AD9643BCPZ-250

Analog To Digital Converters (ADC) Overview

The AD9643BCPZ-250 is a dual, 14-bit analog-to-digital converter (ADC) from Analog Devices Inc., operating at sampling speeds up to 250 MSPS. It features a multistage differential pipelined architecture with integrated output error correction logic and an internal voltage reference. The device supports flexible analog input ranges of 1.4 V p-p to 2.0 V p-p and utilizes LVDS outputs compliant with ANSI-644 levels. Key electrical specifications include a signal-to-noise ratio (SNR) of 70.6 dBFS at 185 MHz AIN, a spurious-free dynamic range (SFDR) of 85 dBc, and total power consumption of 785 mW at maximum sample rate. It operates on single 1.8 V supplies for both analog and digital domains.

Analog To Digital Converters (ADC) Feature Summary

• Dual-channel 14-bit ADC cores with integrated output error correction logic
• Internal voltage reference and ADC clock duty cycle stabilizer
• Flexible analog input range supporting frequencies up to 400 MHz
• Energy-saving power-down modes and user-configurable built-in self-test

Analog To Digital Converters (ADC) Applications

• Communications systems including TD-SCDMA, WiMax, WCDMA, CDMA2000, GSM, EDGE, and LTE
• Diversity radio systems and smart antenna systems
• I/Q demodulation systems and general-purpose software radios
• Ultrasound equipment and broadband data applications

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific speed grade suffix (-250) matches the required 250 MSPS conversion rate during procurement. Confirm that the LFCSP-64 package orientation and exposed paddle soldering requirements align with the PCB layout guidelines. Ensure compatibility with the 3-wire SPI interface for register programming and readback operations before finalizing orders.

Analog To Digital Converters (ADC) Selection Notes

Select this component when high linearity and low power consumption are critical for dual-channel applications. The AD9643 offers pin compatibility with the AD9613, AD6649, and AD6643, facilitating migration between different resolution or performance tiers. Consider the integer 1-to-8 input clock divider if the system clock frequency exceeds the maximum conversion rate.

Analog To Digital Converters (ADC) Part Context

The AD9643 belongs to the AD9643 series of dual 14-bit ADCs, which includes variants optimized for 170 MSPS and 210 MSPS operation. This specific part represents the highest speed grade within the family, designed for wide bandwidth communications applications. It shares architectural similarities with other Analog Devices high-speed converters but distinguishes itself through its integrated reference and duty cycle stabilizer.

Analog To Digital Converters (ADC) Replacement Considerations

The AD9643 is pin-compatible with the AD9613, AD6649, and AD6643. Designers migrating from these parts should verify that the lower speed grades or resolutions of the alternatives meet the system's bandwidth and dynamic range requirements.