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PDF U4050B Data sheet ( Hoja de datos )
| Número de pieza | U4050B | |
| Descripción | Speech Circuit | |
| Fabricantes | TEMIC Semiconductors | |
| Logotipo |  |
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U4050B
Speech Circuit with Line-Powered Loudspeaker Amplifier
Description
The electronic speech circuit U4050B is a linear
integrated circuit for use in telephone sets. It replaces the
hybrid transformer, sidetone equivalent and ear
protection rectifiers.
The circuit is line powered and contains all components
necessary for amplification of signals and adaptation to
the line. An integrated loudspeaker amplifier allows
loudhearing operation.
Features
www.DataSheet4U.cDomIntegrated amplifier for loudhearing operation
D Anticlipping for loudspeaker amplifier
D Supply voltages for all functional blocks of a
subscriber set
D Adjustable DC characteristics
D Adjustable sending and receiving amplification
D Automatic line loss compensation
D Symmetrical output of earpiece amplifier
D Built-in ear protection
D Symmetrical input of microphone amplifier
D Adjustable sidetone suppression independent
of sending and receiving amplification
D DTMF and MUTE inputs
D Anticlipping in transmit direction
D Squelch
D Integrated transistor for short circuiting the line
voltage
D Power down
D Operation possible at line currents above 10 mA
Benefits
D Independent adjustment of transmit gain, receive gain
and sidetone suppression
D Low number of external components
Block Diagram
GS MICO TIN ST GR RECO1
RECO2
8
DTMF
MIC1
MIC2
10
11
9 7 15 4
+
––
+
23
–
+
SAI
1
26 GSA
SA
21 SAO
12
LEVSQ
CSQ 13 SQUELCH
TXA
AGA
LIMSA
REC. ATT.
17 CLISA
AGA
27
6 CK
LIMITER
5
CLIM
MUTE
16
MUTE
Power supply
NSA U4050B
25 22 28 18 14
PD GND IREF SWAMP VM
Figure 1. Block diagram
20
VD
23 VL
19 RDC
24 VC
Ordering Information
Extended Type Number
U4050B-AFL
U4050B-AFLG3
Package
SO28
SO28
Remarks
Taped and reeled
Rev. A2, 05-Mar-98
1 (18)
1 page  
U4050B
Parameters
Test Conditions / Pins Symbol Min. Typ. Max. Unit
Gain at low operating
current
IL = 10 mA, ID = 1 mA
RC = 68 kΩ
Vmic = 1 mV IM = 0 mA
GS 47
50 dB
Distortion at low
IL = 10 mA, IM = 0 mA
operating current
ID = 1 mA, RC = 68 kΩ
ds
6%
Vmic = 10 mV
Line loss compensation
IL = 100 mA
D GSI
–5
–6
–7
dB
Mute suppression
wRAGA = 7.5 kΩ
IL 15 mA
GSM
60
dB
Vmute = 1.5 V
www.DataSheet4U.cRomeceiving amplifier
Adjustment range of
receiving gain
see figures 6 and 8
wIL 15 mA
GR
differential
–8
+8 dB
Receiving amplification
Amplification of DTMF
signal from DTMF IN
to RECO 1/2
Frequency response
Gain change with current
Gain deviation
Ear protection
differential
Output resistance
IL = 15 mA
differential
wIF 15 mA
Mute active
IL > 15 mA, CL = 4.7 nF
f = 300 to 3400 Hz
IL = 15 to 100 mA
Tamb = –10 to + 60°C
wIL = 15 mA
IL 15 mA
Vgen = 11 Vrms
Each output
against GND
GR
GRM
–1
– 15
D GRF
D GR
D GR
– 0.5 0
– 12 – 9
" 0.5
" 0.5
" 0.5
dB
dB
dB
dB
dB
Vep 2.2 Vrms
Ro 10 Ω
Line loss compensation
Output voltage
Push pull
Single ended
Receiving noise
psophometrically
weighted
Gain at low operating
current
IL = 100 mA
vRAGA = 7.5 kΩ
IL = 15 mA, d 2%
ZH = 68 nF
ZH = 450 Ω
ZH = 150 Ω
ZH = 68 nF
GR = 0 dB
IL > 15 mA
IL = 10 mA
ID = 1 mA
IM = 0 mA
Vgen = 560 mV
RC = 68 kΩ
D GRI – 5.0 – 6.0 – 7.0
dB
0.775
0.6
0.3
Vrms
ni – 83
– 78.5 dBmp
GR – 1.5
+ 0.5
dB
Distortion at low
operating current
IL = 10 mA, ID = 1 mA
Vgen = 560 mV
RC = 68 kΩ
dr
5%
Rev. A2, 05-Mar-98
5 (18)
5 Page 
www.DataSheet4U.com
U4050B
Rev. A2, 05-Mar-98
Figure 7. Test circuit for speaker amplifier
11 (18)
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet U4050B.PDF ] | |
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