Texas Instruments ADS8326IBDRBT

Overview

ADS8326IBDRBT from Texas Instruments is a 16-bit, SAR analog-to-digital converter with differential input, SPI/SSI-compatible serial interface, and microPower operation (2mW at 2.7V/100kHz). It delivers ±1.5 LSB max INL, 14.35-bit ENOB at 10kHz, and supports 0.1V–VDD reference voltage range. It is used in isolated data acquisition modules requiring high precision and low power.

For engineers reviewing the ADS8326IBDRBT datasheet, ADS8326IBDRBT pinout, ADS8326IBDRBT application, or ADS8326IBDRBT equivalent, key selection considerations include its SON-8 package, 200kSPS throughput at 2.7V, ±1LSB max DNL, shutdown current of 0.2μA, and compatibility with low-voltage LVCMOS logic.

Technical Context

The ADS8326IBDRBT implements a capacitive redistribution SAR architecture with integrated sample-and-hold, enabling single-cycle acquisition and conversion without external components. Its internal clock synchronization via DCLOCK pin allows deterministic timing control across varying supply voltages (2.7V–5.5V).

It features a true differential analog input stage with 20pF differential input capacitance and 50Ω on-resistance when active, supporting common-mode rejection over –0.3V to 0.5V. The reference input accepts 0.1V–VDD with 24pF capacitance and programmable current draw scaling linearly with sampling rate.

Key Specifications

Pinout & Package

ADS8326IBDRBT is housed in an 8-pin SON (Small Outline No-lead) package, 3 mm × 3 mm × 0.9 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 ADS8326IBDRBT, ADS8325IDRBT trades microPower operation for speed, while AD7682BRMZ sacrifices differential input integrity for marginally better AC specs - making ADS8326IBDRBT optimal for isolated, battery-constrained, differential-sensor systems.

Availability

ADS8326IBDRBT is available at Aetrix Electronics and suitable for remote data acquisition, isolated industrial sensing, and portable vibration analysis requiring stable component supply and long-term manufacturability.

Supply support for ADS8326IBDRBT 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 converters and low-power design.

The ADS8326IBDRBT belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power, and small-footprint applications in portable instrumentation and isolated industrial systems.

FAQ

What is the maximum sampling rate of the ADS8326IBDRBT at 2.7V supply?

The ADS8326IBDRBT achieves a maximum throughput rate of 200 kSPS when operated at 2.7V supply voltage and 4.8 MHz DCLOCK frequency. This is confirmed in the Electrical Characteristics table for VDD = +2.7V, where "Throughput rate" is specified as 200 kSPS. At this rate, power dissipation is 3.73 mW, and integral linearity error remains within ±2.5 LSB.

Does the ADS8326IBDRBT support true differential input operation?

Yes, the ADS8326IBDRBT supports true differential input operation via dedicated +IN and –IN pins. The device samples the voltage difference (+IN – –IN) with full 16-bit resolution and maintains specified linearity (±1.5 LSB INL max) across the common-mode range of –0.3V to 0.5V. This architecture enables high common-mode rejection without external instrumentation amplifiers.

What is the function of the CS/SHDN pin on the ADS8326IBDRBT?

The CS/SHDN pin on the ADS8326IBDRBT serves dual functions: when driven low, it acts as chip select to initiate conversion and enable serial data output on DOUT; when driven high, it places the device into shutdown mode, reducing supply current to 0.2 μA. This pin is not level-sensitive for conversion timing - the falling edge triggers sampling, and conversion proceeds synchronously with DCLOCK.

Can the ADS8326IBDRBT operate with a 1.8V reference voltage?

Yes, the ADS8326IBDRBT supports reference voltages as low as 0.1V and up to VDD, so a 1.8V reference is fully supported when VDD ≥ 1.8V. With VDD = 2.7V and VREF = 1.8V, the full-scale range becomes 1.8V differential, yielding ~27.5 μV/LSB resolution. Reference input current scales with sampling rate (e.g., 25–33 μA at 100kSPS), requiring appropriate driver capability.

Which package type does the ADS8326IBDRBT use, and what are its thermal characteristics?

The ADS8326IBDRBT uses the DRB package: an 8-pin SON (3 mm × 3 mm) with exposed thermal pad. Its thermal resistance values are RθJA = 45.8°C/W and RθJC = 5°C/W. At TA = +85°C, maximum power rating is 148 mW. The thermal pad should be soldered to a dedicated analog ground plane to maintain junction temperature within –40°C to +125°C limits during continuous 200kSPS operation.