U3761MB-T Datasheet, PDF (5/27 Pages) ATMEL Corporation – Universal Telephone IC - All Functions Integrated

U3761MB-T
Pin Description
Pin Symbol Function
Configuration
8
XT _{A built-in inverter provides oscillation with an inexpensive}
9
XT ^{3.579545-MHz crystal or ceramic resonator}
Output of DTMF
DTMF output frequency
Specified (Hz) Actual (Hz) Error (%)
R₁ 697 699
10
MFO
R₂ 770
R₃ 852
766
848
R₄ 941 940
C₁ 1209 1216
C₂ 1336 1332
C₃ 1477 1472
+0.28
-0.52
-0.47
-0.10
+0.57
-0.30
-0.34
During the temporary DTMF mode the output switches to
low
11
MFIND _{Reset by on hook condition}
Maximum voltage at MFIND = 5.5 V
12
GND Ground
VDD
XT
VDD
PD
VDD
XT
VDD
PD
MFO
VDD
VDD
PD
VDD
MFIND
PD
MFIND
13
MIC 1 Inverting input of microphone amplifier
14
MIC 2 Non-inverting input of microphone amplifier
4744A–CORD–09/03
MIC1
MIC2
1V
50K
50K
1V
VI
PD
VI
PD
5