Analog Devices Inc. AD9235BCP-20

Overview

AD9235BCP-20 from Analog Devices is a 12-bit, 20 MSPS analog-to-digital converter (ADC) with single 3 V supply operation, differential input bandwidth up to 500 MHz, on-chip reference and sample-and-hold amplifier (SHA), and guaranteed no missing codes over –40°C to +85°C. It delivers 70.5 dBc SNR and 85 dBc SFDR at Nyquist with 2 V_p-p input, targeting IF sampling in communications receivers and battery-powered instrumentation.

For engineers reviewing the AD9235BCP-20 datasheet, AD9235BCP-20 pinout, AD9235BCP-20 application, or AD9235BCP-20 equivalent, this page provides verified technical context, exact pin functions for the 28-lead TSSOP package, real-world AC/DC specifications at 20 MSPS, and validated alternatives for 12-bit, low-power, medium-speed ADC replacement.

Technical Context

The AD9235BCP-20 employs a multistage differential pipelined architecture with output error correction logic to achieve 12-bit accuracy and guaranteed no missing codes across industrial temperature range. Its patented SHA supports both differential and single-ended analog inputs, with configurable input span (1 V_p-p or 2 V_p-p) and flexible offset via internal reference selection.

A single-ended clock input drives conversion cycles; duty cycle stabilizer (DCS) is disabled in the -20 variant per datasheet Table 3 footnote. Digital outputs are CMOS-compatible, supporting 2.5 V or 3.3 V logic via separate DRVDD supply, and include an out-of-range (OTR) flag synchronized to pipeline latency of 7 clock cycles.

Key Specifications

Pinout & Package

The AD9235BCP-20 is packaged in a 28-lead TSSOP (Thin Shrink Small Outline Package) with exposed pad, rated for –40°C to +85°C operation. Pin 1 is marked by a dot; pins are numbered counter-clockwise from top-left corner when viewed from top.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit, medium-speed ADC applications.

Compared with AD9235BRU-20, the AD9235BCP-20 offers identical electrical performance and pin compatibility but differs in packaging qualification and environmental compliance; versus ADS5271IPFP, it trades interface flexibility for integration density and power simplicity-making it optimal for space-constrained, single-supply embedded systems.

Availability

AD9235BCP-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 obsolescence management, and traceable sourcing.

Supply support for AD9235BCP-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 for cost-sensitive, power-constrained applications demanding high dynamic range at medium sampling rates-including portable medical imaging, wireless infrastructure, and handheld test equipment.

FAQ

What is the maximum analog input frequency supported by the AD9235BCP-20?

The AD9235BCP-20 features a 500 MHz differential input bandwidth and maintains usable SNR up to 100 MHz input frequency (68.3 dBc at f_IN = 100 MHz). Its aperture jitter of 0.5 ps rms ensures <1 LSB error at these frequencies, making it suitable for undersampling IF signals in communications and radar applications. The device does not specify a hard upper limit but is characterized for performance up to 100 MHz.

Does the AD9235BCP-20 include a clock duty cycle stabilizer (DCS)?

No-the AD9235BCP-20 does not include an active clock duty cycle stabilizer. Per datasheet Table 3 footnote, DCS functionality applies only to the AD9235BCP-65 variant. The -20 model requires a clock signal with ≥15 ns high/low pulse width and is specified for stable operation within standard CMOS duty cycle ranges (40%–60%).

Can the AD9235BCP-20 operate with a 2.5 V digital supply (DRVDD) while using 3 V for analog (AVDD)?

Yes-the AD9235BCP-20 supports independent analog and digital supplies: AVDD = 2.7–3.6 V and DRVDD = 2.25–3.6 V. Using DRVDD = 2.5 V allows direct interfacing with 2.5 V logic families (e.g., ASICs or FPGAs), while AVDD = 3 V ensures optimal SHA and pipeline performance. Both rails require dedicated decoupling to their respective grounds.

What is the purpose of the SENSE pin on the AD9235BCP-20?

The SENSE pin selects the internal reference voltage: tying SENSE to AGND configures the reference for 1.0 V output, while connecting it to AVDD selects 0.5 V. This setting directly determines the full-scale input range (2 V_p-p or 1 V_p-p differential), enabling flexible front-end gain scaling without external components. The selection is static and must be set before conversion begins.

Is the AD9235BCP-20 pin-compatible with other members of the AD9235 family?

Yes-the AD9235BCP-20 shares identical pinout and footprint with AD9235BCP-40 and AD9235BCP-65 in the same 28-lead TSSOP package. All variants use the same pin functions, timing parameters (except max clock rate), and registerless configuration, allowing hardware reuse across speed grades. Software/firmware must adjust for differing sample rate constraints and DCS availability.