Texas Instruments ADS8320E/2K5

Overview

ADS8320E/2K5 from Texas Instruments is a 16-bit successive approximation register (SAR) analog-to-digital converter optimized for high-speed, low-power data acquisition. It delivers 100-kHz throughput with ±0.008% integral linearity error, 82-dB SINAD at 10 kHz, and operates from 2.7 V to 5.25 V supply. Its differential input (+In/–In), external reference (0.5 V to VCC), and SPI/SSI-compatible serial interface make it suitable for battery-powered remote sensing and isolated industrial measurement systems.

For engineers reviewing the ADS8320E/2K5 datasheet, ADS8320E/2K5 pinout, ADS8320E/2K5 application, or ADS8320E/2K5 equivalent, key selection considerations include its 16-bit resolution with no missing codes (14-bit guaranteed), microPower operation (1.8 mW at 100 kHz/2.7 V), 8-pin VSSOP package, and compatibility with ADS7816/ADS7822 in pin layout and timing.

Technical Context

The ADS8320E/2K5 implements a capacitive redistribution SAR architecture with integrated sample-and-hold, enabling single-cycle acquisition and conversion without pipeline delay. It uses an external DCLOCK (24 kHz–2.4 MHz) and CS/SHDN-controlled conversion start, with serial output (DOUT) delivering 16-bit straight-binary data MSB-first on falling clock edges.

Its analog front-end supports true differential input with –In referenced to remote ground (–0.1 V to 0.5 V range at 2.7 V), while VREF sets full-scale span (0 to VREF). The device draws only 0.3 µA in power-down mode and maintains 16-bit resolution across –40°C to +85°C with <±3 µV/°C offset drift.

Key Specifications

Pinout & Package

ADS8320E/2K5 is housed in an 8-pin Very Small Outline Package (VSSOP) with 0.65-mm pitch, optimized for thermal performance (RθJA = 163.1°C/W) and board-area efficiency.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7816ID, ADS8320E/2K5 delivers 2-bit higher effective linearity and differential input capability; versus ADS8322IPW, it trades 0.002% INL and 2-dB SINAD for lower cost and broader availability-making ADS8320E/2K5 the optimal balance for industrial DAQ.

Availability

ADS8320E/2K5 is available at Aetrix Electronics and suitable for battery-operated systems, isolated data acquisition, simultaneous sampling architectures, and vibration analysis requiring stable component supply across extended production lifecycles.

Supply support for ADS8320E/2K5 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 ADS8320E/2K5 belongs to TI's high-performance SAR ADC product line, engineered specifically for portable, isolated, and multi-channel industrial data acquisition where resolution, power efficiency, and reliability are critical.

FAQ

What is the maximum sampling rate supported by the ADS8320E/2K5?

The ADS8320E/2K5 supports a maximum throughput rate of 100 kHz, achieved with a 2.4-MHz DCLOCK input. At this rate, conversion time is fixed at 16 clock cycles, and acquisition completes within 4.5 clock cycles. Lower rates (e.g., 10 kHz) reduce average power to 1.8 mW while maintaining full 16-bit performance. The ADS8320E/2K5 datasheet specifies timing limits for tSMPL and tCONV under both 2.7-V and 5-V supply conditions.

Does the ADS8320E/2K5 require an external reference voltage?

Yes, the ADS8320E/2K5 requires an external reference voltage applied to the VREF pin. It accepts any stable voltage from 0.5 V to VCC, directly setting the full-scale input range (0 to VREF). Reference current draw varies with sample rate-up to 80 µA at 100 kHz-and demands low-noise, well-bypassed sourcing. The ADS8320E/2K5 does not include an internal reference, making external precision references essential for calibrated measurements.

How does the differential input of the ADS8320E/2K5 improve noise immunity?

The ADS8320E/2K5 features true differential analog inputs (+In and –In), where the –In pin is sampled simultaneously with +In and held on the internal capacitor array-unlike pseudo-differential architectures. This enables rejection of common-mode noise coupled into both traces, especially when –In connects to a remote ground point. The ADS8320E/2K5 specification limits –In to –0.1 V to 0.5 V at 2.7 V, optimizing it for small ground-potential offsets rather than large common-mode swings.

Can the ADS8320E/2K5 operate from a 3.3-V supply?

Yes, the ADS8320E/2K5 operates across 2.7 V to 5.25 V, including standard 3.3-V logic supplies. At 3.3 V, it maintains 100-kHz throughput, 16-bit resolution, and 1.8-mW power dissipation. Digital I/O levels remain compatible with 5-V systems: inputs tolerate up to 5.5 V regardless of VCC, and DOUT swings 0 V to 3.3 V. The ADS8320E/2K5 datasheet confirms recommended operating conditions and electrical characteristics for 3.3-V operation in Section 6.3.

What is the significance of the CS/SHDN pin functionality in the ADS8320E/2K5?

The CS/SHDN pin serves dual functions: active-low chip select (CS) initiates conversion and serial data output, while driving it HIGH places the ADS8320E/2K5 into shutdown mode, reducing supply current to ≤3 µA. This enables precise power gating in duty-cycled systems-e.g., waking the ADS8320E/2K5 only during measurement bursts. The transition from shutdown to active requires no reset sequence, and conversion begins on the next CS falling edge, ensuring deterministic timing control.