Texas Instruments ADS7888EVM

Overview

ADS7888EVM from Texas Instruments is an evaluation module designed to assess the ADS7888SDBVT - an 8-bit, 1.25-MSPS, single-channel SAR analog-to-digital converter in SOT23-6 and SC-70 packages. It supports analog input ranges up to 5.25 V, operates from –40°C to +125°C, and features onboard signal conditioning with THS4031 amplifier and REF3225 reference.

For engineers reviewing the ADS7888EVM datasheet, ADS7888EVM pinout, ADS7888EVM application, or ADS7888EVM equivalent, this module serves as a reference design, prototype platform, and software test interface for high-speed serial ADC integration with TMS320C5000/C6000 DSPs and FPGA-based systems.

Technical Context

The ADS7888EVM implements a complete analog front-end with THS4031 unity-gain inverting buffer, 680-pF C0G ceramic input filter capacitor, and REF3225 2.5-V precision reference. Power is configurable via jumpers W1–W4 for ±6-V amplifier supplies, 3.3-V/5-V digital buffers, and ADC VDD sourcing from either system rail or onboard reference.

Digital interfacing uses Samtec P1/P2 dual-row headers supporting CS, SCLK, FS, and SDO signals per Table 4. Level translation is provided by SN74LVC1G07 open-drain buffer (U6), accommodating host logic levels from 1.8 V to 5 V while maintaining compatibility with the ADS7888's 2.35–5.25-V supply range and 5.25-V-tolerant digital inputs.

Key Specifications

Availability

ADS7888EVM is available at Aetrix Electronics and suitable for high-speed data acquisition, embedded sensor interface, and DSP/FPGA ADC integration requiring stable component supply and full technical documentation support.

Supply support for ADS7888EVM 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 connectivity solutions for industrial, automotive, and communications markets.

The ADS7888EVM belongs to TI's precision data converter evaluation platform family, engineered to accelerate development of high-speed, low-power ADC applications in portable and harsh-environment systems.

FAQ

What is the primary function of the ADS7888EVM?

The ADS7888EVM is an evaluation module specifically built to characterize and validate the ADS7888SDBVT - an 8-bit, 1.25-MSPS SAR ADC. It provides full analog signal conditioning, reference, power configuration, and digital interface access, enabling rapid prototyping and performance verification without custom PCB design. The ADS7888EVM supports both hardware and software-level evaluation of the ADS7888 device in real-world signal chains.

Which ADC does the ADS7888EVM evaluate?

The ADS7888EVM evaluates the ADS7888SDBVT, a 6-pin SOT23-6 or SC-70 packaged 8-bit, 1.25-MSPS serial-interface SAR ADC. As confirmed in the SLAU166B User's Guide, item 29 on the ADS7888EVM board is explicitly populated with the ADS7888SDBVT device. This part operates from 2.35 V to 5.25 V and is rated for –40°C to +125°C operation.

Can the ADS7888EVM be used with 1.8-V microcontrollers?

Yes - the ADS7888EVM includes an SN74LVC1G07 level-shifting buffer (U6) that drives SDO to 1.8-V logic levels. Since the ADS7888 itself outputs high at VDD – 0.2 V, the EVM's buffer ensures compatibility when interfacing with low-voltage hosts. Configuration requires verifying jumper W4 and W2 settings per Table 3 and confirming host input thresholds against the buffered SDO output on P2.13.

Does the ADS7888EVM support external reference input?

Yes - the ADS7888EVM provides EXT_REF at P1.20, allowing connection of an external reference voltage to replace the onboard REF3225. When using external reference, jumper W3 must be configured to route user-applied voltage to the ADC reference pin, and W4 adjusted to decouple ADC VDD from the reference path. This enables evaluation under custom reference conditions matching final system requirements.

How is analog input signal conditioning implemented on the ADS7888EVM?

The ADS7888EVM uses a THS4031 high-speed op-amp configured as a unity-gain inverting buffer (U4), with 300-Ω series resistors (R20/R24) and a 680-pF C0G ceramic capacitor (C20) at the ADC input. This network minimizes distortion, filters kickback noise, and maintains charge reservoir behavior during sample/hold transitions - directly supporting the ADS7888's AC performance specifications including SNR and THD as documented in SLAS468.