Texas Instruments ADS2806-EVM

Overview

ADS2806-EVM from Texas Instruments is an evaluation module designed specifically for the ADS2806 12-bit, 32-MSPS dual-channel analog-to-digital converter. It provides transformer-coupled single-ended AC input, selectable 2V_pp/3V_pp input range, internal/external reference selection, and isolated CMOS-buffered digital outputs. The board supports full-speed data capture and jitter-sensitive clock evaluation for high-fidelity signal acquisition systems.

For engineers reviewing the ADS2806-EVM datasheet, ADS2806-EVM pinout, ADS2806-EVM application, or ADS2806-EVM equivalent, this module enables rapid validation of ADS2806 performance in undersampled RF receiver chains, communications test equipment, and high-speed data acquisition subsystems - with attention to clock jitter sensitivity, over-range detection timing, and dual-channel synchronization behavior.

Technical Context

The ADS2806-EVM implements a fixed-architecture signal path optimized for the ADS2806 ADC: single-ended-to-differential conversion via Mini-Circuits T1-1T transformers, on-board +5V analog/digital power distribution, and SN74ALVCH16244 buffers isolating 12-bit parallel outputs per channel. Clock input (J4) presents 50Ω impedance and requires low-jitter external source.

Reference configuration is jumper-selectable between internal (default) and external (via J3), with external reference requiring ≥375Ω drive capability. Over-range indicators (OVRA/OVRB) and data-valid flags (DVA/DVB) provide real-time status monitoring synchronized to the ADC's sampling edge.

Key Specifications

Availability

ADS2806-EVM is available at Aetrix Electronics and suitable for high-speed data acquisition, RF receiver prototyping, and ADC characterization applications requiring stable component supply, traceable sourcing, and long-term evaluation platform continuity.

Supply support for ADS2806-EVM 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 headquartered in Dallas, Texas, delivering analog, embedded processing, and high-performance silicon solutions for industrial, automotive, and communications markets.

The ADS2806-EVM belongs to TI's precision data converter evaluation platform family, engineered to accelerate validation of high-speed dual-channel ADCs in undersampling and wideband digitization applications - with emphasis on signal integrity, clock jitter resilience, and dual-channel correlation analysis.

FAQ

What is the primary function of the ADS2806-EVM?

The ADS2806-EVM is an evaluation module built exclusively to characterize the ADS2806 12-bit, 32-MSPS dual-channel analog-to-digital converter. It provides all necessary signal conditioning, power routing, and output buffering to enable accurate measurement of dynamic performance parameters - including SNR, SFDR, and aperture jitter - under real-world clock and input conditions. The ADS2806-EVM does not operate independently; it requires the ADS2806 device to be installed and powered.

Does the ADS2806-EVM support both ADS2806 and ADS2807 devices?

Yes, the ADS2806-EVM is compatible with both the ADS2806 (32-MSPS) and ADS2807 (50-MSPS) devices, as confirmed in TI's SBAU075A documentation. However, full 50-MSPS operation requires verification of signal integrity, clock jitter, and power delivery margins - especially for the clock input (J4) and output buffer timing. The ADS2806-EVM hardware layout and component selection were validated for ADS2806 operation; ADS2807 use is supported but may require external clock optimization.

What are the power supply requirements for the ADS2806-EVM?

The ADS2806-EVM requires four independent DC supplies: +5V for analog circuitry (J1, labeled +5ADUT), +5V for digital core (J1, labeled +5DDUT), +5V for output buffers (J2, labeled +5VD), and +3V for digital output drivers (J2/J7, labeled +3DRVA/+3DRVB). All supplies must be low-noise and well-decoupled; the board provides no onboard regulation or conversion. The ADS2806-EVM uses discrete screw terminals (J1, J2, J7) for each supply domain to minimize coupling.

How is the input signal coupled to the ADS2806 on the ADS2806-EVM?

The ADS2806-EVM uses Mini-Circuits T1-1T broadband RF transformers (T1 and T2) to convert single-ended AC-coupled inputs (applied at J5 and J6) into differential signals suitable for the ADS2806's IN_A/IN_B inputs. This architecture avoids active baluns and preserves wideband amplitude/phase balance. Input range is selected via jumper J1: open for 2V_pp, shorted for 3V_pp. No DC biasing or termination resistors are required at the input connectors.

Can the ADS2806-EVM operate with an external reference, and what are the requirements?

Yes, the ADS2806-EVM supports external reference operation by reconfiguring jumpers JP4–JP8 per TI SBAU075A instructions. External reference voltage must be applied at J3 and capable of driving a 375Ω load - typical of precision voltage references like REF5025 or REF6025. Internal reference remains enabled by default; switching to external mode disables the internal reference and routes the external signal to REFTA/REFBA and REFTB/REFBB pins on the ADS2806. Stability and noise performance depend entirely on the external reference quality.