Analog Devices Inc. EVAL-AD7327SDZ

Overview

EVAL-AD7327SDZ from Analog Devices is an evaluation board for the AD7327 8-channel, 12-bit plus sign SAR ADC with true bipolar input capability, software-selectable ±10 V/±5 V/±2.5 V/0–10 V ranges, and 500 kSPS throughput. It enables rapid prototyping of high-precision industrial data acquisition systems requiring channel sequencing, differential/single-ended flexibility, and internal 2.5 V reference operation.

For engineers reviewing the EVAL-AD7327SDZ datasheet, EVAL-AD7327SDZ pinout, EVAL-AD7327SDZ application, or EVAL-AD7327SDZ equivalent, this board provides full access to the AD7327's SPI-compatible serial interface, temperature indicator, power-down modes, and configurable analog input structure - supporting validation of signal chain accuracy, channel isolation, and bipolar range performance in real-world sensor and control environments.

Technical Context

The EVAL-AD7327SDZ implements the AD7327's iCMOS process architecture, enabling ±16.5 V analog supply operation while maintaining 22 MHz full-power bandwidth and 76 dB SNR in true differential mode. Its hardware design exposes all 20 TSSOP pins-including VIN0–VIN7, REFIN/OUT, VDD/VSS, AGND/DGND, and SPI interface signals-to facilitate direct probing and external signal injection.

Board-level features include decoupling capacitors for VDD/VSS/VCC/VDRIVE, a 680 nF reference bypass on REFIN/OUT, jumper-selectable VDRIVE voltage (3.3 V or 5 V), and header-accessible digital I/O for microcontroller interfacing. The layout separates analog and digital ground planes with controlled impedance routing to preserve the AD7327's −72 dB channel-to-channel isolation and −79 dB CMRR up to 100 kHz.

Key Specifications

Availability

EVAL-AD7327SDZ is available at Aetrix Electronics and suitable for industrial process control, test & measurement instrumentation, motor drive feedback, and energy metering applications requiring stable component supply and validated high-voltage analog signal conditioning.

Supply support for EVAL-AD7327SDZ 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.

The EVAL-AD7327SDZ belongs to Analog Devices' precision data acquisition evaluation platform family, designed specifically to accelerate development of robust, high-fidelity analog front-ends for industrial automation and condition monitoring systems.

FAQ

What is the primary function of the EVAL-AD7327SDZ?

The EVAL-AD7327SDZ is an evaluation board for the AD7327 8-channel, 12-bit plus sign SAR ADC. It provides a complete, ready-to-use platform to evaluate the device's true bipolar input performance, software-selectable voltage ranges (±10 V, ±5 V, ±2.5 V, 0–10 V), 500 kSPS throughput, and SPI-compatible serial interface - enabling rapid validation of signal integrity, channel sequencing, and power management behavior before system integration.

Does the EVAL-AD7327SDZ support external reference operation for the AD7327?

Yes, the EVAL-AD7327SDZ supports both internal and external reference configurations for the AD7327. The REFIN/OUT pin is accessible via header and includes a dedicated 680 nF bypass capacitor footprint. When an external 2.5 V to 3.0 V reference is applied, the board enables extended ±12 V input range operation - provided VDD ≥ +12 V and VSS ≤ −12 V are supplied, as specified in the AD7327 datasheet.

Can the EVAL-AD7327SDZ be used to verify differential and pseudo-differential input modes?

Yes, the EVAL-AD7327SDZ fully supports verification of all AD7327 analog input configurations: eight single-ended, four true differential, four pseudo-differential, or seven pseudo-differential channels. Each VIN0–VIN7 terminal is independently accessible via screw terminals or headers, and the board's ground partitioning preserves the AD7327's −72 dB channel-to-channel isolation and −79 dB CMRR required for accurate differential measurements.

What power supply requirements must be met to operate the EVAL-AD7327SDZ with the AD7327?

To operate the EVAL-AD7327SDZ with the AD7327, three isolated supplies are required: VDD (+12 V to +16.5 V), VSS (−12 V to −16.5 V), and VCC/VDRIVE (2.7 V to 5.25 V). The board includes separate screw terminals for each rail and onboard decoupling. VDRIVE can be jumper-selected to 3.3 V or 5 V to match host controller logic levels, and AGND/DGND are internally connected only at a single point to maintain noise separation.

How does the EVAL-AD7327SDZ assist in validating the AD7327's temperature indicator functionality?

The EVAL-AD7327SDZ routes the AD7327's internal temperature indicator output to a test point and header pin, allowing direct measurement of its analog voltage output (typically ~0.4 V at 25°C, with 1.2 mV/°C slope). This enables correlation of measured voltage against ambient temperature and verification of the AD7327's on-chip thermal sensing accuracy across the −40°C to +85°C operating range without requiring additional circuitry.