L38812 Просмотр технического описания (PDF) - Unisonic Technologies
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L38812 Datasheet PDF : 8 Pages
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UTC L388 12 LINEAR INTEGRATED CIRCUIT
L388 12
The circuit has a buit in shunt voltage
ID=1mA 15
generator.It needs a minimum 1mA
+V
+ current for its function.The voltage at
this current will be 3.3V.If the voltage
+V is not constant care must be taken
so that the ID will not exeed 10 mA
Figure 4. Circuit supply function
VRxDet
R1=R2=3k
R3=R4=100k
R5=R6
C1=C2
+
R7
R6
R5
C4
C2
C1
Mic.
C3
F2
Ref.
R4
F1 R3
-+
R2
2 R1
3
16
Figure 5. Transmitter channel input amplifier used
to suppress ripple in the mic.supply.(CMRR).
+600
+400
+200
Vref=2V Vref
-200
-400
-600
2.5 5.0 7.5 10
0.5
1.0
1.5
VRxin
mV
p
VTxin
VTxDet
Figure 6. Transmitter and receiver channel
rectifier characteristics.
Txin
TxDetout
NDet
Figure 7. Relationship in timing between
the voltage levels at TxIN,TxDet and NDet
VTxout
(mV)
VRxout
(mV)
500
500
400
400
300
300
200
200
100
100
2.4 2.6 2.8 3.0 3.2 3.4
V+(V)
2.4 2.6 2.8 3.0 3.2 3.4
Figure 8. Transmitter and receiver channel output dynamics.
V+(V)
Transmit
dB
gain=
40
30
VCTR=V+
20
10
0
VCTR=open
Receive
gain=
dB
30
20
VCTR=V+ 10
0
-10
VCTR=open
-20
VCTR = VREF
-60 -40 -20 0 20 40 60
VCMP - VREF
mV
Figure 9. Transmit and reveive gain as a
function of VCMP and VCTR
Rxdet
Txdet
A
B
CMP
EF
Full recieve level
G
CD
Full transmit level
Figure 10. Timing of the transmitter and receiver
channels at the CMP-input
UTC UNISONIC TECHNOLOGIES CO. LTD 7
QW-R108-013,A
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