FEDL 7012-03-01
1
Semiconductor
ML7012-03
APPLICATION CIRCUITS
Analog Interface
ML7012
R1
R3
R2
AOUT
–
+
C2
RCI
C1
RCAO
–
+
R4
R5
TXAI
TXAN
–
+
RA
600 Ω: 600 Ω
C3
0.022 µF
LINE
RB ( = RA)
R6
600 Ω
–
+
TXAP
AIN
R7
R8
–
+
GSR
SG
•
The 2nd order LPF should be
built to make fc approximately 5
kHz using the built-in amplifier,
R1 to R3, and C1 and C2.
Numeric examples:
SG Gen.
C4
R1 = R2 = R3 = 68 k Ω
1 µF
C1 = 1000 pF, C2 = 220 pF
When VDD ≥ 3 V, R5/R4 ≤ 2.
When VDD < 3 V, R5/R4 ≤ 1.6.
•
•
19/22