pbl388121so ETC-unknow, pbl388121so Datasheet - Page 7

• Manufacturer Part Number: pbl388121so
• Description: Voice-switch Circuit Handsfree Speakerphone
• Manufacturer: ETC-unknow

Figure 8. Transmitter and receiver
channel rectifier characteristics.
Figure 9. Relationship in timing between
the voltage levels at Tx
Figure 7. Transmitter channel input
amplifier used to suppress ripple in the
mic. supply. (CMRR).
R1 = R2
R3 = R4
R5 = R6
C1 = C2
Figure 10. Transmitter and receiver
channel output dynamics.
3k
100k
In
, Tx
Det
and N
Det
500
400
300
200
100
V
Txout
(mV)
2.4
2.6
2.8
+
3.0
R7
C4
+600
+400
+200
R5
3.2
R6
TxDetout
N Det
Txin
3.4
Mic.
0.5
V+ (V)
C3
C2
C1
500
400
300
200
100
1.0
2
3
R4
R2
V
(mV)
R
xout
2.4
R1
-
1.5
2.6
F
F
1
2
+
16
2.8
Ref.
R3
3.0
PBL 388 12
3.2
3.4
V+ (V)
7