ADL5350ACPZ-R7 datasheet(20/24 Pages) AD

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ADL5350

Preliminary Technical Data

Rev. PrC | Page 20 of 24

APPLICATIONS

LOW FREQUENCY APPLICATIONS

Using an external capacitor from the GC pin to VPOS makes it

possible to operate the ADL5350 at frequencies below 100 MHz.

This capacitor is required because the internal capacitor

between the LO buffer and the gate of the device is only 4 pF.

This capacitance combined with the gate resistance causes a

high-pass filter corner of 80 MHz.

GND

INPUT

VPOS

INPUT

OR OUTPUT

OUTPUT

OR INPUT

Figure 59. Block Diagram

This high-pass filter corner decreases the LO energy that is

reaching the mixer core. Using a 47 pF capacitor between VPOS

and GC reduces this corner frequency to 7 MHz.

The circuit in Figure 60 is designed for a RF of 70 MHz and an

IF of 10.7 MHz. The LO is at 59.3 MHz (Low Side LO). The

series resonant circuit is designed for 70 MHz and the parallel

resonant circuit is designed for 65 MHz.

RF/IF

GND2

LOIN

GND1

RF/IF

VPOS

270nH

10nF

4.7µF

56pF

47pF

100nH

10nF

47pF

10nF

100nH

GND1

ADL5350

ALL INDUCTORS

ARE 0603CS

SERIES FROM

COILCRAFT

Figure 60. 70 MHz to 10.7 MHz Down-Conversion Schematic

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