Analog Devices Inc. AD8264ACPZ

Overview

AD8264ACPZ from Analog Devices is a quad-channel, DC-coupled, linear-in-dB variable gain amplifier (VGA) with integrated differential output buffers. It delivers 235 MHz small-signal bandwidth to the VGA stage, 80 MHz to the differential output, 2.3 nV/√Hz input voltage noise, ±2.5 V to ±5 V dual supply operation, and 0–24 dB gain range (input to VGA output), enabling high-fidelity pulse processing in multichannel medical and test instrumentation.

For engineers reviewing the AD8264ACPZ datasheet, AD8264ACPZ pinout, AD8264ACPZ application, or AD8264ACPZ equivalent, this page provides verified specifications, channel-specific gain control interface details, differential output offset and common-mode configuration, thermal performance data for CP-40-91 package, and validated alternatives for ultrasound front-end and radar receiver signal chains.

Technical Context

The AD8264ACPZ integrates four independent channels, each comprising a single-ended-input preamp/VGA section followed by a 6 dB fixed-gain differential output amplifier. Its floating gain control interface (GNHx/GNLO) enables precise 20 dB/V linear-in-dB scaling across −0.7 V to +0.7 V control voltage range, with <±0.3 dB gain law conformance over −40°C to +105°C.

Each channel supports independent gain adjustment referenced to shared GNLO, while VOCM and OFSx pins allow full dc-level control of differential output common-mode and offset-critical for direct coupling to modern high-speed ADCs. The device maintains <1 Ω differential output impedance up to 10 MHz and achieves 25 ns overload recovery time.

Key Specifications

Pinout & Package

The AD8264ACPZ is housed in a 40-lead LFCSP package (CP-40-91) with exposed pad (Pin 0) requiring solder connection to ground plane for RF stability and thermal dissipation. Package dimensions: 6 mm × 6 mm × 0.85 mm, thermal resistance θJA = 31.0°C/W (4-layer JEDEC board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar variable gain amplifier applications.

Compared with AD8264ACPZ, AD8367ARUZ offers higher bandwidth but requires external circuitry for differential drive and dc coupling, increasing BOM count and layout complexity; LMH6401IRGTR delivers superior RF performance but sacrifices dc fidelity and quad integration, making it less optimal for medical pulse processing where channel matching and baseline accuracy are critical.

Availability

AD8264ACPZ is available at Aetrix Electronics and suitable for multichannel data acquisition, positron emission tomography, and industrial ultrasound systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD8264ACPZ 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 AD8264ACPZ belongs to Analog Devices' precision wideband amplifier product line, designed specifically for high-fidelity, dc-coupled, multichannel signal conditioning in medical imaging, test equipment, and defense electronics.

FAQ

What is the maximum operating temperature range for AD8264ACPZ?

The AD8264ACPZ is specified for continuous operation from −40°C to +105°C. At supply voltages greater than ±3.3 V, the maximum ambient temperature is limited to +85°C per the datasheet's operating conditions table. Thermal derating must be applied above 85°C when using ±5 V supplies to maintain junction temperature below 150°C.

Does AD8264ACPZ support true dc-coupled operation across its full gain range?

Yes, AD8264ACPZ maintains full dc coupling from input to differential output across its entire 0–24 dB gain range. Its preamp/VGA and differential output stages are internally dc-coupled, and offset errors (e.g., ±10 mV differential output offset at VGAIN = 0.7 V) are characterized and stable over temperature-enabling accurate baseline preservation in pulse-processing applications.

How is gain controlled on AD8264ACPZ, and what is the required voltage range?

Gain on AD8264ACPZ is controlled differentially via GNHx and GNLO pins, where VGAIN = GNHx − GNLO. The linear-in-dB scaling is 20 dB/V over −0.7 V to +0.7 V, delivering 0–24 dB gain (VGA output) or 6–30 dB (differential output). GNLO serves as the common reference for all four channels' GNH inputs, enabling synchronized or independent gain programming.

Can AD8264ACPZ drive a 500 Ω differential load directly, and what is its output impedance?

Yes, AD8264ACPZ is characterized into 500 Ω per side (1 kΩ differential) loads. Its differential output impedance is <1 Ω up to 10 MHz, ensuring minimal signal loss and reflection when driving high-speed ADC inputs. Output swing reaches |VS| − 0.5 V (e.g., 2.5 V p-p at ±3.3 V supplies), meeting typical ADC full-scale requirements.

What is the purpose of the VOCM and OFSx pins on AD8264ACPZ?

VOCM sets the common-mode voltage of the differential outputs (VOHx/VOLx), adjustable from −1.4 V to +1.4 V-used to match an ADC's reference voltage. OFSx controls the differential output offset (noninverting input to the output amplifier), allowing fine dc-level trimming per channel. Both pins operate with full bandwidth and are essential for dc-coupled ADC interfacing without external level-shifting circuitry.