ADL5369ACPZ-R7 datasheet(19/23 Pages) AD

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Data Sheet

ADL5369

Rev. A | Page 19 of 23

APPLICATIONS INFORMATION

BASIC CONNECTIONS

The ADL5369 mixer is designed to upconvert or downconvert

between radio frequencies (RF) from 300 MHz to 1100 MHz and

intermediate frequencies (IF) from 30 MHz to 450 MHz. Figure 45

depicts the basic connections of the mixer. It is recommended

to ac-couple the RF and LO input ports to prevent non-zero dc

voltages from damaging the RF balun or LO input circuit. The

RFIN capacitor value of 8 pF is recommended to provide the

optimized RF input return loss for the desired frequency band.

For upconversion, drive the IF inputs, Pin 18 (IFON) and Pin 19

(IFOP), differentially or use a 1:1 ratio transformer for single-

ended operation. An 8 pF capacitor is recommended for the RF

output, Pin 2 (RFIN).

IF PORT

The real part of the output impedance is approximately 50 Ω,

as seen in Figure 25, which matches many commonly used SAW

filters without the need for a transformer. This results in a voltage

conversion loss that is approximately the same as the power

conversion loss, as shown in Table 3.

MIXER VGS CONTROL DAC

The ADL5369 features two logic control pins, Pin 12 (VGS0)

and Pin 13 (VGS1), that allow programmability for internal

gate to source voltages for optimizing mixer performance over

desired frequency bands. The evaluation board defaults both

VGS0 and VGS1 to ground. Power conversion loss, NF, and

IIP3 can be optimized, as shown in Figure 34 and Figure 35.

BIAS

GENERATOR

LO2_IN

RFIN

+5V

LO1_IN

10kΩ

0Ω

910Ω

C24

560pF

10kΩ

10pF

100pF

10pF

0.01µF

4.7µF

RBIAS LO

100pF

10pF

100pF

ADL5369

IF1_OUT

C25

560pF

Figure 45. Typical Application Circuit

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