Texas Instruments ADS8320EB/2K5

Overview

ADS8320EB/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 1.8 mW power consumption at 2.7 V, differential ±In/+In inputs, SPI/SSI-compatible serial interface, and operates from 2.7 V to 5.25 V. It is used in battery-powered remote sensing nodes requiring precision and microPower operation.

For engineers reviewing the ADS8320EB/2K5 datasheet, ADS8320EB/2K5 pinout, ADS8320EB/2K5 application, or ADS8320EB/2K5 equivalent, key selection criteria include guaranteed 15-bit no-missing-codes performance, ±0.006% integral linearity error, 92-dB SNR at 10 kHz, differential input architecture with remote ground sensing capability, and compatibility with 3-V and 5-V logic systems.

Technical Context

The ADS8320EB/2K5 implements a capacitive redistribution SAR architecture with integrated sample-and-hold, enabling single-cycle acquisition and conversion without pipeline latency. Its internal CDAC and comparator operate synchronously with external DCLOCK, supporting clock frequencies from 24 kHz to 2.4 MHz to scale throughput from 1 kHz to 100 kHz.

It uses a synchronous 3-wire serial interface (CS/SHDN, DCLOCK, DOUT) with MSB-first straight-binary output timed to falling DCLOCK edges. The device supports dual supply-voltage operation (2.7 V or 5 V), accepts reference voltages from 0.5 V to VCC, and features CMOS-compatible digital I/O with level-shifting tolerance - inputs accept up to 5.5 V regardless of VCC.

Key Specifications

Pinout & Package

ADS8320EB/2K5 is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm body size), optimized for space-constrained PCB layouts while maintaining thermal performance (R_θJA = 163.1°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution, low-power SAR ADC applications.

Compared with ADS8320E/2K5, the ADS8320EB/2K5 provides tighter linearity and extended missing-code performance essential for metrology; versus ADS7816U, it delivers differential input capability and microPower operation critical for portable and isolated systems - neither is pin-compatible nor drop-in.

Availability

ADS8320EB/2K5 is available at Aetrix Electronics and suitable for battery-operated remote sensors, isolated industrial data acquisition, and simultaneous multichannel sampling systems requiring stable component supply and long-term manufacturability.

Supply support for ADS8320EB/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 company specializing in analog, embedded processing, and connectivity technologies, with leadership in precision data converters and low-power design.

The ADS8320EB/2K5 belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power data acquisition in portable, isolated, and multichannel instrumentation systems.

FAQ

What is the guaranteed linearity performance of the ADS8320EB/2K5?

The ADS8320EB/2K5 guarantees ±0.006% integral linearity error (INL) over temperature and supply voltage, corresponding to <±1 LSB error with a 5-V reference. This specification is validated across the full operating range (–40°C to +85°C, 2.7 V to 5.25 V) and distinguishes it from the ADS8320E/2K5 grade, which specifies ±0.008% INL. The ADS8320EB/2K5 also ensures 15-bit no-missing-codes performance, making it suitable for metrology-grade applications.

Does the ADS8320EB/2K5 support true differential input operation?

Yes, the ADS8320EB/2K5 supports true differential input operation via dedicated +In and –In pins. Unlike pseudo-differential architectures, the –In input is sampled simultaneously with +In and held on the internal capacitor array, enabling genuine differential acquisition. However, the –In voltage range is limited to –0.1 V to 0.5 V (at 2.7 V supply) or 1 V (at 5 V supply), so it is primarily intended for remote ground sensing rather than full-rail differential signaling. The ADS8320EB/2K5 does not support programmable input ranges or internal PGA.

What is the minimum and maximum clock frequency supported by the ADS8320EB/2K5?

The ADS8320EB/2K5 supports DCLOCK frequencies from 24 kHz (for 1-kHz throughput) up to 2.4 MHz (for 100-kHz throughput). Minimum pulse width is 200 ns for both high and low states when VCC ≥ 2.7 V. Clock duty cycle is not critical, but setup/hold timing must be met: tSUCS (CS falling to DCLOCK rising) ≥ 20 ns, and thDO (DCLOCK falling to DOUT validity) ≤ 15 ns. The ADS8320EB/2K5 does not include an internal oscillator and relies entirely on this external clock for conversion timing.

How does power consumption scale with sample rate in the ADS8320EB/2K5?

ADS8320EB/2K5 power consumption scales nearly linearly with sample rate due to its SAR architecture. At 100 kHz and 2.7 V, quiescent current is 650–1300 µA (1.8 mW). At 10 kHz, it drops to ~100 µA (0.3 mW), and in shutdown (CS = HIGH), it draws ≤3 µA. This behavior enables aggressive duty cycling - for example, sampling once per second reduces average power to <1 µW. The ADS8320EB/2K5 achieves this efficiency through rapid power-down entry/exit and minimal bias current in hold mode.

Is the ADS8320EB/2K5 compatible with 3.3-V microcontrollers when powered from 2.7 V?

Yes, the ADS8320EB/2K5 is fully compatible with 3.3-V microcontrollers even when powered from 2.7 V. Its digital inputs (CS/SHDN, DCLOCK) tolerate voltages up to 5.5 V regardless of VCC, allowing direct connection to 3.3-V logic outputs. Its DOUT output swings from 0 V to VCC (2.7 V), which meets the VIH threshold (>2.0 V) of most 3.3-V CMOS inputs. For robust noise immunity, a series resistor (e.g., 100 Ω) is recommended on DOUT when interfacing to higher-voltage logic domains.