3
dc2091afa
DEMO MANUAL DC2091A
DeMo boarD scheMatic
V
CTRL
GND
LOL
LOC
GND
TTCK
GND V
CC
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, 1Ω
LO
V
CTRL
TTCK
TEMP
BBMI
BBPI
GND
EN
GND
SDO
SDI
SCLK
CS
RF
V
CC
3.3V
VCC
FB1
330Ω AT
100MHz
DC2091 F02
BBPQ
BBMQ
R12, OPT
R2, OPT
R8
49.9Ω
C6
0.1µF
R3, 0Ω
R4, 0Ω
R5, 0Ω
R6, 0Ω
C1
4.7µF
C2, 1000pF
JP1
2
1
E2
E1
E3
E4
J1
E5
E6
J4
J3
E7
R9
49.9Ω
*
*
C7
0.1µF
R10
49.9Ω
C8
0.1µF
R11
49.9Ω
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 (V
RF(OUT)(50Ω)
/ V
IN(DIFF)(I OR Q)
)
12. Measure the Output 1dB Compression Point by increas-
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 v
CC
is removed after v
eN.
