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PDF TEA7063FP Data sheet ( Hoja de datos )
| Número de pieza | TEA7063FP | |
| Descripción | SPEECH CIRCUIT WITH POWER MANAGEMENT | |
| Fabricantes | ST Microelectronics | |
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TEA7063
SPEECH CIRCUIT WITH POWER MANAGEMENT
PRELIMINARY DATA
2/4 WIRES INTERFACE WITH
- double antisidetone network
- AC impedance externally programmable
- Rx output dynamic programmable
- AGC attack-disconnect points programmable
ANTI-CLIPPING/ANTI DISTORTION CIRCUIT
PROGRAMMABLE
DTMF INTERFACE
3.3 VOLTS SUPPLY FOR MICROPROCES-
SOR OR DIALER
EXTRA CURRENT SUPPLY PROGRAMMA-
BLE FOR LOUD SPEAKER
DC CHARACTERISTIC PROGRAMMABLE
FOR ALL SPECIFICATION
LOW CURRENT OPERATION
DIP20
SO20
ORDERING NUMBERS:
TEA7063FP
TEA7063DP
DESCRIPTION
The TEA7063 is designed to meet the different
BLOCK DIAGRAM
worldwide specifications for telephone set in me-
dium and high range equipments.
January 1994
1/15
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1 page  
CIRCUIT DESCRIPTION
1. DC CHARACTERISTICS
1.1 VC (pin 17)
The stabilized voltage VC is connected to Vline
(pin 16) through an internal shunt regulator T1,
T2, which presents to the line a high AC imped-
ance at frequecncies higher than 200Hz. At this
purpose the value of C1 (at pin 17) must be not
lower than 47µF (suggested value is 100µF).
The shunt regulator, T1 and T2, also controls the
extra current source, or power management, at
pin 12 (see also paragraph 6).
1.2 VLINE (pin 16)
The line voltage (pin 16) is determined by the
value of the external resistor R6 and by the inter-
nal current, Iint, flowing between VC (pin 17) and
Figure 1
TEA7063
Ground (see also paragr.: 1.1):
VLINE = VC + R 6 x Iint
VC is fixed by design at about 2.5V.
Iint is reversely related to R9:
Iint = 8 Volt/R9 + 60µA at IL > 25mA
Iint = 4 Volt/R9 + 60µA at IL = 6mA
where IL depends on ILB (see supply manage-
ment)
VLINE must be externally adjusted (with R6) to
guarantee both DC and AC characteristic in ac-
cordance to the specific standard of the different
adminastrations.
Another adjustment of the DC characteristic is
possible with R9. Increasing the value of R9
causes a decrease of Iint and consequently a re-
duction of the product Iint x R9. (see also Para-
graph 7)
Figure 2
5/15
5 Page 
TEA7063
7. INTERNAL DESCRIPTION OF CURRENT
MANAGEMENT
7.1 Internal Power Supply Management
R9 fixes the line power supply management.
R9 fixes the values of: Iear, Iup, Iref and ILS.
A current line information is used to modifie the
values of Iear, Iup, Iref and ILS between a minimum
and a maximum values.
On Fig 10:
The transmit output stage is represented by a cur-
rent source (Itr). The Itr value depends of the DC
voltage on VLINE (pin 16) and RZAC value.
The other internal stages connected to VLINE (pin
16) are represented by a constant 1.3mA current
source.
7.2 DC Characteristics (internal)
The DC characteristic is equals to:
VLINE (pin 16) = VC (pin 17) + R6 • Iint
Iint is the sum of all the current sources con-
nected on VC (pin 17):
[Ip + Iref + Vpin17 / (r7 + r8)]
- Ip is the bias internal operational amplifiers
power supply.
- Iref = 1 / 3 • (Vrefi / R9); with Vrefi = 470mV
- Iref = 156 / R9 mA
The current line information changes Iint value;
at low line current (6mA): Iint = 4V / R9 + 60µA
at low line current (IL = ILb): Iint =8V / R9 + 60µA
7.3 Microcontroller Supply (internal)
Iup = [(p2 / r2) • Iref + 0.3] mA = [(p2 / r2) • 156 /
R9) + 0.3] mA
The current line information changes p2/r2 value;
at low line current (6mA): p2 / r2 = 70
at a line current (IL = ILb): p2 / r2 = 820
7.4 Earphone Current Supply (internal)
Iear = (p1 / r1) • Iref mA = (p1 / r1) • (156 / R9) mA
The current line information changes p1/r1 value;
at low line current (6mA): (p1 / r1) = 200
at a line current (IL = ILb): p1 / r1 = 2700
The maximum peak dynamic on the earphone is:
Vpear = Zear • Iear
7.5 Transmit Output Stage (internal)
The output stage bias current depends of the DC
voltage on pin 16 and on RZAC impedance.
0.1425
Itr =
•
VLINE
RZ
−
0.517
(RZ is the resistor
connected betwee pin3 and the ground)
7.6 Loudspeaker Current Source (internal)
The current source for external peripherals has
two slopes:
- First slope; before Iear, Iup, Itr and Iint are stabi-
lized at their maximum values: (IL = ILb)
ILS = 0.285 • IL
- Second slope; after Iear, Iup, Itr and Iint are sta-
bilized at their maximum values: (for IL > ILb)
∆ (ILS) = 0.91 • ∆(ILINE
Iear, Iup, Itr and Iint are stabilized at their maximum
values between 16 and 26mA, the absolute IL
value depends of R9 value. The line current (ILb)
where Iear, Iup, Itr, Iint are stabilized at their maxi-
mum values and where the slope of ILS change
is:
ILb = Iear
+
Iup
+ Itr +
0.715
Iint
+
1.3
7.7 Numerical Example
1) R9 = 100KΩ; R6 = 25KΩ
♦ DC characteristic = 6V for Iint max:
= 5V for Iint min:
Iint min (IL = 6mA) = 4 /100K + 60 = 100µA
Iint min (IL = ILb) = 8 /100K + 60 = 140µA
Vpin17 = 2.5V ⇒ R6 = 25KΩ ⇒
Vpin16 min (IL = 6mA) = 2.5 + 25 • 100E - 3 = 5V
Vpin16 max (IL = ILb) = 2.5 + 25 • 140E - 3 = 6V
♦ Current Sources
Iup min (IL = 6mA) = 0.4mA
Iup max (IL = ILb) = 1.6mA
Iear min (IL = 6mA) = 0.3mA
Iear max (IL = ILb) = 4.2mA
with RZ = 75Ω
Itr min (IL = 6mA) = 2.6mA
Itr max (IL = ILb) = 4.5mA
ILS min (IL = 6mA) = 1.3mA
♦ ILb
ILb =
1.6
+
4.2
+ 4.5 +
0.715
0.14
+
1.3 mA
ILb = 16.5mA
ILS (for IL = ILb) = 0.285 • ILb = 4.7mA
♦ at IL = 100mA:
∆(ILS) = 0.91 • ∆(IL) = 0.91 • (100 - 16.5) = 76mA
ILS = 4.7 + 76 = 80.7mA
2) R9 = 56KΩ; R6 = 18KΩ
♦ DC characteristic = 6.1V for Iint max:
♦ ∆Χ χηαραχτε = 4.8V for Iint min:
11/15
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