wms7140 Winbond Electronics Corp America, wms7140 Datasheet - Page 17

• Manufacturer Part Number: wms7140
• Description: Nonvolatile Digital Potentiometers With Up/down 3-wire Interface, 10kohm, 50kohm, 100kohm Resistance 16 Taps With Optional Output Buffer
• Manufacturer: Winbond Electronics Corp America

Use a 0.1PF bypass capacitor as close as possible to the V
performance. Often this can be done by placing the surface mount capacitor on the bottom side of the
PC board, directly between the V
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.
CONTROL LINES
SIGNAL LINE
11.1. L
DIGITAL
ANALOG
AYOUT
C
ONSIDERATIONS
U/D
INC
V
V
SS
A
FIGURE 9 – WMS7140/1 LAYOUT
DD
and V
SS
pins. Care should be taken to separate the analog and
- 17 -
CAP
DD
Publication Release Date: April 21, 2005
pin. This is recommended for best
V
CS
V
V
DD
W
B
WMS7140/1
SIGNAL LINES
CONTROL LINE
ANALOG
DIGITAL
Revision 1.1