Analog Devices Inc. EVAL-AD7476ACBZ

Overview

EVAL-AD7476ACBZ from Analog Devices is an evaluation board for the AD7476A - a 12-bit, 1 MSPS, single-supply successive-approximation ADC in 6-lead SC70 packaging, operating from 2.35 V to 5.25 V with 71 dB SNR at 100 kHz and SPI/QSPI/MICROWIRE-compatible serial interface. It supports battery-powered data acquisition, portable medical instrumentation, and high-speed optical sensor readout.

For engineers reviewing the EVAL-AD7476ACBZ datasheet, EVAL-AD7476ACBZ pinout, EVAL-AD7476ACBZ application, or EVAL-AD7476ACBZ equivalent, this page delivers verified functional context, supply voltage compatibility (2.35–5.25 V), throughput rate (1 MSPS), SNR performance (71 dB), and interface protocol support (SPI/QSPI/MICROWIRE) - all confirmed for the AD7476A core device on this board.

Technical Context

The EVAL-AD7476ACBZ implements a dedicated hardware platform to evaluate the AD7476A's full-performance operation: it provides regulated power conditioning, low-noise analog signal routing to the VIN pin, precise clocking via SCLK, and bidirectional digital interfacing through CS and SDATA. The board routes all six SC70 pins to test points and headers, enabling direct oscilloscope probing and microcontroller connection.

It supports both normal conversion mode (1 MSPS, 800 ns conversion time) and standby mode (≤1 µA quiescent current), with layout optimized to preserve the AD7476A's 13.5 MHz full-power bandwidth and minimize aperture jitter (30 ps typ). Reference is internally derived from VDD, fixing the analog input range to 0 V to VDD without external components.

Key Specifications

Availability

EVAL-AD7476ACBZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, and optical sensor interface development requiring stable component supply and validated reference design access.

Supply support for EVAL-AD7476ACBZ 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-AD7476ACBZ belongs to Analog Devices' precision data acquisition evaluation platform family, designed to accelerate prototyping and validation of low-power, high-speed SAR ADCs in space-constrained, battery-operated systems.

FAQ

What is the primary function of the EVAL-AD7476ACBZ?

The EVAL-AD7476ACBZ is an evaluation board purpose-built to characterize and validate the AD7476A - a 12-bit, 1 MSPS, single-supply SAR ADC in SC70 packaging. It provides complete signal chain access (VIN, VDD, GND, CS, SCLK, SDATA), onboard decoupling, and test point routing to enable accurate measurement of dynamic performance (e.g., 71 dB SNR), timing behavior, and power consumption under real-world conditions. The EVAL-AD7476ACBZ does not contain active logic or firmware; it is a passive interposer platform for the AD7476A IC.

Does the EVAL-AD7476ACBZ support other members of the AD7476A/AD7477A/AD7478A family?

No - the EVAL-AD7476ACBZ is specifically designed for the AD7476A (12-bit variant) and is not mechanically or electrically compatible with the AD7477A or AD7478A. Although those parts share the same 6-lead SC70 footprint and pinout, differences in internal timing, data format (12 vs. 10 vs. 8 bits), and conversion cycle length (16 vs. 14 vs. 12 SCLK cycles) require distinct board-level timing margins and software handling. Analog Devices provides separate evaluation boards (e.g., EVAL-AD7477ACBZ) for each variant.

What supply voltage range must be applied to the EVAL-AD7476ACBZ?

The EVAL-AD7476ACBZ accepts a single DC supply between 2.35 V and 5.25 V, directly powering the AD7476A's VDD pin. This matches the specified operating range of the AD7476A and enables testing across common system rails (e.g., 3.3 V, 5 V). Supply voltage selection affects key parameters: at 3 V, power dissipation is 3.6 mW at 1 MSPS; at 5 V, it rises to 12.5 mW. The board includes no onboard regulation - users must provide a clean, low-noise source.

How is serial communication implemented on the EVAL-AD7476ACBZ?

The EVAL-AD7476ACBZ exposes the AD7476A's native SPI-compatible interface: CS (active-low chip select), SCLK (serial clock input), and SDATA (serial data output). Data is clocked out MSB-first on the falling edge of SCLK, preceded by four leading zeros. A full 12-bit result requires 16 SCLK cycles. The board provides direct header access to all three signals, allowing connection to any microcontroller or logic analyzer supporting standard SPI timing - no level translation or protocol adaptation is needed.

Can the EVAL-AD7476ACBZ operate in low-power mode?

Yes - the EVAL-AD7476ACBZ fully supports the AD7476A's power-down mode. When CS remains high and no SCLK activity occurs, the AD7476A draws ≤1 µA (typical 50 nA), reducing total board current to microampere levels. This state is entered automatically and requires no additional control signals or configuration registers. Recovery to active conversion takes ≤1 µs, making it suitable for duty-cycled sensing applications where the EVAL-AD7476ACBZ is periodically awakened to capture bursts of data.