Features: Speech Circuit· Adjustable dc characteristic· Symmetrical input of microphone amplifier· Receiving amplifier for dynamic or piezo-electric earpieces· Automatic line-loss compensation· Selectable flashing duration by key pad· Pause function· Last number redial up to 32 digits· Standard lo...
U3760MB: Features: Speech Circuit· Adjustable dc characteristic· Symmetrical input of microphone amplifier· Receiving amplifier for dynamic or piezo-electric earpieces· Automatic line-loss compensation· Sele...
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Speech Circuit
· Adjustable dc characteristic
· Symmetrical input of microphone amplifier
· Receiving amplifier for dynamic or piezo-electric earpieces
· Automatic line-loss compensation
· Selectable flashing duration by key pad
· Pause function
· Last number redial up to 32 digits
· Standard low-cost 3.58-MHz crystal or ceramic resonator
Dialer
· DTMF / pulse switchable
· Pulse dialing 66/33 or 60/40 for 10 ppS and 20 ppS or DTMF dialing selectable by pins
· Key tone
Tone Ringer
· Two-tone ringer
· Adjustable volume
· RC oscillator
· Adjustable threshold
Parameters |
Symbol |
Value |
Unit |
Line current |
IL |
140 |
mA |
DC line voltage |
VL |
14 |
V |
Junction temperature |
Tj |
+125 |
°C |
Ambient temperature |
Tamb |
25 to +75 |
°C |
Storage temperature |
Tstg |
55 to +150 |
°C |
Total power dissipation, Tamb = 60°C SSO44 SDIP40 |
Ptot
|
0.9 |
W
|
1.3 | |||
Junction ambient SSO44 SDIP40 |
RthJA |
70 |
K/W
|
50 |
TEMIC's low-voltage telephone circuit, U3760MB, performs all the speech and line interface functions required in an electronic telephone set tone ringer, pulse and DTMF dialing with redial. Electrostatic sensitive U3760MB. Observe precautions for handling.