Texas Instruments ADC122S706EB/NOPB

Overview

ADC122S706EB/NOPB from National Semiconductor is an evaluation board designed exclusively for the ADC122S706 dual 12-bit, simultaneous-sampling analog-to-digital converter. It supports sampling rates from 500 kSPS to 1 MSPS, features SPI digital interface with DUAL/single-output mode selection, and provides differential analog inputs (±VREF) for two independent channels. The board enables performance validation in test equipment or PC-based WaveVision 4 environments.

For engineers reviewing the ADC122S706EB/NOPB datasheet, ADC122S706EB/NOPB pinout, ADC122S706EB/NOPB application, or ADC122S706EB/NOPB equivalent, this evaluation board delivers verified dynamic metrics - including SINAD of 72.1 dB, SNR of 72.5 dB, THD of –82.8 dBc, SFDR of 83.8 dBc, and ENOB of 11.7 bits - under 2.5 V reference and 4.9 V_PP input conditions.

Technical Context

The ADC122S706EB/NOPB implements a complete hardware platform for evaluating the ADC122S706 IC, which integrates dual 12-bit SAR converters with simultaneous sampling, on-chip reference options, and configurable SPI output (dual- or single-line). Its analog front-end supports DC- or AC-coupled differential inputs via J1 (6-pin header), with user-selectable termination (R7/R15) and biasing (R1–R14).

Digital control is managed through five configuration jumpers (JP1–JP7): JP1 selects VREF source (2.5 V regulator or VA); JP5 configures DOUTA/DOUTB output routing; JP6 chooses VA supply source (external or WV4 board); JP7 switches between onboard 16 MHz crystal (Y1) or external clock at TP9; JP2 enables digital supply coupling. All signals are accessible via test points (TP1–TP10), vias (VIA1–VIA4), and the 14-pin J2 header for WV4 integration.

Key Specifications

Availability

ADC122S706EB/NOPB is available at Aetrix Electronics and suitable for high-fidelity data acquisition, mixed-signal test equipment development, and sensor signal conditioning requiring stable component supply and traceable evaluation hardware.

Supply support for ADC122S706EB/NOPB 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

National Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by Texas Instruments in 2011. Its legacy evaluation platforms remain widely used for design-in validation.

The ADC122S706EB/NOPB belongs to National Semiconductor's precision ADC evaluation kit family, engineered to accelerate prototyping and characterization of dual-channel, simultaneous-sampling converters in industrial and test instrumentation applications.

FAQ

What is the primary function of the ADC122S706EB/NOPB?

The ADC122S706EB/NOPB is a dedicated evaluation board for the ADC122S706 dual 12-bit simultaneous-sampling analog-to-digital converter. It provides all necessary circuitry - including reference regulation, clock generation, SPI interface access, and configurable analog input paths - to validate the ADC122S706EB/NOPB's performance under real-world conditions using either standalone test equipment or WaveVision 4 software.

Does the ADC122S706EB/NOPB support both DC- and AC-coupled analog inputs?

Yes, the ADC122S706EB/NOPB supports both configurations. It ships pre-configured for DC-coupled differential inputs via J1. For AC coupling, users must populate C6/C7/C10/C11 (1 µF), R1–R5/R9/R12/R14 (4.99 kΩ), and remove R6/R11/R13/R17 (20 Ω), as documented in Section 2.0 of the User's Guide. This enables VA/2 DC biasing for full-scale swing around ground.

Which software is required to operate the ADC122S706EB/NOPB in computer mode?

WaveVision 4 software version 4.4 or higher is required to operate the ADC122S706EB/NOPB in computer mode with the Data Capture Board (WV4). The software performs real-time data acquisition, FFT analysis (yielding SINAD, SNR, THD, SFDR, ENOB), histogram generation, and waveform visualization - all validated specifically for the ADC122S706EB/NOPB signal chain.

Can the ADC122S706EB/NOPB be powered directly from the WV4 board?

Yes, the ADC122S706EB/NOPB can be powered from the WV4 board by placing a shorting jumper across pins 2 & 3 of JP6. However, the User's Guide explicitly recommends using an external +5.0 V supply (via TP6) for best performance, as it minimizes noise coupling and ensures stable VA rail for the ADC122S706EB/NOPB's analog section.

What clock sources does the ADC122S706EB/NOPB support?

The ADC122S706EB/NOPB supports two clock sources: an onboard 16 MHz crystal oscillator (Y1), selected by shorting pins 1 & 2 of JP7; or an external clock applied to TP9 (CLK_IN), selected by shorting pins 2 & 3 of JP7. The board includes 51 Ω termination (R22) at TP9 and advises removing Y1 when using external clock to avoid noise injection into the ADC122S706EB/NOPB's conversion process.