DC933A

DC933A demonstration circuit is a HF/VHF/UHF downconverting mixer featuring the LT®5512. The RF input frequency is optimized for 140MHz, and the IF output frequency range is 0.1MHz to 100MHz. With minor component changes, the demo board can be configured for different RF frequencies from 250KHz to 450MHz. The LT5512 is an active double-balanced mixer IC, optimized for high linearity HF, VHF and UHF applications. The IC includes an integrated LO buffer amplifier to drive the mixer and an RF buffer amplifier for improved LO-RF isolation. Internal bias circuits eliminate the need for precision external resistors and allow the device to be powered-down using the enable control (EN) pin. The externally matched RF and IF ports allow the mixer to be used at very low frequencies, below 1MHz or up to 3GHz. The differential LO input is designed for single-ended or a differential drive.

• 4.5V to 5.25V supply voltage range
• 56mA supply current (EN = High), 100µA maximum shutdown current (EN = Low)
• 2dB conversion gain
• 20.7dBm input 3rd order intercept (2-tone, -10dBm/tone, ∆f = 200KHz )
• 10.5dBm input 1dB compression, > 61dB RF to LO isolation
• ≤ -35dBm LO to IF leakage, ≤ -63dBm LO to RF leakage
• 10.3dB single-sideband noise figure