X9279 Xicor, X9279 Datasheet - Page 21

• Manufacturer Part Number: X9279
• Description: Single Digitally-Controlled (XDCP) Potentiometer
• Manufacturer: Xicor

X9279
Application Circuits (continued)
REV 1.1.7 2/6/03
V
V
S
S
R
Function Generator
Inverting Amplifier
1
R
R
frequency ∝ R
amplitude ∝ R
V
-1/2 ≤ G ≤ +1/2
V
G = - R
1
3
O
O
Attenuator
= G V
= G V
R
R
2
4
2
/R
S
S
1
R
–
+
A
1
1
–
+
, R
, R
= R
–
+
R
2
B
, C
2
2
= R
3
}
}
= R
R
R
A
B
4
= 10kΩ
V
O
V
O
www.xicor.com
R
2
R
1
Z
V
V
IN
S
S
Z
IN
= R
Equivalent L-R Circuit
C
(R
1
2
–
+
C
1
+ s R
R
+ R
Characteristics subject to change without notice.
G
fc = 1/(2πRC)
C
O
3
2
) >> R
Filter
= 1 + R
(R
R
R
1
3
1
+ R
2
R
2
3
1
/R
R
+
–
) C
2
1
1
+
–
= R
2
R
+ s Leq
2
V
O
21 of 24