high-resolution, low-power, and robust industrial sensing - targeting applications where accuracy, noise immunity, and energy efficiency intersect.

FAQ

What is the maximum clock frequency supported by the ADS8325IDRBR?

The ADS8325IDRBR supports a DCLOCK input frequency range of 24 kHz to 2.4 MHz. At 2.4 MHz, it achieves its full 100 kSPS throughput with 16 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 data.

Does the ADS8325IDRBR require an external reference voltage?

Yes, the ADS8325IDRBR requires an external reference voltage applied to the REF pin. It accepts 2.5 V to VDD (2.7 V–5.5 V), and the reference directly defines the full-scale input range (+IN – –IN). No internal reference is present - omitting the external reference will result in undefined conversion results.

How does the CS/SHDN pin function in the ADS8325IDRBR?

The CS/SHDN pin serves dual roles: pulled low to initiate conversion and enable serial output (chip select mode), or driven high to place the ADS8325IDRBR into ultra-low-power shutdown (0.2 µA at 5 V). During shutdown, DOUT goes high-impedance and internal circuitry is disabled - recovery time is negligible upon CS reassertion.

What is the purpose of the thermal pad on the ADS8325IDRBR SON package?

The exposed thermal pad on the ADS8325IDRBR (DRB package) is internally connected to the silicon substrate. Texas Instruments recommends connecting it to analog ground (not digital ground) to improve thermal dissipation and reduce noise coupling. Leaving it floating is acceptable but degrades thermal performance and may increase analog noise.

Can the ADS8325IDRBR interface directly with a microcontroller SPI port?

Yes, the ADS8325IDRBR is SPI/SSI-compatible and interfaces directly with standard microcontroller SPI peripherals using three lines: CS/SHDN (as chip select), DCLOCK (as SCLK), and DOUT (as MOSI/MISO depending on direction). It uses MSB-first, no dummy cycles, and supports standard CMOS/LVCMOS logic levels - no level-shifting needed for 3.3 V or 5 V MCUs.