TEA1064A/C1 Philips Semiconductors (Acquired by NXP), TEA1064A/C1 Datasheet - Page 10

• Manufacturer Part Number: TEA1064A/C1
• Description: TEA1064A; Low Voltage Versatile Telephone Transmission Circuit With Dialler Interface And Transmit Level Dynamic Limiting
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
The DC line voltage on LN is
Therefore
in which:
The DC voltage V
parameter is shown in Fig.10. In the audio frequency
range, the dynamic impedance is determined mainly by
R1. The equivalent impedance in the audio range of the
circuit (Fig.8) is shown in Fig.11.
March 1994
handbook, halfpage
V LN(p-p)
V
V
V
SLPE (the value of V
resistor, R
I
R15 is an external resistor between LN and V
in the basic application)
R9 is an external resistor between SLPE and
V
Low voltage versatile telephone transmission circuit
with dialler interface and transmit level dynamic limiting
Fig.9
p
As different values of R15 and R16 are allowed, different curves
would then apply
LN
LN
ref
EE
(V)
is the supply current used by peripheral circuits
is the internal reference voltage between V
= V
= V
(20
8
6
4
2
0
10
LN-SLPE
ref
Maximum output swing on line as a function
of line current with the peripheral supply
current as a parameter; R15 = 392 ;
R16 = 56 .
VA
in the basic application)
([I
). V
p
LN-SLPE
ref
(I
0.25
([l
= 3.3 V (typ.) without R
SLPE
line
ref
as a function of I
can be adjusted by an external
10
I
R9).
CC1
20
3
A]
0.25
I line (mA)
R15)
I p = 4 mA
10
2 mA
0 mA
p
MGR064
with R15 as a
VA
3
A]
CC2
30
CC2
(392
R9)
and
10
handbook, halfpage
Fig.10 Curves showing the typical voltage drop
V
changing the value of R
The total voltage drop V
Fig.11 Equivalent impedance between LN and
V LN-SLPE
handbook, halfpage
L
R
CC2-SLPE
eq
eq
(V)
=
=
C3 R9 R
5.5
5.0
4.5
4.0
3.5
3.0
R
between LN and SLPE as a function of the
supply current for peripherals with R15 as a
parameter: V
connected).
p
V
stabilized supply voltage for peripheral
circuits.
can be adjusted between approximately 3.3 and 4.3 V by
0
EE
R15
---------- -
R16
R9
20
L eq
at f
+
1
eq
VA
with R
300 Hz in the application with
LN
1
, this results in a parallel-shift of the curves.
CC2-SLPE
V
R eq
C3
470 nF
p
LN-SLPE
=
15 k
R15 = 511
2
= 3.3 V (R
([I
line
R1
620
MGR066
Product specification
1.55 mA]
TEA1064A
392
3
LN
V EE
VA
I p (mA)
301
not
MGR065
R9).
4