Analog Devices Inc. AD9271BSVZRL-25

Overview

AD9271BSVZRL-25 from Analog Devices is an octal-channel ultrasound analog front-end (AFE) IC integrating low-noise preamplifiers (LNA), variable-gain amplifiers (VGA), 3rd-order antialiasing filters (AAF), 12-bit ADCs, and an 8×6 differential crosspoint switch. It delivers 1.1 nV/√Hz input-referred LNA noise at 5 MHz, −6 dB to +24 dB linear-in-dB VGA gain, programmable AAF cutoff from 8–18 MHz, and 12-bit conversion at up to 25 MSPS with 70 dB SNR. It targets medical ultrasound beamforming systems requiring high channel density and low power per channel.

For engineers reviewing the AD9271BSVZRL-25 datasheet, AD9271BSVZRL-25 pinout, AD9271BSVZRL-25 application, or AD9271BSVZRL-25 equivalent, this page provides verified technical context, exact pin functions for all 100 TQFP terminals, real-world use value in TGC and CW Doppler modes, and two validated alternative parts with documented functional and application differences.

Technical Context

The AD9271BSVZRL-25 implements a fully differential signal path per channel with active single-ended-to-differential LNA input termination and dual-mode impedance matching (50 Ω / 100 Ω / 15 kΩ). Its integrated AAF is a programmable 3rd-order Butterworth filter placed between VGA and ADC stages, supporting LPF cutoffs from 8 MHz to 18 MHz with ±15% bandwidth tolerance and ±2 ns group delay variation across 1–18 MHz.

Each of the eight channels operates independently with SPI-programmable gain control, overload recovery <10 ns, and fast wake-up (<2 μs from standby). In CW Doppler mode, the LNA output drives a transconductance amplifier routed through the 8×6 crosspoint switch, while the VGA, AAF, and ADC are powered down-enabling dedicated continuous-wave signal extraction without ADC latency or quantization noise.

Key Specifications

Pinout & Package

AD9271BSVZRL-25 is housed in a RoHS-compliant 100-lead TQFP (16 mm × 16 mm) with exposed thermal paddle. All analog and digital supplies are distributed across multiple pins for low-impedance routing and noise isolation. Pin 0 is the exposed paddle, tied to quiet analog ground.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrasound analog front-end applications.

Compared with AD9271BSVZRL-25, AD9272BSVZ-40 offers higher throughput at the cost of power and clocking overhead, while AFE5809IRGCT trades integrated CW routing for higher resolution and parallel interface flexibility-making AD9271BSVZRL-25 optimal for cost-sensitive, space-constrained ultrasound systems needing both TGC and CW Doppler in one package.

Availability

AD9271BSVZRL-25 is available at Aetrix Electronics and suitable for medical ultrasound imaging, portable diagnostic equipment, and automotive radar receivers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD9271BSVZRL-25 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, communications, and healthcare markets since 1965.

The AD9271 product line was designed specifically for ultrasound equipment manufacturers, integrating LNA, VGA, AAF, ADC, and CW switching into a single TQFP package to reduce system size, power, and design cycle time for medical and industrial imaging.

FAQ

What is the maximum sampling rate supported by the AD9271BSVZRL-25?

The AD9271BSVZRL-25 supports a maximum sampling rate of 25 MSPS, as indicated by the "-25" suffix in its part number. This is confirmed in Table 1 of the Rev. B datasheet under AC Specifications, where AD9271-25 column lists 10–25 MSPS as the valid clock rate range. Higher-speed variants (e.g., AD9271-40) exist but are not pin-compatible or electrically interchangeable with AD9271BSVZRL-25.

Does the AD9271BSVZRL-25 include an integrated voltage reference?

Yes, the AD9271BSVZRL-25 includes an internal 1.0 V ADC reference with ±20 mV output error and 3 mV load regulation at 1.0 mA. The VREF pin serves as both input and output; it can accept an external reference or source the internal reference to external circuitry. REFT/REFB pins provide differential reference connections for improved noise immunity in high-precision applications.

How does the crosspoint switch in the AD9271BSVZRL-25 function in CW Doppler mode?

In CW Doppler mode, the AD9271BSVZRL-25 routes LNA outputs (LO-x/LOSW-x) through an internal 8×6 differential crosspoint switch to six CWDx± output pairs. This allows any of the eight LNA channels to be assigned to any of the six CW processing paths under SPI control-enabling flexible beamforming without external analog switches or multiplexers, while powering down the VGA, AAF, and ADC sections to minimize noise and power.

What power supply voltages are required for normal operation of the AD9271BSVZRL-25?

The AD9271BSVZRL-25 requires three separate supplies: 1.8 V for AVDD (analog core) and DRVDD (LVDS drivers), and 3.3 V for CWVDD (CW Doppler output bias). AVDD and DRVDD must remain within 1.7–1.9 V; CWVDD must be 3.0–3.6 V. Supply rejection ratio is 1 mV/V, so clean, well-decoupled rails are essential-especially for AVDD, which directly impacts LNA noise performance.

Can the AD9271BSVZRL-25 operate with a single-ended clock input?

No-the AD9271BSVZRL-25 requires a differential clock input (CLK+/CLK−) compliant with LVDS, LVPECL, or CMOS standards. The functional block diagram and Table 2 specify differential input voltage (250 mV_p-p min) and common-mode range (1.2 V typical). Single-ended clock sources must be converted to differential using a transformer or dedicated buffer to meet timing and jitter specifications (aperture uncertainty <1 ps rms).