Analog Devices Inc. EVAL-AD7656-1CBZ

Overview

EVAL-AD7656-1CBZ from Analog Devices is an evaluation board for the AD7656-1 6-channel, 250 kSPS, 16-bit simultaneous-sampling SAR ADC with true bipolar ±10 V/±5 V input ranges, on-chip 2.5 V reference, and parallel/serial/daisy-chain interface - used in power line monitoring and multiaxis control systems.

For engineers reviewing the EVAL-AD7656-1CBZ datasheet, EVAL-AD7656-1CBZ pinout, EVAL-AD7656-1CBZ application, or EVAL-AD7656-1CBZ equivalent, this page delivers verified board-level specifications, interface configuration options, signal integrity layout guidance, and direct compatibility notes with the AD7656-1 IC it evaluates.

Technical Context

The EVAL-AD7656-1CBZ implements a complete, ready-to-run hardware platform for evaluating the AD7656-1 ADC under real-world conditions: it provides regulated ±15 V analog supplies (VDD/VSS), 5 V digital rails (AVCC/DVCC/VDRIVE), decoupled reference capacitor networks (REFCAPA/B/C), and configurable CONVST timing via on-board jumpers or external triggers.

It supports all three interface modes - high-speed parallel (16-bit data bus + RD/WR/CS/BUSY), SPI-compatible serial (SCLK/DOUT A–C), and daisy-chain - with selectable H/S SEL, SER/PAR SEL, and RANGE logic levels via DIP switches and solder bridges, enabling validation of timing margins, channel isolation (>100 dB), and SNR (88 dB at 10 kHz) per the AD7656-1 specification.

Key Specifications

Availability

EVAL-AD7656-1CBZ is available at Aetrix Electronics and suitable for power line monitoring, instrumentation and control systems, and multiaxis positioning systems requiring stable component supply and rapid ADC performance validation.

Supply support for EVAL-AD7656-1CBZ 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 Norwood, MA, serving industrial, automotive, communications, and healthcare markets.

The EVAL-AD7656-1CBZ belongs to Analog Devices' precision data acquisition evaluation platform family, designed to accelerate development of high-fidelity, multi-channel measurement systems using their iCMOS-based simultaneous-sampling ADCs.

FAQ

What is the primary function of the EVAL-AD7656-1CBZ?

The EVAL-AD7656-1CBZ is an evaluation board specifically configured to demonstrate and validate the full performance of the AD7656-1 6-channel, 250 kSPS, 16-bit simultaneous-sampling ADC. It provides all necessary power regulation, reference buffering, interface routing, and signal conditioning to measure key parameters including SNR (88 dB), channel-to-channel isolation (>100 dB), and timing accuracy per the AD7656-1 datasheet - without requiring custom PCB design.

Does the EVAL-AD7656-1CBZ support daisy-chain configuration for multiple AD7656-1 devices?

Yes, the EVAL-AD7656-1CBZ supports daisy-chain operation via its configurable SER/PAR SEL and DCEN pins, allowing up to four AD7656-1 devices to share a single serial interface (SCLK, CS, DOUTx). The board includes header pins and jumper options to route DOUT A/B/C outputs and enable DCEN, matching the daisy-chain timing requirements specified in the AD7656-1 datasheet (Rev. D, Section 27).

Can the EVAL-AD7656-1CBZ be used to evaluate both ±10 V and ±5 V input ranges of the AD7656-1?

Yes, the EVAL-AD7656-1CBZ supports both ±10 V and ±5 V analog input ranges through hardware configuration: the RANGE pin is accessible via a solder jumper or DIP switch, directly mapping to the AD7656-1's pin-selectable range mode (±4 × VREF or ±2 × VREF). The board's analog input connectors and protection circuitry are rated for ±15 V, ensuring safe operation across both ranges.

What power supplies are required to operate the EVAL-AD7656-1CBZ?

The EVAL-AD7656-1CBZ requires three independent power sources: ±15 V (for VDD/VSS analog supplies), +5 V (for AVCC, DVCC, and VDRIVE digital/logic rails), and a clean ground reference. On-board regulators and filtering ensure compliance with AD7656-1 absolute maximum ratings (e.g., VDD = 10–16.5 V, VSS = −10 to −16.5 V) and noise-sensitive analog performance targets (e.g., 88 dB SNR).

Is the EVAL-AD7656-1CBZ compatible with the AD7657-1 and AD7658-1 ICs?

No - the EVAL-AD7656-1CBZ is optimized for the AD7656-1 (16-bit resolution) and is not fully compatible with the AD7657-1 (14-bit) or AD7658-1 (12-bit), due to differences in DC accuracy, dynamic performance (e.g., SINAD drops to 82.5 dB and 73.5 dB respectively), and internal calibration architecture. While pinout and interface logic are identical, evaluation results for non-AD7656-1 variants require separate characterization per their respective datasheet tables.