Texas Instruments ADS8325IBDRBR

Overview

ADS8325IBDRBR from Texas Instruments is a 16-bit, SAR-based 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 ADS8325IBDRBR datasheet, ADS8325IBDRBR pinout, ADS8325IBDRBR application, or ADS8325IBDRBR equivalent, key selection considerations include its SON-8 package, 100 kSPS throughput, differential input range up to VREF, shutdown mode (0.2 µA), and compatibility with low-noise signal chains requiring <3 LSBPP noise and no missing codes.

Technical Context

The ADS8325IBDRBR implements a capacitive redistribution SAR architecture with integrated sample-and-hold, enabling single-cycle 100 kSPS conversion without pipeline delay. Its differential input accepts common-mode voltages from –0.3 V to +0.5 V on –IN and full-scale differential swing up to VREF, with internal CDAC and comparator driving synchronous serial output.

It uses an external 24 kHz–2.4 MHz clock (DCLOCK) for timing control; CS/SHDN serves dual function - chip select when low, power-down enable when high. Data is MSB-first, straight-binary, and appears on DOUT synchronized to DCLOCK falling edge with tEN ≤ 50 ns.

Key Specifications

Pinout & Package

ADS8325IBDRBR is housed in an 8-pin SON package (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad internally connected to substrate. The pad may be connected to analog ground or left floating but must remain isolated 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 ADS8326IBDRBR, ADS8325IBDRBR offers lower power and external reference flexibility; compared with ADS8860IDRCT, it provides wider supply range, shutdown capability, and better low-frequency linearity - making it optimal for industrial and isolated sensing where precision and power efficiency coexist.

Availability

ADS8325IBDRBR is available at Aetrix Electronics and suitable for battery-operated instrumentation, isolated data acquisition modules, vibration analysis systems, and robotics torque sensing requiring stable component supply and long-term manufacturability.

Supply support for ADS8325IBDRBR 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 over 50 years of innovation in precision data converters and power management ICs.

The ADS8325IBDRBR belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power, and robust performance in harsh industrial environments - particularly where differential input, microPower operation, and small-footprint packaging are mandatory.

FAQ

What is the maximum clock frequency supported by ADS8325IBDRBR?

The ADS8325IBDRBR 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 24 clock cycles per conversion. Operating below 24 kHz reduces throughput proportionally, and minimum pulse widths must exceed 200 ns when VDD ≥ 4.75 V to ensure reliable timing margins.

Does ADS8325IBDRBR require an external reference voltage?

Yes, ADS8325IBDRBR requires an external reference voltage applied to the REF pin. It accepts any stable voltage from 2.5 V to VDD, which directly defines the full-scale input range (+IN – –IN). No internal reference is provided; omitting the external reference will result in undefined conversion results and potential damage if REF exceeds absolute maximum ratings.

How does the CS/SHDN pin function in ADS8325IBDRBR?

The CS/SHDN pin on ADS8325IBDRBR serves dual roles: when driven low, it enables serial communication and initiates conversions; when driven high, it places the device into shutdown mode, reducing supply current to 0.2 µA (at 5 V). This dual functionality eliminates the need for separate control lines, simplifying interface design in power-sensitive applications.

What is the differential input voltage range specification for ADS8325IBDRBR?

The differential input voltage range for ADS8325IBDRBR is 0 V to VREF, where VREF is the voltage applied to the REF pin. The –IN pin must remain within –0.3 V to +0.5 V, and +IN must stay within –IN to –IN + VREF. Exceeding these limits degrades linearity and may cause permanent damage per absolute maximum ratings.

Is ADS8325IBDRBR pin-compatible with other devices in the ADS78xx family?

Yes, ADS8325IBDRBR is explicitly pin-compatible with ADS7816, ADS7822, ADS7826, ADS7827, ADS7829, and ADS8320 per TI's datasheet. This allows direct replacement in existing MSOP-8 or SON-8 layouts - though functional differences (e.g., resolution, power, reference handling) require firmware and schematic validation before substitution.