Texas Instruments ADS8326IBDGKR

Overview

ADS8326IBDGKR 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 operates from –40°C to +85°C in MSOP-8 package - ideal for isolated data acquisition and battery-powered precision sensing.

For engineers reviewing the ADS8326IBDGKR datasheet, ADS8326IBDGKR pinout, ADS8326IBDGKR application, or ADS8326IBDGKR equivalent, key selection considerations include its 16-bit no-missing-codes performance, low-noise 30 μVRMS, differential input architecture, power-down mode (0.3 μW), and compatibility with 2.7V–5.5V supplies and external reference scaling from 0.1V to VDD.

Technical Context

The ADS8326IBDGKR implements a capacitive redistribution SAR architecture with integrated sample-and-hold, enabling single-cycle conversion without external components. Its differential input supports common-mode rejection and flexible reference configuration (0.1V to VDD).

Timing is controlled by an external DCLOCK signal (24 kHz–6 MHz), requiring 22 clock cycles per 16-bit conversion. The CS/SHDN pin serves dual function: chip select (active-low) and shutdown control (high), enabling rapid power-state transitions with 70 ns DOUT tri-state enable.

Key Specifications

Pinout & Package

ADS8326IBDGKR is housed in an MSOP-8 (DGK) package with exposed thermal pad internally connected to substrate; pad may be tied 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 ADS8326IBDGKR, ADS8325IDGKR offers higher speed at cost of power and reference inflexibility, while AD7682BRMZ trades differential input capability and REF scalability for slightly lower noise floor in single-ended configurations.

Availability

ADS8326IBDGKR is available at Aetrix Electronics and suitable for battery-operated systems, isolated data acquisition modules, and remote vibration monitoring requiring stable component supply and long-term manufacturability.

Supply support for ADS8326IBDGKR 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 delivering analog and embedded processing solutions, with deep expertise in precision data converters and low-power signal chain design.

The ADS8326IBDGKR belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power, and small-footprint applications in portable instrumentation, industrial sensing, and isolated measurement systems.

FAQ

What is the maximum sampling rate supported by the ADS8326IBDGKR?

The ADS8326IBDGKR achieves 200 kSPS at 2.7V and 250 kSPS at 5V. This is determined by the external DCLOCK frequency: 4.8 MHz yields 200 kSPS (24 × fSAMPLE), while 6 MHz yields 250 kSPS. Conversion time is fixed at 16 DCLOCK cycles, and total cycle time requires 22 clocks for complete 16-bit word transfer. The ADS8326IBDGKR does not support oversampling or decimation modes.

Does the ADS8326IBDGKR require an external reference voltage?

Yes, the ADS8326IBDGKR requires an external reference applied to the REF pin. It accepts any voltage from 0.1V to VDD, enabling ratiometric measurements with sensors or flexible full-scale adjustment. The device does not include an internal reference; reference input resistance is 5 GΩ (CS = GND), and input capacitance is 24 pF - compatible with standard reference buffers and low-ESR decoupling.

How does the CS/SHDN pin function on the ADS8326IBDGKR?

The CS/SHDN pin on the ADS8326IBDGKR serves two distinct roles: when pulled low, it enables the device and initiates conversion upon DCLOCK edges; when driven high, it places the ADS8326IBDGKR into ultra-low-power shutdown mode (0.3 μW at 2.7V). There is no intermediate state - the transition is immediate, and DOUT enters high-impedance within 70 ns of CS rising. This dual functionality eliminates need for separate enable/shutdown circuitry.

Can the ADS8326IBDGKR operate with a 3.3V supply and still achieve full 16-bit performance?

Yes, the ADS8326IBDGKR is fully specified for 2.7V–5.5V operation, including 3.3V nominal supplies. At 3.3V, it maintains 16-bit no-missing-codes performance, ±1.5 LSB max INL, and 200 kSPS throughput (with DCLOCK ≤ 4.8 MHz). Power dissipation drops to ~3.7 mW, and digital I/O thresholds adapt to LVCMOS levels (VIH = 2.0V min, VIL = 0.8V max), ensuring reliable interface with 3.3V microcontrollers.

What is the input structure of the ADS8326IBDGKR, and how should it be driven?

The ADS8326IBDGKR features a switched-capacitor SAR input with differential +IN/–IN terminals. During sampling, input resistance is 100–150 Ω (on) and input capacitance is 48 pF (single-ended) or 20 pF (differential). To ensure accuracy, drive sources must settle within 0.9375 μs (at 4.8 MHz DCLOCK) and provide low-impedance paths - typically via op-amp buffers or RC filters with R ≤ 10 Ω and C ≤ 1 nF. Unbuffered high-impedance sources cause gain error and distortion.