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L38812 데이터시트 PDF




Unisonic Technologies에서 제조한 전자 부품 L38812은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 L38812 기능
기능 LINEAR INTEGRATED CIRCUIT
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L38812 데이터시트, 핀배열, 회로
UTC L388 12 LINEAR INTEGRATED CIRCUIT
VOICE-SWITCH CIRCUIT FOR
HANDSFREE SPEAKERPHONE
TAM
DESCRIPTION
The UTC L388 12 contains all the necessary circuitry,
amplifiers, detectors, comparators and control functions to
implement a high performance, voice-switched, ”hands-free”
function in an answering machine.
The UTC L 388 12 is designed for answering machines
that are either powered from the telephone line or from a
mains powered dc. supply.
Filtering of both the audio and control signals in both
transmitter and receiver channels possible.
An external loudspeaker amplifier has to be used, normally
the same as used for the answering machine.
FEATURES
*Settable gain dynamics (25 or 50dB)
*Low power consumption, totally 1.0mA at 3.3V typical.
*Background noise compensation in the transmitting channel
*with hold function.
*Excellent noise performance.
*Both channel input amplifiers have balanced inputs.
*Minimum of external components needed for function.
PIN CONFIGURATION
16-pin SO package
CTR 1
-Txin 2
+Txin 3
F2out 4
Txout 5
TxDetin 6
TxDetout 7
NDet 8
16 GND
15 +V
14 -Rxin
13 F5out
12 Rxout
11 RxDetin
10 RxDetout
9 CMP
SOP-16
DIP-18
18-pin DIP package
F2out 1
Txout 2
TxDetin 3
TxDetout 4
N Det 5
CMP 6
RxDetout 7
Rx Detin 8
Rxout 9
18 +Txin
17 -Txin
16 CTR
15 NC
14 GND
13 +V
12 -Rxin
11 +Rxin
10 F5out
UTC
UNISONIC TECHNOLOGIES CO. LTD 1
QW-R108-013,A




L38812 pdf, 반도체, 판매, 대치품
UTC L388 12 LINEAR INTEGRATED CIRCUIT
PARAMETER
TEST CONDITIONS
+TxIn input impedance
-TxIn input impedance
-RxIn input impedance
Txout ac, load impedance
Rxout ac, load impedance
F2out ac, load impedance
F5out ac, load impedance
Transmitter channel output swing, VTXOut 2% distortion, RTxout=RRxout=25 kΩ
Receiver channel output swing, VRxOut 2% distortion, RTxout=RRxout=25 kΩ
Transmitter output noise, VTxOut
VCMP=VRef-0.1V,vTXIn=0V
Receiver output noise, VRxOut
VCMP=VRef+0.1V,vRXIn=0V
TxDet sink current, ITxDetOut
VtxDetIn=VRef+0.1V
RxDet source current, IRxDetOut
VRxIn=VRef-0.1V
TxDet source current, ITxDet
VCMP=VRef-0.1V
RxDet sink current, IRxDetOut
VRxDetIn=VRef+0.1V
TxDet swing relative to VRef, VTxDetOut
VTxDetIn=VRef+0.1V
RxDet swing relative to VRef, VRxDetOut
VRxDetIn=VRef-0.1V
NDet sink current (fast charge), INDet
VTxDetIn=VRef-0.1V
VCMP=VRef-0.1V
NDet source current, INDet
VTxDetIn=VRef+0.1V
VCMP=VRef+0.1V
NDet Ieakage current(hold),INDet
VTxDetIn=VRef-0.1V
VCMP=VRef+0.1V
NDet swing relative to VRef,VNDet
VCMP=VRef-0.1V
VTxDetIn=VRef+0.1V
CMP(comparator) sensitivity,
Tx mode=max Tx gain,
Transmit(Tx) mode to receive
Rx mode=max Rx gain
(Rx) mode or vice versa
CTR voltage for 25 dB dynamics,VCTR VCMP=VRef+0.35V,RCTR=100kΩ
CTR voltage for mute,ICTR
VCMP=VRef+0.35V
CTR voltage for disable,VCTR
MIN TYP
80 100
2.4 3.0
16 20
10
10
10
10
500
500
-75
-75
-6.0
2.5 6.0
-30
(note 2)
(note 2)
-0.7
+0.7
-4.5
MAX
120
3.6
24
-2.5
30
-1.5
UNIT
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
mVp
mVp
dBpsof
dBA
mA
mA
μA
μA
V
V
mA
3 5 7 μA
-100
nA
-0.45
V
50 100 mV
V+ V
μA
0.55 V
Notes:
1. 20· log (
VNDet-VRef
)
VTxDet-VTxDetO
VNDet=voltage at noise detector output
VRef=reference voltage (about 1.9V)
VTxDet=Voltage at transmit detector output
VTxDetO=voltage at transmit detector at the point
when the voltage at the noise detector starts
moving when a signal at transmit channel input is
gradually increased (threshold, typical value 30 mV)
2. Depends on V+. Channels are tracking.
UTC
UNISONIC TECHNOLOGIES CO. LTD 4
QW-R108-013,A

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L38812 전자부품, 판매, 대치품
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
VCTR=V+
20
10
0
VCTR=open
-10
-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
AB
CMP
EF
Full recieve level
CD
Full transmit level
G
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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L38812

LINEAR INTEGRATED CIRCUIT

Unisonic Technologies
Unisonic Technologies
L38812

LINEAR INTEGRATED CIRCUIT

Unisonic Technologies
Unisonic Technologies

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