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BAS11
(2×)
telephone
line
BZW14
(2×)
R10
13 Ω
R16
392 Ω
R1
R2
1
130 kΩ C5
13
LN
IR
100 nF
R3
3.92 kΩ
R4
100 kΩ
C7
4
QR−
R13
5
C4
100 pF
6
1 nF
QR+
GAR
620 Ω
16
VCC
TEA1064B
12
DTMF
MUTE 14
PD 15
9
MIC+
7
DLS/MMUTE
R8
390 Ω
Zbal
R14
8
MIC−
SLPE
GAS1
GAS2
REG
AGC
VEE2 19
STAB VEE1
20 2
C6
R9 100 pF
20 Ω
3
17 18 10 11
R7
68
kΩ
C3
4.7 R6
R5
3.6
µF
kΩ
C1
100 µF
C16
470
nF
+
from dial
and
control circuits
C15
220 µF
−
R17
3.3 kΩ
MBA445
The diode bridge and R10 limit the current into, and the voltage across, the circuit during line transients.
A different protection arrangement is required for pulse dialling or register recall.
Fig.22 Basic application of TEA1064B with SLPE as supply reference for peripherals, shown here with piezo-electric earpiece and
DTMF dialling.