This document is the Analog Devices CN-0279 circuit reference manual, which details the design of a high IF sampling receiver front end circuit using the AD9642 14-bit, 250 MSPS analog-to-digital converter and the ADL5565 6 GHz ultrahigh dynamic range differential amplifier.
The document presents Circuit Note CN-0279, a reference design for a high-frequency receiver front end. The circuit utilizes the ADL5565 ultralow noise differential amplifier driver and the AD9642 14-bit, 250 MSPS analog-to-digital converter (ADC). It includes a third-order Butterworth antialiasing filter optimized for the amplifier and ADC interface requirements, achieving a total insertion loss of 5.8 dB and a bandwidth of 18 MHz.
| Center Frequency | 127 MHz |
|---|---|
| Bandwidth | 18 MHz |
| Pass-Band Flatness | 3 dB |
| Sampling Frequency | 205 MSPS |
| Overall Gain | 5.5 dB |
| Input Drive | 0.5 dBm |
The circuit is based on the ADL5565 ultralow noise differential amplifier driver and the AD9642 14-bit, 250 MSPS analog-to-digital converter.
The total insertion loss due to the filter network and other components is 5.8 dB.
A third-order Butterworth antialiasing filter is used, optimized based on the performance and interface requirements of the amplifier and ADC.