Texas Instruments ADC102S021EVAL

Overview

ADC102S021EVAL from National Semiconductor is an evaluation board designed to accelerate characterization and integration of the ADC102S021 - a 10-bit, dual-channel, serial-output SAR analog-to-digital converter with internal input multiplexer and 200 kSPS sampling rate. It supports coherent sampling, dynamic performance analysis (SNR, SINAD, THD, SFDR, ENOB), and flexible analog signal conditioning for precision ADC validation.

For engineers reviewing the ADC102S021EVAL datasheet, ADC102S021EVAL pinout, ADC102S021EVAL application, or ADC102S021EVAL equivalent, this board enables rapid functional verification, clock stability testing, reference voltage sweep, AC/DC-coupled input biasing, and FFT-based spectral analysis of the ADC102S021 under real-world signal conditions.

Technical Context

The ADC102S021EVAL interfaces directly with the ADC102S021 in MSOP-8 package, providing configurable analog input paths (BNC1/BNC2), adjustable DUT supply (2.7V–5.0V at TP1), user-tunable input offset (VR2), and selectable clock sources (on-board 8 MHz oscillator at Y1 or external via BNC3). It routes digital signals through LA1 (logic analyzer header) and J2 (FutureBus connector) for WaveVision4 capture.

Signal integrity is maintained via 50 Ω input impedance, bandpass-filter-ready analog inputs, d.c./a.c. coupling jumpers (JP1/JP3), channel-select configuration (JP2/JP4), and dedicated test points (TP1–TP8) for real-time probing of supply, clock, CS#, DIN, DOUT, and SCLK. Power is supplied as +5.5V to +5.7V @ 15 mA at P1.

Key Specifications

Availability

ADC102S021EVAL is available at Aetrix Electronics and suitable for precision data acquisition system development, ADC dynamic performance validation, mixed-signal test bench setup, and embedded sensor interface prototyping requiring stable component supply and documented reference design support.

Supply support for ADC102S021EVAL 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 ADC/DAC characterization.

The ADC102S021EVAL belongs to National's ADCxx2Sxx1 family evaluation platform series, designed specifically to streamline evaluation of 8-/10-/12-bit dual-channel SAR ADCs with integrated MUX, targeting instrumentation, industrial sensing, and communications test equipment.

FAQ

What is the primary function of the ADC102S021EVAL evaluation board?

The ADC102S021EVAL evaluation board is a hardware platform built to evaluate the ADC102S021 - a 10-bit, dual-input, serial-output SAR ADC. It provides signal conditioning, programmable power and bias control, clock flexibility, and digital interface routing to enable accurate dynamic performance measurement (e.g., SNR, SINAD, THD) and functional validation of the ADC102S021 in real circuit conditions.

Which ADC device does the ADC102S021EVAL board support?

The ADC102S021EVAL board is configured for the ADC102S021 - a 10-bit, 200 kSPS, dual-channel SAR ADC in MSOP-8 package with internal 2:1 multiplexer and SPI-compatible serial interface. The board's top-mark "X17C" and schematic U3 placement confirm this specific variant; it is not interchangeable with ADC102S101 or ADC102S051 without hardware revision.

How is the ADC102S021 powered and referenced on the ADC102S021EVAL board?

On the ADC102S021EVAL board, the ADC102S021 receives its analog supply (V_A) from TP1, adjustable between +2.7V and +5.0V using potentiometer VR1. Since the ADC102S021 uses its V_A pin as the reference voltage (V_REF), this adjustment directly sets the full-scale input range. The board derives V_A from the main +5.5V supply via regulation and filtering, ensuring low-noise operation critical for ENOB validation.

Can the ADC102S021EVAL board be used without the WaveVision4 Capture Board?

Yes - the ADC102S021EVAL board supports standalone operation. Digital outputs (CS#, SCLK, DIN, DOUT) are accessible at LA1 header pins and FutureBus J2, allowing connection to any logic analyzer or custom host controller. Analog inputs (BNC1/BNC2), clock selection (JP6), and supply/bias controls (VR1/VR2) remain fully functional independent of WaveVision4, enabling protocol-level debugging and custom firmware validation of the ADC102S021.

What are the supported clock sources for the ADC102S021 on this evaluation board?

The ADC102S021 on the ADC102S021EVAL board accepts clock input from two sources: an on-board 8 MHz TTL oscillator mounted at Y1 (through-hole), or an external clock generator connected to BNC3. JP6 selects between them - shorting pins 1–2 enables Y1; shorting pins 2–3 routes BNC3. The board supports clock frequencies from 1 MHz to 20 MHz, matching the ADC102S021's specified operating range and enabling variable sample rate testing.