Analog Devices Inc. AD9268BCPZ-125

Overview

AD9268BCPZ-125 from Analog Devices is a dual, 16-bit, 125 MSPS analog-to-digital converter designed for high-performance communications receivers. It features differential analog inputs with 650 MHz bandwidth, 1.8 V analog and digital supplies, CMOS or LVDS output interface, and integrated duty cycle stabilizer - enabling direct IF sampling up to 300 MHz in diversity radio and multimode 3G/4G baseband systems.

For engineers reviewing the AD9268BCPZ-125 datasheet, AD9268BCPZ-125 pinout, AD9268BCPZ-125 application, or AD9268BCPZ-125 equivalent, key selection criteria include SNR (78.2 dBFS @ 70 MHz), SFDR (88 dBc @ 70 MHz), power consumption (750 mW @ 125 MSPS), channel isolation (95 dB), and SPI-configurable dither/reference modes for software-defined radio and ultrasound signal chain optimization.

Technical Context

The AD9268BCPZ-125 implements a multistage, differential pipelined ADC architecture with integrated error correction logic per channel. Its analog front-end supports flexible input ranges (1–2 V_p-p) and maintains 78.2 dBFS SNR at 70 MHz input frequency using a proprietary differential input stage optimized for wideband IF sampling.

Digital interface flexibility is provided via programmable 1.8 V CMOS or LVDS outputs, integer clock division (1–8×), and serial port control (SPI) for configuring data format, dither, reference mode, and power states. The device includes built-in self-test (BIST), overrange detection, and multichip synchronization support for coherent array applications.

Key Specifications

Pinout & Package

The AD9268BCPZ-125 is housed in a 64-lead LFCSP package (9 mm × 9 mm, 0.85 mm height) with exposed thermal pad soldered to AGND for optimal thermal performance and analog integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9258BCPZ-125 and ADS4249IRGCT, the AD9268BCPZ-125 uniquely delivers 16-bit resolution with integrated dither, internal reference, and multichip sync - making it optimal for high-dynamic-range, space-constrained SDR and medical imaging platforms where analog subsystem simplification is critical.

Availability

AD9268BCPZ-125 is available at Aetrix Electronics and suitable for communications infrastructure, ultrasound imaging, software-defined radio, and test & measurement applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD9268BCPZ-125 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets since 1965.

The AD9268 belongs to Analog Devices' high-speed ADC product line, engineered specifically for demanding communications and medical imaging applications where wideband IF sampling, low power, and dual-channel coherence are essential design requirements.

FAQ

What is the maximum analog input frequency supported by the AD9268BCPZ-125?

The AD9268BCPZ-125 supports analog input frequencies up to 300 MHz using IF sampling techniques. Its 650 MHz analog input bandwidth ensures minimal amplitude roll-off and phase distortion at these frequencies, validated by −3 dB point measurements and maintained SNR performance up to 200 MHz (75.5 dBFS). This capability enables direct digitization of first IF stages in cellular base stations and broadband receivers without additional downconversion stages.

Does the AD9268BCPZ-125 support both CMOS and LVDS output interfaces simultaneously?

No, the AD9268BCPZ-125 supports either CMOS or LVDS output mode per channel, selected via SPI register configuration - not simultaneously. In CMOS mode, outputs swing rail-to-rail (0–1.8 V) with 1.6 mA drive strength; in LVDS mode, differential outputs deliver 290–400 mV swing with 1.15–1.35 V common-mode voltage. Mode selection is fixed at power-up or runtime via SPI, and both channels must operate in the same mode.

How does the on-chip dither function improve SFDR in the AD9268BCPZ-125?

The AD9268BCPZ-125's optional on-chip dither injects a small, uncorrelated noise signal into the analog path before quantization, breaking up harmonic correlation between input tones and quantization error. At −23 dBFS input, this increases SFDR from 89 dBc to 106–109 dBc across 2.4–200 MHz - directly enhancing spur-free dynamic range for detecting low-level signals in dense spectral environments like spectrum monitoring or cognitive radio.

What is the purpose of the SYNC pin on the AD9268BCPZ-125?

The SYNC pin on the AD9268BCPZ-125 provides deterministic multichip synchronization for phase-aligned sampling across multiple converters. When asserted synchronously with the ADC clock, it resets internal pipeline stages and aligns sample timing across devices - essential for beamforming, MIMO, or phased-array radar systems requiring sub-sample coherence between parallel ADC channels.

Can the AD9268BCPZ-125 operate with a single 1.8 V supply?

The AD9268BCPZ-125 requires two independent 1.8 V supplies: AVDD for the analog core (pins 49, 50, 53, 54, 59, 60, 63, 64) and DRVDD for digital outputs (pins 10, 19, 28, 37). Both must be regulated to 1.8 V ±0.1 V. Sharing a single supply violates absolute maximum ratings and degrades SNR/SFDR due to digital switching noise coupling into the analog domain - separate low-noise LDOs are recommended per supply rail.