3

dc2091afa

DEMO MANUAL DC2091A

DeMo boarD scheMatic

VCTRL

GND

LOL

LOC

GND

TTCK

GND VCC EN SDO SDI SCLK CSB

GNDRF

GNDRF

RF

GNDRF

GNDRF

GNDRF

GND

BBMQ

BBPQ

BBMI

BBPI

TEMP

LTC5599IUF

25

24 23 22

21

20

19

18

17

16

J2

J6

J5

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

C4

0.01µF

L1, 39nH

C5, 15pF

C3

0.1µF

R1, 1

LO

VCTRL

TTCK

TEMP

BBMI

BBPI

GND

EN

GND

SDO

SDI

SCLK

CS

RF

VCC

3.3V

VCC

FB1

330 AT

100MHz

DC2091 F02

BBPQ

BBMQ

R12, OPT

R2, OPT

R8

49.9

C6

0.1µF

R3, 0

R4, 0

R5, 0

R6, 0

C1

4.7µF

C2, 1000pF

JP1

2

1

E2

E1

E3

E4

J1

E5

E6

J4

J3

E7

R9

49.9

*

*

C7

0.1µF

R10

49.9

C8

0.1µF

R11

49.9

C9

0.1µF

* REMOVE THE RC NETWORK FOR BEST EVM WITH COMPLEX DIGITAL MODULATION.

Figure 2. low Power I/Q Modulator Schematic

quick start proceDure

11. Calculate the Voltage Conversion Gain:

Gain = 20 • log (VRF(OUT)(50Ω) / VIN(DIFF)(I OR Q))

12. MeasuretheOutput1dBCompressionPointbyincreas-

ing the input signal level until the Voltage Conversion

Gain degrades by 1dB.

13. Measure the Image Rejection at 492.9MHz.

14. Measure the LO Leakage at 492.8MHz.

15. Connect the DC590B to the DC2091A with the ribbon

cable provided. Make sure jumper JP6 on the DC590B

is set to 3.3V.

16. Run QuikEval® to start the GUI associated with the

LTC5599.

17. The turn off procedure is the reverse of the turn on

procedure. Make sure

vCC is removed after veN.