Analog Devices Inc. AD9248BSTZ-40

Overview

AD9248BSTZ-40 from Analog Devices is a dual-channel, 14-bit, 40 MSPS analog-to-digital converter (ADC) with differential input architecture, integrated voltage reference, and clock duty cycle stabilizer. It operates from a single 3 V supply (2.7–3.6 V), delivers 72.8 dB SNR and 84 dBc SFDR at 2.4 MHz input, and supports 1 V_p-p to 2 V_p-p flexible analog input range for IF sampling in wireless receivers.

For engineers reviewing the AD9248BSTZ-40 datasheet, AD9248BSTZ-40 pinout, AD9248BSTZ-40 application, or AD9248BSTZ-40 equivalent, this page provides verified specifications, LQFP-64 pin mapping, crosstalk immunity (>85 dB), dual-channel timing latency (7 cycles), and real-world use cases in ultrasound front-ends and WB-CDMA baseband digitization.

Technical Context

The AD9248BSTZ-40 employs a multistage differential pipelined ADC architecture with output error correction logic to guarantee 14-bit accuracy and no missing codes across −40°C to +85°C. Its dual sample-and-hold amplifiers feature 500 MHz 3 dB bandwidth and exceptional channel isolation (>85 dB).

It supports independent or shared reference modes via SHARED_REF pin, offers offset binary or twos complement data format selection via DFS pin, and includes a clock duty cycle stabilizer (DCS) that maintains performance across wide duty cycle variations - critical for jitter-sensitive IF sampling applications.

Key Specifications

Pinout & Package

AD9248BSTZ-40 is packaged in a Pb-free, 64-lead LQFP (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad connected to AGND. Pin 1 is marked by dot; top-side markings include "AD9248" and date code.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, 14-bit ADC applications.

Compared with AD9248BSTZ-40, AD9248BCPZ-40 offers superior thermal management in compact layouts, while AD9238BSTZ-40 trades 2 bits of resolution for lower cost and power - making the BSTZ-40 optimal for applications demanding 14-bit fidelity with LQFP manufacturability.

Availability

AD9248BSTZ-40 is available at Aetrix Electronics and suitable for ultrasound equipment, direct conversion receivers, and battery-powered test instruments requiring stable component supply, long-term obsolescence planning, and traceable sourcing.

Supply support for AD9248BSTZ-40 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 AD9248 product line delivers high-speed, high-resolution dual ADCs optimized for communications infrastructure, medical imaging, and portable instrumentation - emphasizing low power, integrated references, and robust IF sampling capability.

FAQ

What is the maximum analog input frequency supported by the AD9248BSTZ-40?

The AD9248BSTZ-40 features a 500 MHz 3 dB analog input bandwidth, enabling direct undersampling of RF/IF signals up to 126 MHz (as validated in Figure 7 of the datasheet). For Nyquist-limited operation, its 40 MSPS sampling rate supports baseband signals up to 20 MHz. Performance metrics like SNR and SFDR degrade above 35 MHz input but remain usable for aliasing-based IF sampling architectures.

Does the AD9248BSTZ-40 require external voltage reference components?

No, the AD9248BSTZ-40 integrates a precision voltage reference generating either 1.0 V (±35 mV) or 0.5 V (±2.5 mV) depending on SENSE pin configuration. External reference is optional - connecting an external 1.0 V source to VREF improves gain temperature drift from ±12 ppm/°C to ±1 ppm/°C, but is not required for standard operation.

How does the clock duty cycle stabilizer (DCS) function in the AD9248BSTZ-40?

The DCS circuit in the AD9248BSTZ-40 actively corrects clock duty cycle deviations between 30% and 70%, ensuring consistent aperture timing and minimizing jitter-induced SNR degradation. Enabled via the DCS pin, it operates independently per channel and eliminates need for external clock conditioning circuits - critical for systems using crystal oscillators or FPGA-generated clocks with poor duty cycle control.

Can both channels of the AD9248BSTZ-40 operate simultaneously at 40 MSPS?

Yes, the AD9248BSTZ-40 is specified for simultaneous dual-channel operation at full 40 MSPS, consuming 330 mW total. Each channel has independent clock inputs (CLK_A/CLK_B), power-down controls (PDWN_A/PDWN_B), and output enables (OEB_A/OEB_B), allowing synchronized or asynchronous sampling with guaranteed timing correlation and >85 dB channel isolation.

What is the pipeline latency of the AD9248BSTZ-40 and how does it impact system timing?

The AD9248BSTZ-40 has a fixed pipeline latency of 7 clock cycles from sample initiation to valid output data. This deterministic delay enables precise timing alignment in multi-ADC systems and simplifies FPGA-based data capture logic. Latency remains constant across all sampling rates (20/40/65 MSPS) and operating conditions, supporting real-time closed-loop control and beamforming algorithms.