Analog Devices Inc. AD9235BRURL7-20

Overview

AD9235BRURL7-20 from Analog Devices is a monolithic, single-supply 12-bit analog-to-digital converter (ADC) operating at 20 MSPS with 3 V supply (2.7–3.6 V), 70 dBc SNR at Nyquist, and differential input bandwidth up to 500 MHz. It integrates an on-chip sample-and-hold amplifier (SHA), voltage reference, and clock duty cycle stabilizer - enabling high-fidelity IF sampling in communications receivers and ultrasound front-ends.

For engineers reviewing the AD9235BRURL7-20 datasheet, AD9235BRURL7-20 pinout, AD9235BRURL7-20 application, or AD9235BRURL7-20 equivalent, this page delivers verified specifications, validated pin functions, confirmed industrial-temperature operation (–40°C to +85°C), real-world AC performance data at 20 MSPS, and two rigorously cross-checked alternative ADCs for IF-sampling and medical imaging designs.

Technical Context

The AD9235BRURL7-20 employs a multistage differential pipelined architecture with output error correction logic to guarantee 12-bit accuracy and no missing codes across its full industrial temperature range. Its patented SHA supports both differential and single-ended analog inputs with user-selectable 1 V_p-p or 2 V_p-p ranges and maintains <±0.4 LSB DNL at 20 MSPS.

It features a dedicated digital output driver supply (DRVDD = 2.25–3.6 V) for compatibility with 2.5 V or 3.3 V logic families, and includes an out-of-range (OTR) flag for overflow detection. The clock input accepts wide-duty-cycle signals, though the DCS function is disabled in the -20 variant per datasheet Rev. D.

Key Specifications

Pinout & Package

The AD9235BRURL7-20 is packaged in a 28-lead TSSOP (RU-28) with exposed paddle, rated for industrial temperature (–40°C to +85°C). Pinout matches functional definitions in Analog Devices datasheet Rev. D, Figure 3 and Table 6.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog-to-digital conversion applications.

Compared with AD9235BRURL7-20, AD9226ARZ offers higher speed but demands more support components, while ADS5271IPFP trades SNR and integration for channel scalability and serial interface - making AD9235BRURL7-20 optimal for cost-sensitive, single-channel IF-sampling and portable medical applications requiring minimal external circuitry.

Availability

AD9235BRURL7-20 is available at Aetrix Electronics and suitable for ultrasound equipment, IF sampling in communications receivers, and battery-powered instruments requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature performance.

Supply support for AD9235BRURL7-20 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD9235 family was designed specifically for medium-speed, high-accuracy data acquisition in communications, medical imaging, and portable instrumentation - emphasizing integration, low power, and robustness in thermally variable environments.

FAQ

What is the maximum analog input frequency supported by the AD9235BRURL7-20?

The AD9235BRURL7-20 features a 500 MHz analog input bandwidth, enabling faithful digitization of signals up to ~100 MHz while maintaining 68.3 dBc SNR per datasheet Rev. D. This makes it suitable for undersampling IF signals in CDMA-One receivers and wideband ultrasound echo processing where input frequencies exceed the Nyquist limit of 10 MHz.

Does the AD9235BRURL7-20 include an internal voltage reference?

Yes, the AD9235BRURL7-20 integrates a selectable 1.0 V or 0.5 V internal reference, configurable via the SENSE pin. Reference output error is ±5 mV (1 V mode) and ±2.5 mV (0.5 V mode), with load regulation of 0.8 mV and 0.1 mV respectively - eliminating need for external reference ICs in most IF-sampling and portable instrument designs.

Is the AD9235BRURL7-20 pin-compatible with other members of the AD9235 family?

No - the AD9235BRURL7-20 shares the same 28-lead TSSOP package and pinout as other AD9235BRU-xx variants (e.g., -40, -65), but differs electrically: the -20 version disables the clock duty cycle stabilizer (DCS), and its AC specs (e.g., SNR, SFDR) are specified at 20 MSPS only. Interchangeability requires validation of timing, power, and signal integrity in the target application.

What digital output formats does the AD9235BRURL7-20 support?

The AD9235BRURL7-20 supports both offset binary and twos complement data formats, selected via the MODE pin. Outputs are parallel 12-bit words (D0–D11), with D11 as MSB and D0 as LSB. Output drive levels comply with 2.5 V or 3.3 V CMOS logic standards depending on DRVDD setting, and include an OTR flag for overflow indication.

What is the power-down current consumption of the AD9235BRURL7-20?

In power-down mode (PDWN = high), the AD9235BRURL7-20 draws just 1.0 mW typical, as specified in Table 3 of datasheet Rev. D. This ultra-low standby power enables rapid wake-up (<3 ms) in battery-operated devices like handheld scopemeters and portable ultrasound probes without compromising acquisition readiness.