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TEA1064A датащи(PDF) 10 Page - NXP Semiconductors

номер детали TEA1064A
подробное описание детали  Low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1064A датащи(HTML) 10 Page - NXP Semiconductors

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March 1994
10
Philips Semiconductors
Product specification
Low voltage versatile telephone transmission circuit
with dialler interface and transmit level dynamic limiting
TEA1064A
The DC line voltage on LN is
VLN =VLN-SLPE + (ISLPE × R9).
Therefore
VLN =Vref + ([Ip + 0.25 × 10−3 A] × R15) +
([lline − ICC1 − 0.25 × 10−3 A] × R9)
in which:
Vref is the internal reference voltage between VCC2 and
SLPE (the value of Vref can be adjusted by an external
resistor, RVA). Vref = 3.3 V (typ.) without RVA
Ip is the supply current used by peripheral circuits
R15 is an external resistor between LN and VCC2 (392 Ω
in the basic application)
R9 is an external resistor between SLPE and
VEE (20 Ω in the basic application)
The DC voltage VLN-SLPE as a function of Ip with R15 as a
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.
Fig.9
Maximum output swing on line as a function
of line current with the peripheral supply
current as a parameter; R15 = 392
Ω;
R16 = 56
Ω.
As different values of R15 and R16 are allowed, different curves
would then apply
handbook, halfpage
10
8
4
6
2
0
20
30
MGR064
Iline (mA)
VLN(p-p)
(V)
Ip = 4 mA
2 mA
0 mA
Fig.10 Curves showing the typical voltage drop
between LN and SLPE as a function of the
supply current for peripherals with R15 as a
parameter: VCC2-SLPE = 3.3 V (RVA not
connected).
VCC2-SLPE can be adjusted between approximately 3.3 and 4.3 V by
changing the value of RVA, this results in a parallel-shift of the curves.
The total voltage drop VLN ≈ VLN-SLPE + ([Iline − 1.55 mA] × R9).
handbook, halfpage
012
4
5.5
3.0
5.0
MGR065
3
4.0
4.5
3.5
Ip (mA)
VLN-SLPE
(V)
R15 = 511
392
301
Fig.11 Equivalent impedance between LN and
VEE at f > 300 Hz in the application with
stabilized supply voltage for peripheral
circuits.
R
eq
R
p
R15
R16
-----------
1
+


=
L
eq
C3
R9
×
R
eq with Rp
15 k
=
×
=
handbook, halfpage
MGR066
R9
20
LN
C3
470 nF
Req
Leq
VEE
R1
620


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