Analog Devices Inc. AD9022AZ

Overview

AD9022AZ from Analog Devices is a monolithic 12-bit, 20 MSPS analog-to-digital converter with on-chip track-and-hold and reference, TTL-compatible logic, ±1.024 V analog input range, 110 MHz analog bandwidth, and specified operation from –25°C to +85°C in ceramic gullwing surface-mount package. It delivers 74 dB spurious-free dynamic range at 9.6 MHz input and supports undersampling applications such as direct IF-to-digital conversion in radar receivers.

For engineers reviewing the AD9022AZ datasheet, AD9022AZ pinout, AD9022AZ application, or AD9022AZ equivalent, key selection considerations include its TTL-level digital interface, 20 ns transient response, 6 ps rms aperture jitter, 1.4 W power dissipation, and compatibility with high-speed layout practices for RF/IF signal chains.

Technical Context

The AD9022AZ employs a three-pass subranging architecture with digital error correction to achieve 12-bit accuracy at 20 MSPS. Its internal track-and-hold has 110 MHz bandwidth and is optimized for analog inputs above Nyquist, enabling robust undersampling performance up to 70 MHz when paired with external Samplifier™ devices like AD9100/AD9101.

All timing is generated internally; conversion initiates on the rising edge of the ENCODE signal (Pin 8), with output data available after 15–27.5 ns propagation delay. The device uses offset binary coding, requires +5 V and –5.2 V supplies, and features 300 Ω analog input impedance with 5 pF capacitance.

Key Specifications

Pinout & Package

AD9022AZ is packaged in a 28-pin ceramic gullwing surface-mount package (Z-28 option), with thermal impedance θ_JA = 45°C/W and θ_JC = 13°C/W. Pin 17 (COMP) requires direct 0.1 µF bypass to –VS (Pin 15) for stable operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed ADC applications.

Compared with AD9023AZ, AD9022AZ offers plug-in compatibility with TTL logic but sacrifices ECL's noise immunity; versus AD9220AR, it provides double the sample rate and full signal-chain integration at higher power and dual-supply complexity.

Availability

AD9022AZ is available at Aetrix Electronics and suitable for radar receivers, digital communications infrastructure, and electro-optic sensing systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD9022AZ 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 AD9022 product line was designed specifically for high-dynamic-range, high-speed digitization in RF/IF signal chains-targeting defense, aerospace, and test equipment applications demanding undersampling capability and integrated T/H functionality.

FAQ

What is the operating temperature range for the AD9022AZ?

The AD9022AZ is specified for industrial temperature operation from –25°C to +85°C. This range is confirmed in the Ordering Guide section of the AD9022 datasheet Rev. A, where "AZ" denotes the ceramic gullwing package variant qualified for this temperature grade. It is distinct from the military-grade "SZ" variant (–55°C to +125°C) and shares the same electrical specifications as the "AQ" (ceramic DIP) counterpart within this range.

Does the AD9022AZ require an external reference or track-and-hold circuit?

No, the AD9022AZ does not require external reference or track-and-hold components. As stated in the PRODUCT DESCRIPTION, it integrates both an on-chip reference and a 110 MHz bandwidth track-and-hold amplifier. The full-scale analog input is fixed at ±1.024 V, and the internal T/H eliminates the need for external sampling circuitry-making the AD9022AZ a complete, self-contained ADC solution.

What is the significance of the COMP pin (Pin 17) on the AD9022AZ?

The COMP pin (Pin 17) on the AD9022AZ is an internal compensation node that must be connected to the –5.2 V supply (Pin 15) via a 0.1 µF ceramic capacitor placed within 2 mm of the package. Per the datasheet, failure to implement this connection causes instability, degraded SFDR, and increased harmonic distortion. This requirement is explicitly called out in the PIN DESCRIPTIONS and USING THE AD9022 sections.

Can the AD9022AZ operate at encode rates below 4 MSPS?

No, operation below 4 MSPS is not recommended for the AD9022AZ. The datasheet states that encoding at rates less than 4 MSPS causes internal track-and-hold saturation, resulting in large DC and AC errors and erroneous conversions. This limitation is due to droop in the internal T/H devices and precludes burst-mode or variable-rate sampling at low frequencies.

What digital output coding format does the AD9022AZ use?

The AD9022AZ uses offset binary coding for its 12-bit parallel digital outputs. This is confirmed in the DIGITAL OUTPUTS section of the AD9022 datasheet Rev. A, which lists "Offset Binary" as the output coding for all variants including AD9022AZ. In this format, zero-scale input (–1.024 V) corresponds to output code 0x000, mid-scale (0 V) to 0x800, and full-scale (+1.024 V) to 0xFFF.