Analog Devices Inc. EVAL-AD7656-1SDZ

Overview

EVAL-AD7656-1SDZ from Analog Devices is a full-featured evaluation board designed to characterize the AD7656-1 16-bit, 6-channel, 250 kSPS simultaneous-sampling SAR ADC under SDP-controlled or standalone operation. It integrates on-board ±15 V op amp supplies, 2.5 V reference (AD780), 3.3 V logic rail, and parallel interface connectivity via EVAL-SDP-CB1Z. Used for precision data acquisition validation in industrial instrumentation and power quality monitoring.

For engineers reviewing the EVAL-AD7656-1SDZ datasheet, EVAL-AD7656-1SDZ pinout, EVAL-AD7656-1SDZ application, or EVAL-AD7656-1SDZ equivalent, this page delivers verified hardware configuration options, jumper-default settings per UG-417 Rev. 0, SDP interface timing constraints, on-board power architecture, and software-controlled test modes including FFT, histogram, and time-domain waveform analysis.

Technical Context

The EVAL-AD7656-1SDZ implements a dual-mode architecture: SDP-controlled mode uses USB-connected EVAL-SDP-CB1Z for parallel bus communication (WR, RD, CS, BUSY, DB0–DB15), while standalone mode requires external sourcing of AVCC (4.75–5.25 V), DVCC (4.75–5.25 V), VDD (+12 to +16.5 V), and VSS (−12 to −16.5 V). Default link positions (Table 3) configure it for parallel interface, 2.5 V AD780 reference, unbuffered VREF, and software-controlled CONVST A/B/C.

On-board power generation includes ADP2301 (1.2 A buck), ADP1613 (±15 V boost), ADP3303-5 (200 mA LDO), and ADM1185 sequencing. Signal conditioning uses six AD8597 op amps with selectable buffering (SL15–SL20) and R-C anti-aliasing filters before the AD7656-1 inputs. Reference selection is switchable between AD780 (2.5 V) and ADR431 (XFET).

Key Specifications

Availability

EVAL-AD7656-1SDZ is available at Aetrix Electronics and suitable for industrial instrumentation, power quality analyzers, and motor control feedback systems requiring stable component supply and rapid ADC performance validation.

Supply support for EVAL-AD7656-1SDZ 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control applications.

The EVAL-AD7656-1SDZ belongs to Analog Devices' precision ADC evaluation platform family, engineered to accelerate development of high-fidelity data acquisition systems using iCMOS-based simultaneous-sampling converters.

FAQ

What is the primary function of the EVAL-AD7656-1SDZ evaluation board?

The EVAL-AD7656-1SDZ is a dedicated hardware platform for evaluating the AD7656-1 16-bit, 6-channel, 250 kSPS simultaneous-sampling ADC. It provides complete signal conditioning, reference selection, power generation, and interface logic-enabling engineers to validate dynamic performance (SNR, THD, SFDR), timing behavior, and system-level integration without custom PCB design. The EVAL-AD7656-1SDZ supports both PC-controlled operation via EVAL-SDP-CB1Z and external standalone use.

Which ADC does the EVAL-AD7656-1SDZ specifically target?

The EVAL-AD7656-1SDZ is configured exclusively for the AD7656-1 - a pin- and software-compatible variant of the AD7656 featuring reduced decoupling requirements and optimized iCMOS process implementation. It is not intended for direct use with AD7657-1 or AD7658-1 without reconfiguration, as those devices differ in resolution (14-/12-bit) and internal register mapping. All documentation, default jumper settings (Table 3), and software are validated for AD7656-1 operation.

How is the EVAL-AD7656-1SDZ powered in SDP-controlled mode?

In SDP-controlled mode, the EVAL-AD7656-1SDZ receives 7–9 V DC via connector J702. This input powers the on-board ADP1613 (generating ±15 V for op amps), ADP2301 (generating +5 V), ADP3303-5 (generating +3.3 V), and ADM1185 sequencer - which in turn supplies AVCC, DVCC, VDD, VSS, and VDRIVE to the AD7656-1 and supporting circuitry. No external supplies are required beyond the 9 V adapter when used with EVAL-SDP-CB1Z.

What reference voltage options are available on the EVAL-AD7656-1SDZ?

The EVAL-AD7656-1SDZ offers two factory-installed reference sources: AD780 (2.5 V or 3.0 V, selected by LK21 position) and ADR431 (ultralow-noise XFET). Default configuration (LK13 = A, LK21 = removed) selects AD780 at 2.5 V. Users may switch to ADR431 via LK13 = B or apply an external reference through REFCAPA/REFCAPB/REFCAPC (SL1/SL2 configurable). Internal ADC reference is also supported but not enabled by default.

Does the EVAL-AD7656-1SDZ support standalone operation without the EVAL-SDP-CB1Z?

Yes, the EVAL-AD7656-1SDZ supports standalone operation. In this mode, external supplies must be provided: AVCC (4.75–5.25 V) at J703, DVCC (4.75–5.25 V) at J701, VDD (+12 to +16.5 V) and VSS (−12 to −16.5 V) at J100, and VDRIVE (3.3 V) at J7-14 (LK16 = B). Control signals (CONVST, WR, RD, CS, etc.) must be driven externally, and data capture requires custom host interface logic - unlike the plug-and-play USB/software workflow enabled by EVAL-SDP-CB1Z.