Philips Semiconductors
Low voltage versatile telephone transmission circuit
with dialler interface and transmit level dynamic limiting
Product specification
TEA1064A
R16
56 Ω
Ip
R15
392 Ω
R1
Iline
R2
620 Ω
100 nF
130 kΩ
19 16
1
2
S1 13 VCC2 VCC1
IR
1
LN
QR− 4 10 µF
C1
100
µF
R3
3.92 kΩ
C15
220
130 Ω
µF
10
µF
Vi
R8
390
Ω
9
MIC+
8
MIC−
12
DTMF
TEA1064A
14
MUTE
15
PD
7
DLS/MMUTE
VEE
REG
11
17
AGC
18
STAB
10
QR+ 5
GAR 6
2
GAS1
3
GAS2
SLPE
20
ZT Vo
R4
C4
100
100 pF
kΩ
C7 1 nF
R7
68
kΩ
C6
100 pF
820 220
Ω
nF
C16
470 nF
C3
R5
470
R6
3.6
R9
nF
kΩ
20 Ω
100 µF
RL
600 Ω
11 to
140 mA
MGR077
Fig.23 Test circuit for defining voltage gain of the receiving amplifier, voltage gain (Gv) is defined as
20 log Vo / Vi (with S1 in position 1).
APPLICATION INFORMATION
The basic application circuit is shown in Fig.24 and some typical applications are shown in Figs 25, 26 and 27.
In the basic application, the circuit provides two possibilities for supplies to peripheral circuits:
• regulated line voltage VLN (stabilized VLN-SLPE) and unregulated supply voltage for peripheral circuits, the supply
voltage is dependent only on the peripheral supply current. This application is the same as that used for
TEA1060/TEA1061, TEA1067 and TEA1068;
• stabilized supply voltage for peripherals (VCC2-SLPE), the DC line voltage depends on the current flowing to the
peripheral circuits.
March 1994
25