Complete Dual-Band
Quadrature Transmitter
______________________________________________________________________________________ 11
MAX2369
0
90
IF PLL
N.C.
REF
N.C.
N.C.
N.C.
TANK+
TANK-
IFLO
V
CC
I-
I+
V
CC
GND
RFL
RFH
GND GND GND
N.C.
V
CC
V
CC
V
CC
V
CC
GND V
CC
IFCP V
CC
N.C.
IFIN-
IFIN+
LOCK
LOL LOH
N.C.
RBIAS
BIAS
CTRL
V
CC
Q-
Q+
V
CC
V
CC
V
CC
V
CC
V
CC
VGC
IFOUT-
IFOUT+
V
CC
V
CC
V
CC
DAC GAIN
CONTROL INPUT
CELLULAR
OUTPUT
1
2
3
4
5
6
7
8
9
10
11
12
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
37
38
39
40
41
42
43
44
45
46
47
48
45
-45
/2
/2
0
90
CLK
DI
CS
?/DIV>
?/DIV>
SHDN
LOGIC INPUT
SHDN
TXGATE
LOGIC INPUT
LOCK
OUTPUT
TXGATE
FRAC-N
PLL
TANK
LOOP
FILTER
V
CC
V
CC
V
CC
V
CC
PCS
OUTPUT
Figure 2. MAX2369 Typical Application Circuit
when the SHDN pin is low it shuts down everything. In
either case, PLL programming and register information
is lost. To retain the register information, use standby
mode (STBY = 0).
Signal Flow Control
Table 6 shows an example of key registers for triple-
mode operation.
Applications Information
The MAX2369 is designed for use in dual-band, triple-
mode systems. It is recommended for triple-mode hand-
sets. A typical application circuit is shown in Figure 2.
3-Wire Interface
Figure 3 shows the 3-wire interface timing diagram. The
3-wire bus is SPI/QSPI/MICROWIRE compatible.
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