Analog Devices Inc. AD9022BZ

Overview

AD9022BZ from Analog Devices is a monolithic 12-bit, 20 MSPS analog-to-digital converter with on-chip track-and-hold and voltage reference, TTL-compatible digital I/O, ±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 digitization in radar receivers.

For engineers reviewing the AD9022BZ datasheet, AD9022BZ pinout, AD9022BZ application, or AD9022BZ equivalent, this page provides verified technical context, real-world timing behavior (e.g., 0.71 ns typical aperture delay, 15–27.5 ns output delay), DC accuracy (±0.5 LSB DNL typ), dynamic performance curves, and validated alternative options for high-speed data acquisition systems.

Technical Context

The AD9022BZ employs a three-pass subranging architecture with digital error correction: a 5-bit flash ADC resolves MSBs, followed by residue amplification and encoding via second 5-bit and final 4-bit flash stages. All timing-including T/H control and data alignment-is generated internally from the rising edge of the ENCODE signal.

Its on-chip track-and-hold features 110 MHz analog bandwidth and is optimized for high-IF undersampling; harmonic distortion remains ≤72 dBc at 9.6 MHz input, and SFDR is maintained at 74 dB across industrial temperature range. Power delivery requires separate +5 V and –5.2 V supplies, with strict decoupling requirements-especially at Pin 17 (COMP), which must be bypassed directly to –VS with 0.1 µF.

Key Specifications

Pinout & Package

AD9022BZ is packaged in a 28-pin ceramic gullwing surface-mount (Z-28) package with 0.050" lead pitch and hermetically sealed construction for industrial temperature operation (–25°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9022BZ, AD9023BZ offers identical analog performance but mandates ECL signaling, increasing system complexity; AD9220AR reduces supply count and cost but sacrifices 10 MSPS speed, 4 dB SFDR, and integrated signal conditioning-making it unsuitable for direct IF sampling above 5 MHz.

Availability

AD9022BZ is available at Aetrix Electronics and suitable for radar receivers, digital communications infrastructure, and electro-optic test equipment requiring stable component supply across extended product lifecycles.

Supply support for AD9022BZ 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 Wilmington, MA.

The AD9022BZ belongs to Analog Devices' high-speed precision ADC product line, designed specifically for demanding undersampling and wideband digitization applications in defense, communications, and instrumentation.

FAQ

What is the absolute maximum encode rate for AD9022BZ?

The AD9022BZ is rated for a maximum conversion rate of 20 MSPS under all operating conditions. Exceeding this rate violates parametric guarantees and may cause metastability, increased DNL, or invalid output codes. The device's internal timing architecture-including T/H hold time and pipeline delays-is optimized for 20 MSPS; operation beyond this limit is neither characterized nor supported. Always verify timing margins using the AD9022BZ timing diagram and maintain ENCODE pulse width ≥22.5 ns.

Does AD9022BZ require an external reference voltage?

No, AD9022BZ does not require an external reference voltage. It integrates a precision internal reference that establishes a fixed ±1.024 V full-scale analog input range. This eliminates external reference components, associated drift, and noise coupling paths. The reference is trimmed during manufacturing and remains stable over temperature (–25°C to +85°C); no user adjustment or calibration is possible or required for standard operation.

Can AD9022BZ operate with a single +5 V supply?

No, AD9022BZ cannot operate with a single +5 V supply. It requires dual supplies: +5 V (Pin 6/10/14/26) and –5.2 V (Pin 13/15/27). The –5.2 V rail powers the analog core, T/H amplifier, and internal reference circuitry. Attempting operation with only +5 V will prevent proper biasing of internal bipolar transistors, resulting in no valid conversion or catastrophic latch-up. Decoupling capacitors must be applied independently to each supply pin.

What is the purpose of Pin 17 (COMP) on AD9022BZ?

Pin 17 (COMP) is the internal compensation node for the AD9022BZ's track-and-hold amplifier. It must be connected directly to the –5.2 V supply (Pin 15) using a 0.1 µF ceramic capacitor placed within 2 mm of Pin 17. This connection stabilizes high-frequency loop gain and prevents oscillation. Leaving COMP unconnected or routing it through long traces or RC networks degrades dynamic performance-causing increased harmonic distortion and reduced SFDR-especially above 5 MHz input frequencies.

Is AD9022BZ pin-compatible with AD9022AQ?

Yes, AD9022BZ is pin-compatible with AD9022AQ. Both share identical 28-pin Z-28 (gullwing) and Q-28 (ceramic DIP) footprints, identical pin functions, and identical electrical interface specifications-including TTL logic levels, timing parameters, and analog input characteristics. The only differences are temperature grade (AD9022AQ: –25°C to +85°C, same as BZ) and screening level (AQ is Grade I tested, BZ is Grade VI); both are fully interchangeable at the PCB layout level.