Texas Instruments ADS8325IBDRBT

Overview

ADS8325IBDRBT 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 supply. It is used in isolated data acquisition systems requiring high resolution and low power.

For engineers reviewing the ADS8325IBDRBT datasheet, ADS8325IBDRBT pinout, ADS8325IBDRBT application, or ADS8325IBDRBT equivalent, key selection considerations include its SON-8 package, differential input range up to V_REF, 100 kSPS throughput, power-down mode enabling sub-μW standby, and compatibility with 2.5 V–5.5 V references.

Technical Context

The ADS8325IBDRBT implements a capacitive redistribution successive approximation register (SAR) architecture with integrated sample-and-hold, fabricated in 0.6 μm CMOS. Its differential analog input (+IN/–IN) captures voltage difference directly without resampling –IN during conversion, supporting common-mode rejection within –0.3 V to +0.5 V on –IN.

It uses an external clock (24 kHz–2.4 MHz) for timing control and outputs straight-binary data MSB-first via DOUT synchronized to DCLOCK. The CS/SHDN pin serves dual function: chip select (active-low) and shutdown enable (high), allowing rapid entry/exit from ultra-low-power state with 0.6 μW dissipation at 5 V.

Key Specifications

Pinout & Package

ADS8325IBDRBT is housed in an 8-pin SON (Small Outline No-lead) package (DRB), 3 mm × 3 mm × 0.9 mm, with exposed thermal pad internally connected to substrate. The pad may be connected to analog ground or left floating but must be kept separate from digital ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8326IBDRBT and ADS8322IBDRBT, the ADS8325IBDRBT uniquely balances external reference flexibility, guaranteed monotonicity, and industry-leading SFDR (–108 dB), making it optimal for high-fidelity isolated acquisition where reference accuracy and harmonic distortion matter.

Availability

ADS8325IBDRBT is available at Aetrix Electronics and suitable for remote data acquisition, isolated data acquisition, and industrial control systems requiring stable component supply, long-term manufacturability, and guaranteed 16-bit monotonicity across temperature.

Supply support for ADS8325IBDRBT 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 high-performance signal chain solutions.

The ADS8325IBDRBT belongs to TI's precision data converter product line, designed specifically for portable, isolated, and multi-channel industrial measurement systems demanding 16-bit resolution with microPower efficiency and robust serial interfacing.

FAQ

What is the maximum clock frequency supported by the ADS8325IBDRBT?

The ADS8325IBDRBT supports a maximum DCLOCK frequency of 2.4 MHz, which corresponds to its full 100 kSPS throughput rate (24 clock cycles per conversion). At this rate, the conversion time is 6.667 μs. Lower clock frequencies down to 24 kHz are also supported for reduced throughput and further power savings. The device does not require a fixed duty cycle, only minimum high/low times of 200 ns at VDD ≥ 4.75 V.

Does the ADS8325IBDRBT have an internal voltage reference?

No, the ADS8325IBDRBT does not include an internal voltage reference. It requires an external reference applied to the REF pin, which must be between 2.5 V and VDD. This design allows users to select high-accuracy, low-drift external references (e.g., REF5025) or leverage existing system rails, giving full control over reference stability, temperature coefficient, and noise performance-critical for metrology-grade applications.

What is the meaning of "IB" in the ADS8325IBDRBT part number?

The "IB" suffix in ADS8325IBDRBT denotes the improved grade variant: ±1.5 LSB typical integral linearity error (vs ±3 LSB for standard "I"), ±4 LSB max INL (vs ±6 LSB), and guaranteed 16-bit no-missing-codes performance. It is specified over the full –40°C to +85°C industrial temperature range and shipped in tape-and-reel packaging (250 units per reel) in the SON-8 (DRB) package.

Can the ADS8325IBDRBT operate from a 3.3 V supply?

Yes, the ADS8325IBDRBT is fully specified to operate from a 2.7 V to 5.5 V supply. At VDD = 3.3 V, it maintains 100 kSPS throughput, 16-bit resolution, and ±1.5 LSB typical INL. Digital I/O is LVCMOS-compatible, with VIH = 2.0 V min and VIL = 0.8 V max at 2.7 V supply. Power dissipation drops to ~2.25 mW at 100 kSPS, and power-down current remains at 0.2 μA.

How does the CS/SHDN pin function in the ADS8325IBDRBT?

The CS/SHDN pin on the ADS8325IBDRBT serves two distinct functions: when driven low, it enables serial communication and initiates conversions (chip select mode); when driven high, it places the device into ultra-low-power shutdown mode, reducing supply current to 0.2 μA at 5 V (0.1 μA at 3 V). Exit from shutdown requires CS transition low followed by valid clock edge; full functionality resumes within 1 μs, with no reset sequence needed.