WCDMA Quasi-Direct Modulator
with VGA and PA Driver
SDATA
BIT 15
BIT 14
BIT 5
BIT 4
A1
A0
SCLK
t CWH
CS
t CWL
t CS
t CH
t ES
Figure 1. 3-Wire SPI/MICROWIRE Serial-Interface Timing Diagram
MSB
DATA 16 BITS
20-BIT REGISTER
ADDRESS 4 BITS
LSB
B15
B14
B13
B12
B11
B10
B9
B8 B7
B6
B5
B4
B3
B2
B1
B0
A3
A2 A1
A0
RFM DIVIDE RATIO REGISTER (16 BITS)
ADDRESS
B15
B14
B13
B12
B11
B10
B9 B8 B7 B6 B5
B4
B3
B2
B1
B0
0
0 1
0
RFR DIVIDE RATIO REGISTER (9 BITS)
ADDRESS
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6 B5 B4 B3 B2
B1
B0
0
0
0
0
OPERATION CONTROL REGISTER (16 BITS)
ADDRESS
B15
B14
B13
B12
B11
B10 B9 B8 B7 B6 B5
B4
B3
B2
B1
B0
0
1 0
0
Figure 2. Register Assignments
It is recommended that the exposed pad be soldered
to a ground plane on the PCB, either directly or through
an array of plated via holes. Soldering the pad to
ground is critical for proper heat dissipation. Use a
solid ground plane wherever possible. Any cutout in the
ground plane may act as a slot radiator and reduce its
shield effectiveness.
______________________________________________________________________________________
11
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