Analog Devices Inc. AD9267BCPZ

Overview

AD9267BCPZ from Analog Devices is a dual-channel, 16-bit continuous-time sigma-delta modulator optimized for high-dynamic-range RF/IF digitization in wireless baseband receivers. It delivers 83 dB SNR and −88 dBc SFDR over 10 MHz real (20 MHz complex) bandwidth, operates at 640 MSPS with 4-bit LVDS output, and integrates on-chip PLL, voltage reference, and 1 kΩ resistive input impedance - enabling direct connection to passive front-ends in W-CDMA and LTE quadrature receivers.

For engineers reviewing the AD9267BCPZ datasheet, AD9267BCPZ pinout, AD9267BCPZ application, or AD9267BCPZ equivalent, key selection criteria include its 10 MHz analog input bandwidth, 15 dB noise figure, 1.8 V single-supply operation, 64-lead LFCSP package thermal performance, and dual-channel LVDS timing alignment via DCO± outputs.

Technical Context

The AD9267BCPZ employs a fifth-order continuous-time Σ-Δ architecture with 32× oversampling, where quantization noise shaping suppresses in-band noise while inherently rejecting aliases - eliminating external anti-alias filters. Its passive 1 kΩ differential input structure avoids active driver amplifiers and simplifies signal chain design.

Internal clock generation uses an integer-N PLL supporting 30–160 MHz reference inputs, or direct 608–672 MHz LVDS/CMOS/LVPECL clocking; digital outputs are 4-bit twos-complement LVDS at 640 MSPS with dedicated DCO± for latch synchronization and OR± flags per channel for overrange detection.

Key Specifications

Pinout & Package

The AD9267BCPZ is housed in a 64-lead LFCSP (CP-64-4) package with exposed thermal pad soldered to analog ground. Thermal resistance θ_JA is 22°C/W on a 4-layer board, requiring PCB-level thermal management for sustained 416 mW operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel sigma-delta modulator applications.

Compared with AD9267BCPZ, AD9268BCPZ-125 trades oversampling and alias rejection for simpler interface and lower cost at reduced bandwidth, while ADS58C20IRGCT offers higher throughput but sacrifices 5+ bits of effective resolution and inherent anti-aliasing - making AD9267BCPZ uniquely suited for wideband, filterless IF digitization.

Availability

AD9267BCPZ is available at Aetrix Electronics and suitable for baseband quadrature receivers, RF instrumentation, software-defined radio, and defense radar IF processing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD9267BCPZ 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 communications, industrial, automotive, and aerospace markets since 1965.

The AD9267BCPZ belongs to Analog Devices' high-speed continuous-time sigma-delta modulator product line, designed specifically for wideband, low-noise IF digitization in next-generation wireless infrastructure and test equipment.

FAQ

What is the maximum analog input frequency supported by the AD9267BCPZ?

The AD9267BCPZ supports a 10 MHz real (20 MHz complex) analog input bandwidth, verified per AC specifications in the datasheet. At 2.4–8.4 MHz input frequencies, it maintains 83 dB SNR and −88 dBc SFDR - confirming full performance within this band. Operation beyond 10 MHz results in roll-off due to internal loop filter response, not aliasing, as the continuous-time architecture inherently suppresses out-of-band energy.

Does the AD9267BCPZ require an external anti-alias filter?

No, the AD9267BCPZ does not require an external anti-alias filter. Its fifth-order continuous-time Σ-Δ architecture provides inherent alias rejection through noise shaping - the quantization noise transfer function places zeros in all alias bands, suppressing aliased components without passive or active filtering. This is confirmed in the Theory of Operation and Analog Input Considerations sections of the AD9267BCPZ datasheet.

How is the AD9267BCPZ clocked - via internal PLL or external source?

The AD9267BCPZ supports both clocking modes: an on-chip integer-N PLL accepts 30–160 MHz reference inputs and generates the internal 640 MHz sampling clock, or it can be directly clocked with 608–672 MHz LVDS/CMOS/LVPECL signals. The PLL_LOCKED pin indicates lock status, and PLLMULT0–PLLMULT4 pins configure the multiplication ratio - enabling flexible clock tree design in systems like LTE base stations.

What is the purpose of the OR± pins on the AD9267BCPZ?

The OR+A/OR−A and OR+B/OR−B pins on the AD9267BCPZ are differential overrange indicators that assert when input signal amplitude exceeds full-scale (±1 V differential). They provide real-time saturation detection per channel - used in automatic gain control (AGC) loops or FPGA-based monitoring to prevent clipping in wide dynamic range applications such as multicarrier GSM/EDGE receivers.

Can the AD9267BCPZ operate with an external voltage reference?

Yes, the AD9267BCPZ supports external reference operation. Setting Serial Register 0x18[6] disables the internal 0.5 V unbuffered reference, allowing connection of a precision external source like the ADR130B. The internal reference must be decoupled with 10 µF on VREF and CFILT; external references require matching impedance and low-noise layout to preserve the specified 15 dB noise figure and 83 dB SNR performance.