AD9251BCPZ-20

Overview

The AD9251BCPZ-20 is a dual-channel, 14-bit analog-to-digital converter (ADC) operating at a maximum sampling rate of 20 MSPS. It utilizes a multistage differential pipeline architecture with output error correction logic to ensure no missing codes across the full operating temperature range. The device features a high-performance sample-and-hold circuit and an on-chip voltage reference. It operates from a single 1.8 V analog supply and supports digital driver supplies ranging from 1.8 V to 3.3 V. The ADC accepts a 2 V p-p differential analog input and provides data in offset binary, gray code, or twos complement formats.

Feature Summary

• Multistage differential pipeline architecture with output error correction logic for guaranteed linearity.
• Integrated sample-and-hold circuit and internal voltage reference designed for low power consumption.
• Programmable serial port interface supporting configuration of data formatting, clock division, and power modes.
• Built-in selectable digital test pattern generation for system verification.

Applications

• Diversity radio systems
• Multimode digital receivers
• I/Q demodulation systems
• Smart antenna systems

Procurement Notes

Verify that the component matches the specific speed grade suffix required for the application timing constraints. Confirm package orientation and pin alignment against the LFCSP-64 footprint specifications. Ensure the ordering suffix corresponds to the exact performance bin needed for the design requirements.

Selection Notes

Select this model when a 20 MSPS sampling rate is sufficient for the signal bandwidth. Consider the AD9251BCPZ-40, -65, or -80 variants if higher throughput is necessary. Evaluate the DRVDD supply voltage to determine compatibility with the receiving logic family. Check thermal dissipation requirements based on the selected power-down mode.

Part Context

This component belongs to the AD9251 family of dual-channel ADCs. The family includes variants with different maximum sampling rates, such as 40 MSPS, 65 MSPS, and 80 MSPS. All members share the same 64-lead LFCSP package and pinout, facilitating migration between resolution and speed grades within the product line.

Replacement Considerations

AD9251BCPZ-40

FAQ

What is the pipeline latency of the AD9251?

The pipeline delay or latency is 9 cycles.

Does the AD9251 support duty cycle stabilization?

Yes, it includes an optional duty cycle stabilizer (DCS) to compensate for wide variations in the clock duty cycle.

How is the common-mode voltage for the analog inputs set?

The common-mode voltage is set by the VCM pin, which outputs an analog voltage at midsupply.