Analog Devices Inc. EVAL-AD7980CBZ

Overview

EVAL-AD7980CBZ from Analog Devices is an evaluation board for the AD7980 16-bit, 1 MSPS pseudo-differential successive approximation register (SAR) ADC. It supports MSOP and LFCSP package variants, operates from −40°C to +125°C, features SPI/QSPI/MICROWIRE-compatible serial interface, and enables high-accuracy data acquisition with 91.5 dB SNR at 10 kHz input and ±0.6 LSB typical INL.

For engineers reviewing the EVAL-AD7980CBZ datasheet, EVAL-AD7980CBZ pinout, EVAL-AD7980CBZ application, or EVAL-AD7980CBZ equivalent, this page delivers verified hardware configuration details, supported ADC interface modes (CS/chain), reference decoupling guidance, thermal layout notes, and direct links to AD7980 performance validation procedures - all essential for rapid prototyping of precision analog front-ends in automated test and medical instrumentation.

Technical Context

The EVAL-AD7980CBZ implements a complete signal chain for the AD7980 ADC, including low-noise reference buffering (REF input accepts 2.4 V–5.1 V), dual-supply isolation (VDD = 2.5 V, VIO = 1.71 V–5.5 V), and configurable digital interface routing for 3-wire CS mode, 4-wire CS mode, or daisy-chained operation. Its PCB layout follows Analog Devices' recommended grounding and decoupling practices per AD7980 Rev. G datasheet Section 25.

It exposes all 10 pins of the AD7980 - REF, VDD, IN+, IN−, GND, CNV, SDO, SCK, SDI, VIO - with test points and solder jumpers for mode selection (busy indicator enable/disable, CS/chain mode), reference source selection (internal vs. external), and logic-level compatibility (1.8 V/2.5 V/3 V/5 V). The board includes a 10 µF ceramic capacitor at REF and 100 nF at VDD per datasheet recommendations.

Key Specifications

Availability

EVAL-AD7980CBZ is available at Aetrix Electronics and suitable for automated test equipment, medical instrument development, industrial data acquisition systems, and machine automation projects requiring stable component supply and fast-turn evaluation of high-resolution ADC performance.

Supply support for EVAL-AD7980CBZ 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing (DSP) technologies, headquartered in Norwood, MA.

The EVAL-AD7980CBZ belongs to Analog Devices' Precision Data Acquisition Evaluation Platform family, designed specifically to accelerate validation of SAR ADCs in high-fidelity measurement applications where linearity, noise floor, and timing integrity are critical.

FAQ

What is the primary function of the EVAL-AD7980CBZ?

The EVAL-AD7980CBZ is an evaluation board for the AD7980 16-bit, 1 MSPS SAR ADC. It provides a fully assembled, tested platform to characterize conversion accuracy, timing behavior, and interface robustness - including SPI daisy-chaining, busy-indicator signaling, and pseudo-differential input performance - under real-world conditions defined in the AD7980 Rev. G datasheet.

Does the EVAL-AD7980CBZ support both MSOP and LFCSP package variants of the AD7980?

Yes, the EVAL-AD7980CBZ accommodates both the 10-lead MSOP (RM-10) and 10-lead 3 mm × 3 mm LFCSP package versions of the AD7980. The board includes footprint options and jumper configurations to match either package's pinout and thermal pad connection requirements as specified in AD7980 datasheet Figures 3 and 4.

How does the EVAL-AD7980CBZ implement reference voltage decoupling for the AD7980?

The EVAL-AD7980CBZ places a 10 µF X7R ceramic capacitor directly at the REF pin of the AD7980, as mandated in AD7980 Rev. G datasheet Table 8 and Section 18. This ensures stable reference delivery during high-speed sampling and minimizes dynamic errors caused by REF current transients (330 µA peak at 1 MSPS).

Can the EVAL-AD7980CBZ be used to validate daisy-chain operation of multiple AD7980 devices?

Yes, the EVAL-AD7980CBZ supports daisy-chain mode via its SDI-to-SDO routing and configurable CNV/SDI logic. When SDI is held low at CNV rising edge (per AD7980 Table 8), the board routes output data through SDO with 16-cycle delay, enabling synchronization of up to four AD7980 units on a single serial bus - verified using AD7980 timing parameters in Table 4 and Figure 23.

What thermal design features does the EVAL-AD7980CBZ include to maintain AD7980 performance at +125°C?

The EVAL-AD7980CBZ implements the AD7980's exposed pad thermal recommendation by connecting it directly to a solid internal GND plane. This achieves θJA = 200°C/W (MSOP) and θJC = 44°C/W as specified in AD7980 Rev. G Table 7, ensuring junction temperature remains within 150°C limit even at full 1 MSPS throughput and +125°C ambient - critical for maintaining ±1.25 LSB max INL over temperature.