Analog Devices Inc. EVAL-AD7298SDZ

Overview

EVAL-AD7298SDZ from Analog Devices is a full-featured evaluation board for the AD7298 - an 8-channel, 1 MSPS, 12-bit SAR ADC with integrated temperature sensor. It supports PC-based control via SDP interface, includes on-board ADP1706 LDO regulator and AD8022/AD8066 high-speed amplifiers, and enables bias-up circuitry for bipolar analog input conditioning.

For engineers reviewing the EVAL-AD7298SDZ datasheet, EVAL-AD7298SDZ pinout, EVAL-AD7298SDZ application, or EVAL-AD7298SDZ equivalent, this board delivers rapid functional validation of the AD7298's sequenced channel conversion, internal 2.5 V reference, temperature sensing (0.25°C resolution), and flexible analog signal conditioning paths.

Technical Context

The EVAL-AD7298SDZ interfaces directly with the AD7298 IC via a 120-way connector (J1) and supports both standalone and SDP-hosted operation. Power is supplied via ±5 V inputs at J2, with on-board decoupling using 10 μF and 0.1 μF capacitors per supply rail.

It implements analog bias-up circuitry to shift bipolar input signals for single-ended ADC operation, provides SMB connectors for all eight VINx channels plus VREF, PD/RST, and buffered outputs, and uses configurable link options (LK1–LK20, SL1–SL4) to define signal routing, reference selection, and amplifier inclusion in input paths.

Key Specifications

Availability

EVAL-AD7298SDZ is available at Aetrix Electronics and suitable for precision data acquisition, industrial sensor interface, and embedded temperature monitoring applications requiring stable component supply and validated reference design support.

Supply support for EVAL-AD7298SDZ 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-AD7298SDZ belongs to Analog Devices' evaluation platform family designed specifically to accelerate development and validation of precision ADC subsystems in test, measurement, and sensor signal chain applications.

FAQ

What is the primary function of the EVAL-AD7298SDZ?

The EVAL-AD7298SDZ is an evaluation board built exclusively for the AD7298 8-channel, 12-bit, 1 MSPS SAR ADC with integrated temperature sensor. It provides complete hardware and software infrastructure-including SDP interface, analog bias-up circuitry, on-board regulators, and configurable links-to validate the AD7298's performance, sequencing, reference options, and thermal sensing capability in real-world signal chains. The EVAL-AD7298SDZ does not operate as a standalone data acquisition system but serves as a controlled test platform for the AD7298 IC.

Does the EVAL-AD7298SDZ require external power supplies?

Yes, the EVAL-AD7298SDZ requires external ±5 V DC supplies applied to terminal block J2 when used with the SDP board. These supplies power the AD7298's analog section and bias-up circuitry. The 3.3 V digital supply (VCC) is generated on-board by the ADP1706 regulator. Decoupling is implemented using 10 μF and 0.1 μF capacitors per rail, as specified in UG-254. No USB-only operation is supported-the EVAL-AD7298SDZ relies on these dedicated analog supplies for proper ADC functionality.

How is analog input signal conditioning handled on the EVAL-AD7298SDZ?

The EVAL-AD7298SDZ includes an on-board analog bias-up circuit that shifts bipolar input signals (e.g., ±5 V) to a unipolar range (0–5 V) compatible with the AD7298's single-ended input architecture. Input is accepted via the VIN SMB connector, processed through a buffer (U10), and output at BIASED_VIN2. This biased signal can then be routed to any VINx channel using an SMB-to-SMB cable. Link options LK9 and LK20 determine whether the internal reference or external source drives the bias circuit, enabling precise control over offset calibration.

Which software tools are compatible with the EVAL-AD7298SDZ?

The EVAL-AD7298SDZ is supported by Analog Devices' official AD7298 Evaluation Software, distributed on CD with the kit and compatible with Windows XP (SP2) and Vista (32-bit). The software communicates with the board via the SDP interface and provides full control over the AD7298's control register-including channel sequencing, temperature sensor enablement (TSENSE), averaging mode, and reference selection. Real-time ADC conversion results and temperature readings are displayed graphically, with tabbed views for ADC data versus internal sensor output.

Can the EVAL-AD7298SDZ be used without the SDP board?

Yes, the EVAL-AD7298SDZ supports standalone operation, but requires manual configuration of link options (LK1–LK20, SL1–SL4) to route control signals, set reference sources, and define analog paths-since the SDP normally provides SCLK, DIN, DOUT, CS, and VDRIVE. Without the SDP, users must supply these signals externally and ensure correct voltage levels and timing. The UG-254 user guide details required link positions for standalone use in the "Link Options" section, and all necessary schematics and silkscreen layouts are provided for hardware-level verification.