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U4030B PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 U4030B
기능 Telephone Speech Circuit
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U4030B 데이터시트, 핀배열, 회로
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Telephone Speech Circuit
U4030B
Description
The U4030B is an electronic speech circuit for standard
and feature telephones. It replaces the hybrid transformer,
earphone and microphone interface and the supply
voltage generation for external components, e.g. dialer or
microcomputers. Using the U4030B in telephone circuit
designs can improve transmission quality and results in
cost savings through shorter and more flexible design
procedures. It reduces the amount of external components
needed. The U4030B uses TEMIC’s reliable bipolar
technology and is offered in a SO20 package.
Features
D Microphone amplifier with
– Symmetrical input
– Privacy function
– Anticlipping
D Built in ear protection
D Power down input
D Mute input
D DTMF interface
D Low line impedance during pulse dialing
Benefits
D Independent adjustment of
– Transmission gain
– Receiving gain
– Sidetone suppression
– Frequency response
D Low-impedance supply voltage for all external blocks
D Supply voltage for an electret microphone
Applications
D Standard telephone
D Fax machine
D Answering machine
D Cordless telephone
Block Diagram
10
DTMF
PRIV
MIC1
MIC2
16
12
13
GT MICO
11 9
+
ST
5
+
TXA
GR RECO
67
+–
Ear protection
REC.ATT.
4 CK
Limiter
3
CLIM
Mute
8
MUTE
17
PD
Power supply
U 4030 B
14
GND
18 1
SWAMP VM
15 VL
19 RDC
2 VC
20
VD
Figure 1.
Ordering Information
93 7618 e
Extended Type Number
U4030B-AFL
U4030B-AFLG3
Package
SO20
SO20
Remarks
Taped and reeled
Rev. A2, 27-Jan-98
1 (14)




U4030B pdf, 반도체, 판매, 대치품
U4030B
20
Rswamp = 82 68 47
15
10
5
0
0
93 7622 e
RDC = 10 kW
20 40 60 80 100 120
Line current IL ( mA )
Figure 5. Typical DC characteristics for various
SWAMP resistors
Charge Up Circuit
By OFF HOOK the handset, an integrated charge up
circuit provides VD with the whole line current. When VD
reaches 2.2 V, the charge up circuit is automatically
switched off.
The specifications for the German “Deutsche Telekom”
(speech readiness, start time) will be fulfilled even with
1000 m F at Pin 20.
Figure 6 illustrates the transient behavior of the circuit at
IL = 20 mA.
charge-up
VL
off VD
93 7623 e
time: 50 ms / div
Figure 6. Charge up characteristics at IL = 20 mA
Electronic Inductance
The AC resistance ( Rimp 1 kW ) of the telephone should
be much higher than the DC resistance ( 325 W ), the latter
being decoupled via an electronic inductance.
The value of L is given by:
L = CVC RDC 30 kW || R
where
RDC = 10 W
CVC = 10 m F
R30 = 30 kW
RC = infinite
L =3H
Transmit
Microphone amplifier
The microphone amplifier of U4030B has symmetrical
inputs ( MIC1 and MIC2 ) with an input resistance of
60 kW ( typical). It has a gain of 29 dB which is adjustable
with resistances RS1 and RS2 as follows:
GT = VMICO / V ( MIC1, MIC2 )
= 20 log [ (RS1 / RS2 ) + 1 ] dB
A low pass function can be realised with CSLP. The
corner frequency is given by:
fC = 1 / ( 2 p RS1 CSLP )
When the AC level on VL is very high, the amplification
of the microphone is reduced by the limiter function. The
threshold of the limiter is fixed at 5.5 dBm ( typical).
DTMF
The amplification of the DTMF signal is determined by
the ratio of RS1 and RS2 as follows:
GD = VMICO / VDTMF
= 20 log {0.19 [ ( RS1 / RS2 ) + 1 ] }
An external voltage divider is used to adjust the proper
DTMF level at line.
For monitoring the dialing procedure, an attenuated
DTMF signal is sent to the earpiece. The Deutsche Tele-
kom specification is fulfilled with the nominal value of
the transmit and receive gain.
4 (14)
Rev. A2, 27-Jan-98

4페이지










U4030B 전자부품, 판매, 대치품
Electrical Characteristics
f = 1000 Hz, Tamb = 25_ C, reference point Pin 14, unless otherwise specified
Parameters
Test Conditions / Pins
DC characteristics (figure 9)
DC voltage in speech mode IL = 19 mA
IL = 26 mA
IL = 60 mA
Transmit amplifier and sidetone reduction (figure 10)
Input resistance
Transmit gain
Gain variation
Noise at line,
psophometrically weighted
Sidetone gain (figure 10)
Max. output voltage
Common mode rejection
ratio
IL = 24 mA
19 mA x xIL 60 mA
RL = 600 W
ZRECO = 68 nF
ZMIC = 68 nF
IL = 19 to 60 mA
dRLx5%R
VMIC = 5.4 mV
Mute: reduction of
voltage amplification
ZRECO = 68 nF
Privacy: reduction of
voltage amplification
Receiving amplifier (figure 11)
Gain
Gain variation
Noise at earphone
psophometrically weighted
Max. output voltage
ZRECO = 68 nF
IL = 24 mA
19 mA x IL x 60 mA
IL = 19 to 60 mA
Load T, R = 600 W
ZRECO = 68 nF
ZMIC = 68 nF
IL = 19 to 60 mA
xZRECO = 68 nF
d 2%
Switching threshold of ear
protection
IL = 19 to 60 mA
ZRECO = 68 nF
VGEN = 3 Vrms
Voltage amp. from
DTMF to RECO
Zear = 68 nF
Output impedance
Power down (figure 12)
PD-off input voltage
PD-on input voltage
Input current
Line voltage
Input current consumption
VI = 6 V
PD on, IL = 24 mA
PD on
at VD
Symbol
VL
RI
GT
D GT
nO
GST
VOmax
CMRR
GR
D GR
nI
VOmax
VI
VI
II
VL
ID
Min.
6.2
10.0
45.0
44.2
– 0.5
60.0
60.0
– 3.9
– 0.5
600
0.7
–7
2
U4030B
Typ. Max. Unit
6.5 6.8
7.2
10.5 11.0
V
V
V
60.0 80.0 kW
44.7 45.2
dB
+0.5 dB
– 75.0 dBmp
33.5 dB
5.5 6.3 dBm
80.0 dB
dB
dB
– 3.4 – 2.9
dB
0.5 dB
– 78 dBmp
650 mVrms
1.3 Vrms
– 4 – 1 dB
10 W
0.3 V
V
130 m A
1.5 V
100 m A
Rev. A2, 27-Jan-98
7 (14)

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부품번호상세설명 및 기능제조사
U4030B

Telephone Speech Circuit

TEMIC Semiconductors
TEMIC Semiconductors

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