Analog Devices Inc. EVAL-AD1871EBZ

Overview

EVAL-AD1871EBZ from Analog Devices is an evaluation board for the AD1871 stereo 24-bit, 96 kHz audio ADC. It enables rapid prototyping of high-fidelity digital audio acquisition systems with verified analog input conditioning, multibit sigma-delta conversion, and flexible serial interface configuration. The board supports I²S, left/right-justified, and DSP modes, and is used in professional audio mixer development and high-resolution recorder reference designs.

For engineers reviewing the EVAL-AD1871EBZ datasheet, EVAL-AD1871EBZ pinout, EVAL-AD1871EBZ application, or EVAL-AD1871EBZ equivalent, this page provides verified functional context, interface timing validation, power supply layout guidance, cascading topology verification, and direct integration notes for AD1871-based audio subsystems.

Technical Context

The EVAL-AD1871EBZ implements a complete signal chain for the AD1871 IC: dual-channel differential analog front-end with programmable gain amplifiers (0–12 dB), external RC filter networks for modulator inputs (CAPLP/CAPLN/CAPRP/CAPRN), and configurable clocking via MCLK, BCLK, LRCLK, and CCLK. It routes all 28 pins of the AD1871YRS SSOP package to test points and headers.

Board-level features include on-board 5 V/3.3 V regulation (AVDD, DVDD, ODVDD), isolated analog/digital ground planes, low-noise reference decoupling (VREF + 10 µF || 0.1 µF), and jumper-selectable master/slave and data format modes (DF0/DF1). Reset and cascade control are accessible via headers for system-level synchronization.

Key Specifications

Availability

EVAL-AD1871EBZ is available at Aetrix Electronics and suitable for professional audio equipment development, studio-grade ADC subsystem validation, and automotive infotainment audio front-end qualification requiring stable component supply and full-spectrum performance verification.

Supply support for EVAL-AD1871EBZ 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 semiconductors, headquartered in Wilmington, MA.

The EVAL-AD1871EBZ belongs to Analog Devices' Audio Evaluation Platform family, designed specifically to accelerate design-in of high-dynamic-range audio converters in recording, broadcast, and automotive applications.

FAQ

What is the primary function of the EVAL-AD1871EBZ?

The EVAL-AD1871EBZ is an evaluation board for the AD1871 stereo 24-bit, 96 kHz audio ADC. It provides a fully assembled, tested platform to validate analog input performance, digital interface timing, cascading capability, and power integrity of the AD1871YRS IC in real-world audio acquisition systems. The EVAL-AD1871EBZ does not contain its own processor or firmware-it serves exclusively as a hardware reference for the AD1871 device.

Does the EVAL-AD1871EBZ support cascading multiple AD1871 devices?

Yes, the EVAL-AD1871EBZ supports cascading up to four AD1871 devices via the CASC pin (Pin 21) and DIN/DOUT routing. The board exposes the CASC signal and includes header access to DIN (Pin 25), DOUT (Pin 26), BCLK (Pin 27), and LRCLK (Pin 28), enabling validation of multi-ADC synchronization and time-division multiplexing on a single DSP serial port-exactly as specified for the AD1871 IC.

Can the EVAL-AD1871EBZ operate with both 3.3 V and 5 V digital interfaces?

Yes, the EVAL-AD1871EBZ supports dual-voltage digital I/O. Its ODVDD rail is configurable for either 3.3 V or 5 V operation using onboard jumpers, matching the AD1871's 3.3 V-tolerant digital interface specification. This allows direct connection to 3.3 V DSPs or FPGAs without level-shifting, while maintaining full compatibility with the AD1871's DVDD (5 V) and AVDD (5 V) requirements.

How is analog input configured on the EVAL-AD1871EBZ?

The EVAL-AD1871EBZ supports both differential and single-ended analog inputs per channel, consistent with the AD1871's internal MUX/PGA architecture. Jumpers select between VINLP/VINLN (differential left) and VINRP/VINRN (differential right), with optional external RC filter pads (CAPLP/CAPLN/CAPRP/CAPRN) for modulator input stabilization. Input gain (0–12 dB in 3 dB steps) is controlled via the AD1871's SPI registers-not hardware jumpers-so configuration requires host software interaction with the EVAL-AD1871EBZ.

Is the EVAL-AD1871EBZ compatible with standard audio test equipment?

Yes, the EVAL-AD1871EBZ includes SMA connectors for analog input (left/right differential pairs) and test points for BCLK, LRCLK, DOUT, and MCLK, enabling direct connection to audio analyzers (e.g., Audio Precision APx500), oscilloscopes, and logic analyzers. All critical timing parameters-including tBDLY, tBCH, tBLDLY, and tCOE-are preserved per AD1871 datasheet specifications, ensuring measurement validity for THD+N, dynamic range, and group delay characterization of the AD1871 IC.