5.9 GHz to 23.6 GHz,

Wideband, Microwave Upconverter

Data Sheet

ADRF6780

Rev. D

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FEATURES

Wideband RF output frequency range: 5.9 GHz to 23.6 GHz

Two upconversion modes

Direct conversion from baseband I/Q to RF

Single sideband upconversion from real IF

LO input frequency range: 5.4 GHz to 14 GHz

LO doubler for up to 28 GHz

Matched 100 Ω balanced RF output, LO input, and IF input

High impedance baseband inputs

Sideband suppression and carrier feedthrough optimization

Variable attenuator and power detector for Tx power control

Programmable via 4-wire SPI interface

32-lead, 5 mm × 5 mm LFCSP microwave packaging

APPLICATIONS

Point to point microwave radios

Radar, electronic warfare systems

Instrumentation, automatic test equipment (ATE)

GENERAL DESCRIPTION

The ADRF6780 is a silicon germanium (SiGe) design, wideband,

microwave upconverter optimized for point to point microwave

radio designs operating in the 5.9 GHz to 23.6 GHz frequency

range.

The upconverter offers two modes of frequency translation. The

device is capable of direct conversion to radio frequency (RF)

from baseband I/Q input signals, as well as single sideband (SSB)

upconversion from a real intermediate frequency (IF) input

carrier frequency. The baseband inputs are high impedance and

are generally terminated off chip with 100 Ω differential back

terminations. The baseband I/Q input path can be disabled and

a modulated real IF signal anywhere from 0.8 GHz to 3.5 GHz can

fed into the IF input path and upconverted to 5.9 GHz to 23.6 GHz

while suppressing the unwanted sideband by typically better than

25 dBc. The serial port interface (SPI) allows tweaking of the

quadrature phase adjustment to allow optimum sideband

suppression. In addition, the SPI interface allows powering down

the output power detector to reduce power consumption when

power monitoring is not necessary.

The ADRF6780 upconverter comes in a compact, thermally

enhanced, 5 mm × 5 mm LFCSP package. The ADRF6780

operates over the −40°C to +85°C temperature range.

FUNCTIONAL BLOCK DIAGRAM

VVA

LOG

DET

ADC

×1

×2

SPI

ADRF6780

BIAS

CONTROL

QUAD

SPLITTER

BUFFER

32

8

7

6

5

4

3

2

1

17

18

19

20

21

22

23

24

31

30

29

28

27

26

25

9

10

11

12

13

14

15

16

SDTO

SCLK

SDIN

VP18

VPBI

IFIP

AGND

IFIN

RST

VDET

VPDT

VPRF

AGND

RFOP

AGND

RFON

AGND

SEN

VPLO

LOIN

LOIP

VPLO

ALM

AGND

PWDN

VPBB

BBIN

BBIP

BBQN

VATT

VPRF

BBQP

Figure 1.