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WMS7171100P

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
WMS7170 / 7171
- 16 -
FIGURE 7 – WMS7171 TRIMMING VOLTAGE REFERENCE
FIGURE 8 – WMS7171 RF AMP CONTROL
FILTER
L1
CHOKE
WMS71xx WINPOT
CS\
U/D\
INC\
V
SS
R
A
/V
A
R
W
/V
W
R
B
/V
B
V
DD
RF Input
RF OUT
Q1
RF POWER AMP
C1
0.1uF
C2
CS\
INC\
U/D\
V
REFH
WMS71xx
V+
GND
V
REF = 5.0v
0V
5V
Vout
WMS7170 / 7171
Publication Release Date: July 2003
- 17 - Revision 1.0
11.1. LAYOUT CONSIDERATIONS
Use a 0.1µF bypass capacitor as close as possible to the V
DD
pin. This is recommended for best
performance. Often this can be done by placing the surface mount capacitor on the bottom side of the
PC board, directly between the V
DD
and V
SS
pins. Care should be taken to separate the analog and
digital traces. Sensitive traces should not run under the device or close to the bypass capacitors.
A dedicated plane for analog ground helps in reducing ground noise for sensitive analog signals.
CAP
V
DD
CS
R
B
/V
B
R
W
/V
W
INC
U/D
R
A
/V
A
V
SS
ANALOG
SIGNAL LINES
DIGITAL
CONTROL LINES
ANALOG
SIGNAL LINE
DIGITAL
CONTROL LINE
FIGURE 9 – WMS7170/7171 LAYOUT
WMS7170 / 7171
- 18 -
12. PACKAGE DRAWINGS AND DIMENSIONS
E
1
8
5
4
Control demensions are in milmeters .
θ
E
FIGURE 10: 8L 150MIL SOIC
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

WMS7171100P

Mfr. #:
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Description:
IC POT DGTL 100K 100TAPS 8-DIP
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