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U4030B 반도체 회로 부품 판매점

Telephone Speech Circuit



TEMIC Semiconductors 로고
TEMIC Semiconductors
U4030B 데이터시트, 핀배열, 회로
www.DataSheet4U.com
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 데이터시트, 핀배열, 회로
U4030B
Pin Description
VM 1
VC 2
CLIM 3
CK 4
ST 5
GR 6
RECO 7
MUTE 8
MICO 9
DTMF 10
20 VD
19 RDC
18 SWAMP
17 PD
16 PRIVACY
15 VL
14 GND
13 MIC2
12 MIC1
11 GT
95
Pin Symbol
Function
1 VM Supply voltage for an elecret
microphone, virtual ground
2 VC The internal inductance of the
circuit is proportional to the
value of the capacitor at this pin.
A resistor connected to ground
may be used to reduce the line
voltage
3 CLIM Time constant of anticlipping in
trans. path
4 CK Input of receive amplifier
5 ST Input of sidetone amplifier, must
be DC-coupled to VM
6 GR Input for receive gain control
7 RECO Output of receiving amplifier
8 MUTE Active high input to switch
circuit in DTMF-condition
9 MICO Output of microphone amplifier
Pin Symbol
Function
10 DTMF Input for DTMF signals (AC-
coupled). In mute condition a
small portion of the signal at this
pin is monitored to the receive
output
11 GT Input for transmit gain control
12 MIC1 Inverting input of microphone
amplifier
13 MIC2 Non-inverting input of
microphone amplifier
14 GND Ground (reference point for DC
and AC signals)
15 VL Line voltage
16 PRIVACY Active high input to disable
microphone amplifier
17 PD Power down input. Active high
input for reducing the current
consumption of the
circuit. Simultaneously VL is
shorted by an internal switch
18 SWAMP A resistor connected from this
point to ground converts the
excess line current into heat in
order to prevent the IC from
thermal destruction at high line
currents
19 RDC Input of power supply
20 VD Unregulated supply voltage for
peripheral circuits. Output
current capability and output
voltage increase with line current
2 (14)
Rev. A2, 27-Jan-98




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U4030B

Telephone Speech Circuit - TEMIC Semiconductors