ADL5801

Rev. 0 | Page 13 of 20

APPLICATIONS INFORMATION

BASIC CONNECTIONS

The ADL5801 is designed to translate between radio frequencies

(RF) and intermediate frequencies (IF). For both upconversion

and downconversion applications, RFIP (Pin 16) and RFIN

(Pin 15) must be configured as the input interfaces. IFOP

(Pin 20) and IFON (Pin 21) must be configured as the output

interfaces. Individual bypass capacitors are needed in close

proximity to each supply pin (Pin 7, Pin 13, Pin 18, and Pin 24),

the VSET control pin (Pin 10), and the DETO detector output pin

(Pin 11). When the on-chip detector is chosen to form a closed

loop, automatically controlling the VSET pin, R7 can be

populated with a 0 Ω resistor. Alternatively, simply use a jumper

between the VSET and DETO test points for evaluation. Figure

28 illustrates the basic connections for ADL5801 operation.

RF AND LO PORTS

The RF and LO input ports are designed for a differential input

impedance of approximately 50 Ω.Figure 29 and Figure 30

illustrate the RF and LO interfaces, respectively. It is recommended

that each of the RF and LO differential ports be driven through a

balun for optimum performance. It is also necessary to ac couple

both RF and LO ports. Using proper value capacitors may help

improve the input return loss over desired frequencies. Table 4

lists the recommended components for various RF and LO

frequency bands. The characterization data is available in the

Typical Performance Characteristics section.

GND

VPLO

ENBL VSET

VPDT

RFIP

NC

GND

GND

VPLO

LOIP

T2

T4

T7

T3

T6

T9

C4

C5

C50

C6

C1

C12

C18

C8

C10

C9

C2

C3

T1

T5

T8

C17

VPOS

VSET

R10

R9

R7

VPOS

VPOS

VPOS

IFOP

LOIP

LOIN

C7

VPOS

DETO

LOIN

GND

GND

ADL5801

GND

GND

IFON

DETO GND

VPRF

GND

GND

IFOP

RFIN

24

1

2

3

4

5

7

8

9

10

11

12

6

18

17

16

15

14

13

23

22

21

20

19

IFON

ENBL

R12

R8

RFIP

RFIN

R4

R16

R14

C20

R50

C19

C13

L3

L1

L4

L5

L2

R3

R13

R11

R2

Figure 28. Basic Connections Schematic