ADL5353(RevA) Просмотр технического описания (PDF) - Analog Devices

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ADL5353
(Rev.:RevA)

2200 MHz to 2700 MHz Balanced Mixer, LO Buffer, IF Amplifier, and RF Balun

Analog Devices 

ADL5353

Data Sheet

APPLICATIONS INFORMATION

BASIC CONNECTIONS

The ADL5353 mixer is designed to downconvert radio frequen-

cies (RF) primarily between 2200 MHz and 2700 MHz to lower

intermediate frequencies (IF) between 30 MHz and 450 MHz.

Figure 50 depicts the basic connections of the mixer. To prevent

nonzero dc voltages from damaging the RF balun or LO input

circuit, ac couple the RF and LO input ports. The RFIN matching

network consists of a series 1.5 pF capacitor and a shunt 10 nH

inductor to provide the optimized RF input return loss for the

desired frequency band IF Port.

The mixer differential IF interface requires pull-up choke inductors

to bias the open-collector outputs and to set the output match.

The shunting impedance of the choke inductors used to couple

dc current into the IF amplifier should be selected to provide

the desired output return loss.

The real part of the output impedance is approximately 200 Ω,

which matches many commonly used SAW filters without the

+5V

need for a transformer. This results in a voltage conversion gain

that is approximately 6 dB higher than the power conversion gain,

as shown in Table 3. When a 50 Ω output impedance is needed,

use a 4:1 impedance transformer, as shown in Figure 50.

BIAS RESISTOR SELECTION

Two external resistors, RBIAS IF and RBIAS LO, are used to adjust the

bias current of the integrated amplifiers at the IF and LO terminals.

It is necessary to have a sufficient amount of current to bias both

the internal IF and LO amplifiers to optimize dc current vs.

optimum IIP3 performance.

MIXER VGS CONTROL DAC

The ADL5353 features two logic control pins, VGS0 (Pin 12) and

VGS1 (Pin 13), 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.

100pF

470nH

470nH

150pF

4:1

IF OUT

+5V

4.7µF

10pF

+5V

RBIAS IF

20

19

1

10kΩ

18

17

16

ADL5353

22pF

15

LO2 IN

1.5pF

RF IN

2

10nH

10pF

3

0.1µF

4

BIAS

GENERATOR

14

+5V

10pF

13

12

5

+5V

6

10pF

22pF

11

LO1 IN

7

8

RBIAS LO

9

10

10kΩ

10pF

Figure 50. Typical Application Circuit

Rev. A | Page 18 of 24

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