1Semiconductor
FEDL 7012-04-01
ML7012-04
APPLICATION CIRCUITS
Analog Interface
–
+
ML7012
AOUT
RCI
RCAO
–
+
TXAI
R1
C1
R3
C2
R2
R4
–
+ RA
TXAN
RB ( = RA)
–
+
–
+
TXAP
AIN
GSR
SG
SG Gen.
R5
C3
0.022 µF
R6
600 Ω
600 Ω: 600 Ω
LINE
R7
R8
C4
1 µF
• 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:
R1 = R2 = R3 = 68 k Ω
C1 = 1000 pF, C2 = 220 pF
• When VDD ≥ 3 V, R5/R4 ≤ 2.
• When VDD < 3 V, R5/R4 ≤ 1.6.
19/22