Texas Instruments DAC9881EVM

Overview

DAC9881EVM from Texas Instruments is an evaluation module designed to accelerate functional and performance validation of the DAC9881 - an 18-bit, buffered voltage-output, serial-input digital-to-analog converter. It supports unipolar or configurable bipolar output modes, features a 50-MHz SPI interface, onboard ±5-V analog power rails, and a precision +5-V REF5050 reference for DC-optimized DAC testing in lab and design-integration environments.

For engineers reviewing the DAC9881EVM datasheet, DAC9881EVM pinout, DAC9881EVM application, or DAC9881EVM equivalent, this EVM provides full access to DAC9881 control signals (CS, SCLK, SDI/SDO, LDAC, RST, PDN), jumper-configurable output topologies (unity gain, gain-of-two, bipolar), Kelvin reference routing, and test points for INL/DNL characterization under real-world host-processor interfacing conditions.

Technical Context

The DAC9881EVM implements a four-layer FR-4 PCB (43.18 mm × 82.55 mm) with dedicated analog/digital ground and power planes to preserve the DAC9881's 18-bit DC accuracy. It routes all critical DAC interface signals-including SPI (CPOL = 0, CPHA = 0), GPIO-controlled LDAC/RST/PDN, and force-sense analog output-through dual-row pass-through headers J2 (top) and P2 (bottom).

Reference configuration uses Kelvin sensing via VREFHF/VREFHS and VREFLF/VREFLS pins, minimizing errors from reference current impedance. Output conditioning is supported by OPA211AIDR (U2) and OPA2277UA (U4), with jumper-selectable gain, polarity, and capacitive load drive modes enabled through W2–W12 and R1–R34 network.

Key Specifications

Availability

DAC9881EVM is available at Aetrix Electronics and suitable for high-precision DAC validation, analog subsystem prototyping, and embedded signal-chain development requiring stable component supply, traceable sourcing, and long-term tool continuity.

Supply support for DAC9881EVM 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 high-performance analog solutions for industrial, automotive, and communications applications.

The DAC9881EVM belongs to TI's Precision Analog Evaluation Modules product line, engineered to simplify rapid, accurate characterization of high-resolution DACs in real-world host-processor and signal-conditioning environments.

FAQ

What is the DAC9881EVM used for?

The DAC9881EVM is an evaluation module built to validate the functionality and DC performance of the DAC9881 18-bit voltage-output DAC. It enables engineers to test SPI communication, output linearity (INL/DNL), reference configuration, and analog output conditioning - including unipolar, bipolar, and gain-of-two modes - without designing custom hardware. DAC9881EVM integrates all necessary power, reference, and signal routing to accelerate lab evaluation and system-level integration of DAC9881.

Does the DAC9881EVM include the DAC9881 IC?

Yes, the DAC9881EVM includes the DAC9881SBRGET IC (U1) mounted on the board. This is the production-grade 18-bit, buffered voltage-output DAC with 24-bit SPI interface, force-sense output architecture, and Kelvin reference inputs. DAC9881EVM provides full access to its pins via headers and test points, enabling direct measurement and host-processor interfacing during evaluation.

How do I configure the DAC9881EVM for bipolar output?

To configure the DAC9881EVM for bipolar output, set jumpers per Table 4 in the SLAU279A User's Guide: W3 closed (connects VREFH to U2 inverting input), W5 to 1–2 (supplies VSS to U2 negative rail), W9 to 1–2 or 2–3 (routes DAC VOUT to U2 noninverting input), and W12 open (disconnects gain resistor). This configures the OPA211AIDR (U2) as a summing amplifier to offset and invert the DAC output, achieving ±5-V swing. DAC9881EVM supports this mode without component changes - only jumper reconfiguration.

What host interfaces does the DAC9881EVM support?

The DAC9881EVM supports standard SPI host interfaces with CPOL = 0 and CPHA = 0 timing, compatible with microcontrollers, DSPs (e.g., TI C5000/C6000), and FPGA-based systems. Digital control signals - CS, SCLK, SDI, SDO, LDAC, RST, PDN - are accessible via J2 (top) and P2 (bottom) 20-pin dual-row headers. An optional 5–6K Interface Board is available for plug-and-play connection to TI DSK platforms, eliminating custom cabling needs for DAC9881EVM integration.

Can I use my own voltage reference with the DAC9881EVM?

Yes, the DAC9881EVM supports external voltage references via test points TP8 (VREFH, 1.25–5.5 V) and TP1 (VREFL, ±0.2 V), or through J4 pins 18 (VREFH) and 20 (VREFL). Jumpers W4 and W8 select between onboard REF5050 and external sources. When using external references, ensure VREFH does not exceed AVDD to prevent damage to DAC9881. The DAC9881EVM maintains Kelvin connections (VREFHF/VREFHS, VREFLF/VREFLS) regardless of source, preserving reference accuracy and minimizing impedance-induced error in DAC9881 operation.