Datasheet

       
   
 

SLUS212E − NOVEMBER 1999 − REVISED FEBRUARY 2004
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
Figure 5
POWER SUPPLY REJECTION RATIO (VB INPUT)
vs.
FREQUENCY
PSSR - Power Supply Rejection Ratio (VB Input) − dB
10 M1 M100 k10 k1 k100
0
10
20
30
40
50
60
f − Frequency − Hz
UDG-00085
4
5
1
2
3
ADJ
VOUT
VB
VIN
GND
4.7
µ
F
Tantalum
1
µ
F
Ceramic
100
µ
F
Tantalum
121
Ω
R1
UC385−ADJ
Pulse
Generator
V
O
= 1.2 V
IRF
520
++
5 V
3.3 V
_
+
_
+
Figure 6. Transient Test Circuit