Analog Devices Inc. AD9280ARSZ

Overview

AD9280ARSZ from Analog Devices is a monolithic 8-bit, 32 MSPS CMOS analog-to-digital converter with integrated sample-and-hold amplifier, on-chip voltage reference, and three-state digital outputs. It delivers 49 dB SINAD at 3.58 MHz input, ±0.2 LSB DNL, 95 mW power dissipation at 3 V, and supports IF undersampling up to 135 MHz - used in video digitization, communications receivers, and instrumentation front-ends.

For engineers reviewing the AD9280ARSZ datasheet, AD9280ARSZ pinout, AD9280ARSZ application, or AD9280ARSZ equivalent, this page provides verified technical context, validated pin functions, confirmed dynamic performance metrics (SINAD, SFDR, THD), real-world clamp and reference configuration options, and two rigorously cross-checked alternative ADCs for 8-bit/32 MSPS signal acquisition systems.

Technical Context

The AD9280ARSZ employs a multistage differential pipeline architecture enabling guaranteed no-missing-codes operation across –40°C to +85°C. Its sample-and-hold supports both single-ended and differential inputs, with programmable clamp functionality for DC restoration of AC-coupled video signals.

It features dual-reference flexibility: internal 1 V or 2 V reference (via REFSENSE strapping), external reference mode (REFSENSE = AVDD), or center-span configuration (MODE = AVDD/2). Digital interface uses straight-binary output, OTR overflow flag, and three-state enable controlled by the THREE-STATE pin.

Key Specifications

Pinout & Package

AD9280ARSZ is housed in a 28-lead SSOP (Shrink Small Outline Package), 5.6 mm × 10.2 mm body, 0.65 mm pitch, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit, 32 MSPS analog-to-digital converter applications.

Compared with AD9280ARSZ, AD9288ASTZ offers higher speed and dual-channel capability at the expense of power and missing key analog support functions, while MAX1186EEE+ trades integration for smaller size and slightly higher DNL - making AD9280ARSZ the balanced choice for embedded video, IF sampling, and industrial DAQ where clamp, reference, and thermal stability are design-critical.

Availability

AD9280ARSZ is available at Aetrix Electronics and suitable for video digitization, communications receiver front-ends, and industrial data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed no-missing-codes performance across industrial temperature range.

Supply support for AD9280ARSZ 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 AD9280ARSZ belongs to Analog Devices' high-speed ADC product line, engineered for precision digitization in communications, imaging, and instrumentation - emphasizing low power, on-chip analog support, and robust operation across extended temperature ranges.

FAQ

What is the absolute maximum clock frequency supported by the AD9280ARSZ?

The AD9280ARSZ is specified for continuous operation at 32 MSPS, with absolute maximum ratings permitting short-duration clock pulses up to 40 MHz. However, dynamic performance (SINAD, SFDR) degrades above 32 MSPS - e.g., SFDR drops from 66 dB to 51.4 dB at 16 MHz input - so 32 MSPS is the validated maximum for full-spec operation. The AD9280ARSZ must be operated within its published timing windows (tCH/tCL ≥14.7 ns) to maintain pipeline integrity and avoid metastability.

Does the AD9280ARSZ support differential input configurations, and how is it implemented?

Yes, the AD9280ARSZ supports true differential input via the AIN pin and shorted REFTS/REFBS pins, with MODE tied to AVDD/2. In this mode, the input span becomes ±VREF/2 around the common-mode voltage set by REFTS/REFBS. This configuration delivers optimal distortion performance (lower THD) compared to single-ended use. The AD9280ARSZ does not require external transformers or baluns - the internal SHA and reference buffer enable direct differential drive, preserving 300 MHz bandwidth and 2 ps aperture jitter.

How does the built-in clamp function of the AD9280ARSZ operate, and what are its voltage limits?

The AD9280ARSZ clamp circuit uses an internal amplifier and switch (SW1) to servo the AIN node to the voltage applied at CLAMPIN (0.5 V to 2.0 V range). When CLAMP is asserted high, SW1 closes and the amplifier forces AIN = CLAMPIN; when CLAMP goes low, SW1 opens and the input coupling capacitor holds the restored DC level. Clamp error is ±60 mV (typ), and acquisition time depends on RIN and CIN - e.g., 140 µs for 1 V step with 1 µF/20 Ω. This function is integral to the AD9280ARSZ and requires no external components beyond CLAMPIN biasing.

Can the AD9280ARSZ operate from a 5 V supply, and what are the implications for power and performance?

Yes, the AD9280ARSZ operates from AVDD and DRVDD supplies between +2.7 V and +5.5 V. At 5 V, power consumption rises to ~110 mW (vs. 95 mW at 3 V), and digital output VOH/VOL shift per datasheet specs - e.g., VOH = +4.5 V (IOH = 50 µA). Dynamic performance remains unchanged: SINAD, SFDR, and aperture jitter are supply-independent. However, thermal dissipation increases, and the 5 V mode is typically selected only when interfacing with legacy 5 V logic or when maximizing noise margin is prioritized over power efficiency in the AD9280ARSZ design.

What is the pipeline latency of the AD9280ARSZ, and how does it affect system synchronization?

The AD9280ARSZ has a fixed pipeline latency of 3 clock cycles - meaning the digital output corresponding to a sample taken at CLK edge N appears at D0–D7 on edge N+3. This deterministic delay enables precise timing alignment in synchronous systems, such as FPGA-based digital downconverters or real-time video processors. Unlike asynchronous converters, the AD9280ARSZ latency is invariant with input frequency or reference mode, simplifying timing closure and eliminating need for variable delay compensation in the AD9280ARSZ signal chain.