FS9952_LP2

1uF

1uF

DC-TO-DC

10uF

9~12V

V+

V-

31 VDD

30 AGND

29 VSS

FS9952

Diagram 21 9V〜12V Power Supply

AC Rectification Circuit

Diagram 22 is the average rectification circuitry of FS9952_LP2. In the circuit, AC signals enter IC through R23,

and then in the process of voltage division through R23, R22, R21, R20 and R19. The divided AC signals come

out from OP1O pin and enter IC through ADIP pin and ADIN pin after rectification. VR1 can adjust the signal

size to be the calibration of AC measurement.

200mV mode is amplified 10 times through OP.

Diagram 23 is the peak value rectification circuitry. Diagram 24 is the true valid value rectification circuitry. The

user can determine by oneself according to the need to select which rectification circuit to use.

+

_

+

-

+

-

R5

10k

R8

90k

R12

28.5k

R13

22k

R11

22k

D1

D2

R24

100k

R25

100k

To DIGIT Part

To ADC V+

To ADC V+

To ADC V-

INL

INH

AD1P

AD1N

OP2O

OP2N

OP2P

OP1O

OP1N

VR1

2k

C13

27nF

C12

27nF

C9

0.47uF

C10

0.47uF

C6

4.7uF

23

164

62

63

61

FS9952

Diagram 22 Average Rectification Circuit

Rev. 1.2

25/34