wms7171 Winbond Electronics Corp America, wms7171 Datasheet - Page 14

• Manufacturer Part Number: wms7171
• Description: Non-volatile Digital Potentiometers With Up/down 3-wire Interface, 10kohm, 50kohm, 100kohm Resistance 100 Taps Without / With Output Buffer
• Manufacturer: Winbond Electronics Corp America

Resistor position nonlinearity error test
circuit (Rheostat Operation: R-INL, R-DNL)
Potentiometer divider nonlinearity error
test circuit (INL, DNL)
V+
10.1 T
*Assume infinite input impedance
*Assume infinite input impedance
Wiper resistance test circuit
No Connection
*Assume infinite input impedance
WMS71xx
V
EST
V
B
A
V
WMS71xx
R
R
W
C
B
A
V
V
IRCUITS
WMS71xx
R
A
B
V
V
W
MS
W
*
I
R
W
1LSB= V+/99
V+ = V
W
= V
I
V
W
= V
MS
DD
I
W
*
MS
DD
/R
/I
Total
FIGURE 4 – TEST CIRCUITS
W
V
MS
*
- 14 -
Power supply sensitivity test circuit (PSS, PSRR)
V
OFFSET
A
~
W
GND
V
2.5V DC
V
+
IN
V
IN
Gain vs. frequency test circuit
*Assume infinite input impedance
~
Capacitance test circuit
V
V
V
2.5V DC
Offset
B
A
A
WMS71xx
V
WMS71xx
W
V
WMS7170 / 7171
V
WMS71xx
V
PSRR(dB) = 20LOG (
PSS(%/% ) = ' V
V
A
V
V
B
A
+
W
W
= V
= V
DD
DD
+5V
V
r 10%
B
V
' V
+5V
MS
MS
DD
*
V
' V
' V
OUT
V
MS
DD
OUT
)