Texas Instruments ADS7885EVM

Overview

ADS7885EVM from Texas Instruments is an evaluation module designed specifically for the ADS7885SDBVT - an 8-bit, 3-MSPS, single-channel, serial-interface SAR ADC in SOT23-6 packaging. It provides full analog signal conditioning (THS4031 buffer), onboard 2.5-V reference (REF3225), dual ±6-V amplifier supplies, and configurable digital interface via Samtec P1/P2 headers. The board supports ADC evaluation as a reference design, prototype platform, and software test environment for high-speed data acquisition systems.

For engineers reviewing the ADS7885EVM datasheet, ADS7885EVM pinout, ADS7885EVM application, or ADS7885EVM equivalent, this page delivers verified technical context, power supply configuration options (±6 V, +5 V, +3.3 V), jumper-controlled reference and supply selection (W1–W4, SJP1/SJP2), analog input routing (SMA J1 or P1.2), and serial control interface mapping (CS, SCLK, FS, SDO) per Table 4 of SLAU166B.

Technical Context

The ADS7885EVM implements a complete analog front-end with THS4031 unity-gain inverting buffer optimized for 100-kHz signals, 680-pF C0G input filter capacitor (C20), and REF3225AIDBVT precision 2.5-V reference. Signal path uses low-distortion polypropylene or C0G capacitors to preserve SNR/THD performance per ADS7885 device specifications.

Digital interfacing is supported through 20-pin dual-row Samtec headers (P1, P2), with CS, SCLK, FS, and SDO routed explicitly per Table 4. Level translation is provided by SN74LVC1G07DBVR buffer (U6) to accommodate host logic voltage mismatches - e.g., when ADS7885 operates at 2.35–5.25 V while host runs at 1.8 V.

Key Specifications

Availability

ADS7885EVM is available at Aetrix Electronics and suitable for high-speed ADC evaluation, analog front-end prototyping, and DSP-based software validation requiring stable component supply and documented reference design fidelity.

Supply support for ADS7885EVM 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 analog products for industrial, automotive, and communications markets.

The ADS7885EVM belongs to TI's precision data converter evaluation platform family, engineered to accelerate development of high-speed, low-power ADC applications - particularly where signal integrity, reference stability, and flexible digital interfacing are critical.

FAQ

What is the primary function of the ADS7885EVM?

The ADS7885EVM is a dedicated evaluation module for the ADS7885SDBVT 8-bit, 3-MSPS SAR ADC. It enables full characterization of the device's analog performance (SNR, THD), digital interface timing, and system integration behavior - including signal conditioning, reference selection, and level translation - without requiring custom PCB design. ADS7885EVM is not a standalone product but a validated test platform supporting rapid ADC validation.

Which ADC device does the ADS7885EVM evaluate?

The ADS7885EVM evaluates the ADS7885SDBVT - an 8-bit, 3-MSPS, serial-interface SAR ADC in 6-pin SOT23-6 packaging. Per SLAU166B Section 7 BOM and the exact identity context, item 29 on the ADS7885EVM board is populated with the ADS7885SDBVT device. This is distinct from other variants (e.g., ADS7883/ADS7884) evaluated by sibling EVMs in the same family.

How is the reference voltage configured on the ADS7885EVM?

The ADS7885EVM offers two reference options: (1) onboard 2.5-V REF3225AIDBVT (U3), enabled by installing W3 pins 1–2; or (2) user-applied external reference, selected by installing W3 pins 2–3. The reference feeds both the ADS7885SDBVT and the THS4031 buffer circuit. Reference decoupling uses 1-µF and 10-nF capacitors per TI layout guidelines in SLAU166B Section 3.2.

What power supplies are required to operate the ADS7885EVM?

The ADS7885EVM requires three independent supplies: ±6 V DC for the THS4031 op-amps (applied at TP1/TP2 or J2 pins 1/2), +5 V DC for the analog section (TP4 or J2 pin 3), and +3.3 V or +5 V DC for digital buffers (TP3 or J2 pins 9/10, selected via W1 jumper). All supplies must be low-noise and well-decoupled per SLAU166B Section 5.

Can the ADS7885EVM interface directly with a 1.8-V microcontroller?

Yes - but only with level translation enabled. The ADS7885SDBVT outputs logic levels of 0.4 V (low) and VDD – 0.2 V (high), which may exceed 1.8-V host input thresholds. The ADS7885EVM includes SN74LVC1G07DBVR (U6) as a configurable open-drain buffer; when enabled (OE high), it translates ADS7885 SDO to 1.8-V–compatible levels. Configuration requires verifying U6 enable logic and host-side pull-up placement per SLAU166B Section 4.