U4050B TEMIC Semiconductors, U4050B Datasheet - Page 3

• Manufacturer Part Number: U4050B
• Description: Speech Circuit
• Manufacturer: TEMIC Semiconductors

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Rev. A2, 05-Mar-98
Pin Description
Pin
10
1
3
2
4
5
6
7
8
9
RECO2
GR
RECO1
ST
CLIM
CK
MICO
DTMF
GS
MIC1
MIC2
LEVSQ
CSQ
VM
RECO2,
RECO1
Symbol
DTMF
MICO
CLIM
MIC1
GR
CK
GS
ST
Figure 3. Pinning S028
10
12
13
14
11
1
2
3
4
5
6
7
8
9
Symmetrical outputs of receiving
amplifier
A resistor connected from this pin to
V
amplification at the circuit
Input of sidetone amplifier
Time constant of anticlipping in trans-
mit patch
Input of receiving path
Output of microphone preamplifier
Input for DTMF signals (ac coupled).
In Mute condition a small portion of
the signal at this pin is monitored to
the receiver output.
A resistor from this pin to V
amplification of microphone and
DTMF signals.
Inverting input of microphone ampli-
fier
M
(AC coupled) sets the receiving
Function
19
18
17
16
15
26
25
24
23
22
28
27
21
20
SWAMP
IREF
AGA
GSA
PD
VC
VL
GND
CLISA
TIN
SAO
VD
RDC
MUTE
M
sets the
14052
Pin
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
SWAMP
LEVSQ
Symbol
CLISA
MUTE
MIC2
GND
AGA
RDC
IREF
CSQ
SAO
GSA
TIN
VM
VD
VC
VL
PD
Non-inverting input of microphone
amplifier
Input for setting the switching level of
the squelch circuit
Time constant of the squelch function
Reference node for microphone, ear-
phone and loudspeaker amplifier.
Supply for electret microphone set to
V
Input of intermediate transmit stage
Active high input to switch the circuit
into DTMF condition.
Time constant of anticlipping of
speaker amplifier.
A resistor connected from this pin to
ground converts the excess line cur-
rent into heat in order to prevent the
IC from thermal destruction at high
line currents
A small resistor connected from this
pin to V
teristic and also affects the line length
equalization characteristics and the
line current at which the loudspeaker
amplifier is switched on.
Unregulated supply voltage for pe-
ripheral circuits (dialers, microproces-
sors, etc.). Output current capability
and output voltage increase with line
current.
Output of loudspeaker amplifier.
Reference point for DC and AC out-
put signals
Line voltage
The internal equivalent 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.
Active high input for reducing the
current consumption of the circuit.
Simultaneously V
internal switch.
Current input for setting the gain of
the speaker amplifier
Automatic gain adjustment with line
current. A resistor connected from this
pin to V
Maximum gain change is 6 dB.
Internal reference current generation
D
/2.
L
L
sets the slope of the charac-
sets the starting point.
Function
U4050B
L
is shorted by an
3 (18)