Analog Devices Inc. AD9248BSTZ-20

Overview

AD9248BSTZ-20 from Analog Devices is a dual-channel, 14-bit, 20 MSPS analog-to-digital converter (ADC) with differential input, integrated voltage reference, and clock duty cycle stabilizer. It operates from a single 3 V supply (2.7–3.6 V), delivers 73.4 dB SNR at 2.4 MHz input, supports 1 V_p-p to 2 V_p-p analog input range, and is specified for industrial temperature range (−40°C to +85°C). It targets IF sampling in wireless receivers and portable test equipment.

For engineers reviewing the AD9248BSTZ-20 datasheet, AD9248BSTZ-20 pinout, AD9248BSTZ-20 application, or AD9248BSTZ-20 equivalent, this page provides verified technical context, exact pin functions, real-world use scenarios, validated alternatives, and supply support for volume procurement and BOM continuity.

Technical Context

The AD9248BSTZ-20 employs a multistage differential pipelined 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 >85 dB crosstalk immunity, enabling simultaneous high-fidelity digitization of two independent analog channels.

It supports flexible digital interface control via dedicated pins: DFS selects offset binary or twos complement data format; MUX_SELECT enables multiplexed single-port output; SHARED_REF configures independent or shared reference mode; DCS activates duty cycle stabilization for robust clock jitter tolerance. Each channel has independent power-down (PWDN_A/B) and output enable (OEB_A/B) controls.

Key Specifications

Pinout & Package

AD9248BSTZ-20 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 numbering follows standard LQFP top-view orientation with Pin 1 indicator.

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 and AD9238BSTZ-20, the AD9248BSTZ-20 uniquely balances 14-bit fidelity, 20 MSPS throughput, and 180 mW power-making it optimal for portable instrumentation where resolution matters more than raw speed or cost dominates over performance.

Availability

AD9248BSTZ-20 is available at Aetrix Electronics and suitable for ultrasound beamforming, IF sampling receivers, and battery-powered scopemeters requiring stable component supply across industrial temperature environments.

Supply support for AD9248BSTZ-20 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, headquartered in Norwood, MA.

The AD9248 belongs to Analog Devices' high-speed data converter product line, designed specifically for demanding communications, medical imaging, and test equipment applications requiring dual-channel synchronization and low-power 14-bit precision.

FAQ

What is the maximum analog input frequency supported by the AD9248BSTZ-20?

The AD9248BSTZ-20 features a 500 MHz 3 dB analog input bandwidth, enabling digitization of signals up to ~100 MHz under Nyquist conditions. However, its 20 MSPS sampling rate limits usable baseband to ≤10 MHz. For higher-frequency inputs, aliasing into the first Nyquist zone (DC–10 MHz) is leveraged in IF sampling architectures - confirmed by AC specs showing 71.5 dB SNR at 35 MHz input and 70 dB at 100 MHz.

Does the AD9248BSTZ-20 require an external voltage reference?

No, the AD9248BSTZ-20 integrates a precision 1.0 V voltage reference with ±35 mV output error over temperature. It also supports external reference via VREF and SENSE pins for applications needing tighter reference stability or adjustable full-scale range. Internal reference operation eliminates BOM cost and board space for discrete references in most ultrasound and portable instrument designs.

How does the clock duty cycle stabilizer (DCS) function in the AD9248BSTZ-20?

The DCS circuit in the AD9248BSTZ-20 actively corrects input clock duty cycle deviations, maintaining ADC performance even with duty cycles from 30% to 70%. This eliminates the need for external clock conditioners in systems using crystal oscillators or PLLs with poor duty cycle control. DCS is enabled via the DCS pin and improves SNR/SFDR consistency across varying clock sources - a key advantage in field-deployed receivers and test gear.

Can both channels of the AD9248BSTZ-20 operate independently?

Yes, the AD9248BSTZ-20 supports fully independent channel operation: CLK_A and CLK_B accept asynchronous clocks; PWDN_A and PWDN_B allow per-channel power-down; OEB_A and OEB_B control individual output bus states; SHARED_REF selects either independent or shared reference mode. This enables flexible configurations such as time-interleaved sampling, dual-signal monitoring, or standby channel redundancy - all verified in the functional block diagram and pin descriptions.

What is the pipeline latency of the AD9248BSTZ-20 and why does it matter?

The AD9248BSTZ-20 has a fixed 7-cycle pipeline latency from clock edge to valid output data. This deterministic delay is critical for real-time control loops and time-correlated multi-channel systems (e.g., ultrasound beam steering), where consistent timing alignment between acquisition and processing is required. The latency value is guaranteed across temperature and supply variations, enabling reliable firmware timing margins without recalibration.