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U3761MB-AFNG3 Schematic ( PDF Datasheet ) - TEMIC Semiconductors

Teilenummer U3761MB-AFNG3
Beschreibung Low Voltage Standard Telephone Circuit with 13 Memories
Hersteller TEMIC Semiconductors
Logo TEMIC Semiconductors Logo 




Gesamt 23 Seiten
U3761MB-AFNG3 Datasheet, Funktion
U3761MB
Low Voltage Standard Telephone Circuit with 13 Memories
Description
TEMIC’s low voltage telephone circuit, U3761MB
performs all the speech and line interface functions
required in an electronic telephone set, the tone ringer, the
pulse and DTMF dialing with redial, notice function, and
13 memories.
Features
Speech Circuit
D Adjustable DC characteristic
D Symmetrical input of microphone amplifier
D Receiving amplifier for dynamic or
piezo-electric earpieces
D Automatic line loss compensation
Dialer
D DTMF / pulse switchable
D Pulse dialling 66/33 or 60/40 or DTMF dialling
selectable by pin
D Selectable flashing duration by key pad
D Pause function
D Last number redial up to 32 digits
D Three by 32 digits direct (one touch) memory
D Ten by 16 digits indirect (two touch) memory
D Notice function up to 32 digits
D Standard low-cost crystal 3.57 MHz or
ceramic resonator
Tone Ringer
D 2 Tone ringer
D Adjustable volume
D RC oscillator
D Adjustable threshold
Benefits
D Low number of external components
D High quality through one IC solution
TELEFUNKEN Semiconductors
Rev. A2, 23-Apr-97
Preliminary Information
1 (23)






U3761MB-AFNG3 Datasheet, Funktion
U3761MB
SDIP40 SSO44
14 17
16 18
17 19
18 20
19 21
20 22
22 24
21 23
Symbol
RDC
TIN
VI
MUTE
VBG
RECIN
RECO1
RECO2
Configuration
AGC
ÊÊVL
RDC
TIN
PD
PD
ÊÊ5.6K
ÊÊ16V
ÊÊPD
1V
Ê
VI
16V
PD
MUTE
VBG
REC IN
6.7V
PD
6.7V
PD
Ê30K VBG
MUTE
ÊÊÊVL
Ê60K
RECO2
RECO1
Ê ÊVL
Ê ÊÊ60K 1V
Function
An external resistor (1 W) is
required from this pin to GND to
control the DC input impedance of
the circuit. It has a nominal value
Wof 39 for low-voltage operation.
WValues up to 100 may be used to
increase the available transmit
output voltage swing at the expense
of low-voltage operation.
Input to the line output driver am-
plifier. Transmit AGC applied to
this stage.
This internal voltage bias line must
be connected to VL via an external
resistor, RB, which dominates the
WAC input impedance of the circuit
and should be 680 for an 600
input impedance or 1.2 kfor a
900 input impedance.
Pin for testing
Pin for test mode
Receive amplifier input. The
receiving amplification is regulated
by an AGC.
Output of the receive amplifier.
Dynamic transducers with a
Wminimum impedance of 100 can
be directly driven by these outputs.
RECO2
RECO1
6.7V
ÊÊPD
ÊVL
ÊÊ60K 1V
6.7V
PD
6 (23)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A2, 23-Apr-97

6 Page









U3761MB-AFNG3 pdf, datenblatt
U3761MB
HKS
KEY IN
DP
T/P MUTE
MASK
DTMF
OSC
tKRD
R/P
tK10
MB
tPDP
t tOHD
MB
tIDP
tIDP
Low
Oscillation
Figure 4. Pulse mode auto dialing
13404
HKS
KEY IN
DTMF
T/P MUTE
MASK
DP
OSC
3 42
tKID
tTD tITP tITP
High
Oscillation
Figure 5. DTMF mode normal dialing
tKRD
5
tITP
Oscillation
13405
12 (23)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A2, 23-Apr-97

12 Page





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