Datasheet

AD8436 Data Sheet
Rev. B | Page 16 of 24
10033-200
AC IN
VCC
VEE
DC
OUT
10MΩ
VEE
CAVG VCC
OBUFOUT
IGND
OBUFIN+
OBUFIN–
OBUFV+
OUTDNC
IBUFIN–
IBUFOUT
IBUFIN+
SUM IBUFV+
1
4
3
2
5
876 9
12
11
10
16
15
14
13
10µF
0.47µF
OGNDIBUFGN
CCF
470pF
CAVG
10µF
+
19 18 1720
DNC
RMS
CLPF
3.3µF
0.1µF
AD8436
CAPACITOR CLPF, IN CONJUNCTION WITH
THE INTERNAL 16kΩ OUTPUT RESISTOR
FILTERS THE RECTIFIED OUTPUT, YIELDING
THE AVERAGE-RECTIFIED VALUE.
CAPACITOR CAVG COMPUTES THE
MEAN IN THE IMPLICIT RMS
EXPRESSION. FOR SMALL VALUES
OF CAVG, THE AC INPUT WAVEFORM
WILL STILL BE FULLY RECTIFIED AND
APPEAR AT THE OUTPUT.
DISCONNECTING CAVG DEFAULTS THE
COMPUTED RESULT TO AVERAGE-VALUE.
A MINIMUM OF 470pF CAPACITANCE IS
REQUIRED TO MAINTAIN STABILITY
Figure 41. Configuration for Average Rectified Value