Texas Instruments ADS7887EVM

Overview

ADS7887EVM from Texas Instruments is an evaluation module designed specifically for the ADS7887 - a 10-bit, 1.25-MSPS, single-channel, serial-interface SAR ADC in SOT23-6 and SC-70 packages. It provides full analog signal conditioning with THS4031 buffer, onboard 2.5-V reference (REF3225), dual ±6-V amplifier supply support, and configurable digital interface via 20-pin Samtec P1/P2 headers.

For engineers reviewing the ADS7887EVM datasheet, ADS7887EVM pinout, ADS7887EVM application, or ADS7887EVM equivalent, this board serves as a reference design, prototype platform, and software test environment for high-speed ADC integration - especially with TMS320C5000/C6000 DSP starter kits using the 5-6K interface card.

Technical Context

The ADS7887EVM implements a complete analog front-end with inverting unity-gain THS4031 buffer, 680-pF C0G input filter capacitor, and selectable reference sourcing (onboard REF3225 or external). Its analog input accepts signals up to 2.35–5.25 VPP depending on VDD, and supports both SMA and 20-pin header (P1) connections.

Digital interfacing uses chip select (CS), serial clock (SCLK), frame sync (FS), and serial data out (SDO) routed to P2 - compatible with 1.8-V to 5-V logic via level-shifting SN74LVC1G07 buffer. Power is supplied via test points (TP1–TP4) or 10-pin J2 connector, supporting independent ±6-V analog amplifier rails, +5-V ADC/reference rail, and +3.3-V/+5-V digital buffer rail.

Key Specifications

Availability

ADS7887EVM is available at Aetrix Electronics and suitable for high-speed data acquisition, DSP-based signal processing, and embedded sensor interface development requiring stable component supply and rapid ADC evaluation capability.

Supply support for ADS7887EVM 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, specializing in analog, embedded processing, and high-performance silicon solutions for industrial, automotive, and communications markets.

The ADS7887EVM belongs to TI's precision data converter evaluation platform family, engineered to accelerate validation of high-speed SAR ADCs in real-world signal chains - emphasizing layout integrity, noise control, and interoperability with TI's DSP ecosystem.

FAQ

What is the primary function of the ADS7887EVM?

The ADS7887EVM is a dedicated evaluation module for the ADS7887 10-bit, 1.25-MSPS serial-interface SAR ADC. It enables full characterization of the device's ac performance (SNR, THD), dc accuracy, timing behavior, and system-level integration - including analog signal conditioning, reference selection, and digital interface verification. ADS7887EVM supports rapid prototyping and software testing with TI DSP platforms.

Which ADC does the ADS7887EVM evaluate, and what are its key electrical specs?

The ADS7887EVM evaluates the ADS7887 - a 10-bit, 1.25-MSPS, single-channel SAR ADC operating from 2.35 V to 5.25 V supply, specified from –40°C to +125°C, and offered in SOT23-6 and SC-70 packages. Its digital inputs tolerate up to 5.25 V regardless of VDD, enabling mixed-voltage system interfacing. ADS7887EVM validates these exact specifications under real-world layout and power conditions.

Does the ADS7887EVM include signal conditioning and reference circuitry?

Yes. The ADS7887EVM integrates a THS4031 high-speed op-amp configured as a unity-gain inverting buffer, a 680-pF C0G ceramic input filter capacitor, and a REF3225AIDBVT 2.5-V precision voltage reference. Users may also apply an external reference via P1.20 (EXT_REF). These components collectively ensure optimal dynamic performance and stable conversion accuracy for the ADS7887 during evaluation.

How is digital communication handled on the ADS7887EVM?

Digital signals - CS, SCLK, FS, and SDO - are accessible via the 20-pin P2 header (Table 4 in SLAU166B). An SN74LVC1G07 level-shifter buffers SDO for compatibility with 1.8-V to 5-V host logic. CS can be sourced from P2.1 or P2.7 (via jumper W1), and the board supports direct connection to TI's 5-6K interface card for seamless integration with TMS320C5000/C6000 DSK platforms. ADS7887EVM maintains strict timing alignment per ADS7887's serial protocol.

Can the ADS7887EVM be used as a reference design for custom PCB layout?

Yes. The ADS7887EVM features a documented 4-layer layout (Layers 1–4 shown in SLAU166B), with dedicated ground and power planes, controlled-impedance routing for critical analog paths, and physical separation between analog and digital sections. Schematics, bill of materials (Table 7), and layout drawings are provided to guide proper decoupling, grounding, and signal integrity practices when integrating the ADS7887 into production systems. ADS7887EVM serves explicitly as a layout reference per TI's User's Guide.