tea1083at NXP Semiconductors, tea1083at Datasheet - Page 5

• Manufacturer Part Number: tea1083at
• Description: Call Progress Monitor For Line Powered Telephone Sets
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 1 Comparison of the TEA108X family.
Notes
1. A call progress monitor is recommended by the
2. The MUTE function of the TEA1085A has a logic input;
3. SEL: loudspeaker connected in a single-ended-load
4. Consult the product specification for the package
March 1994
Application area
PD facility
MUTE or LSE facility
Dynamic limiter
Howling limiter
V
SEL
BTL
Number of pins
BB
Call progress monitor for line powered
telephone sets
European Telecommunications Standards Institute
(ETSI) for telephone sets with automatic on-hook
dialling facilities so that audible, or visual, progress of
a call attempt can be monitored. In accordance with
the ETSI (at a frequency of 440 Hz and a line level of
20 dBm (600 )), a minimum level of 50 dBA shall be
guaranteed at a distance of 50 cm from the set. This
corresponds to a minimum level of approximately
100 mV (RMS) (P
Philips type AD2071/Z50.
A listening-in set has to offer the user more facilities
e.g. howling limiting to reduce annoying loudspeaker
and line signals. Dynamic limiting of the loudspeaker
signal, with respect to supply conditions, can also be
required. Acoustic output levels for listening-in sets are
approximately 70 to 75 dBA. This corresponds to a
loudspeaker level of approximately 1 mV (RMS)
(P
the MUTE function of the TEA1085 has a toggle input.
configuration
BTL: loudspeaker connected in a bridge-tied-load
configuration
outline/s.
setting
O
20 mW).
PRODUCT
O
0.2 mW) across a loudspeaker;
note 1
note 2
note 3
note 3
note 4
CONDITIONS
5
FUNCTIONAL DESCRIPTION
The TEA1083/83A is normally used in conjunction with a
transmission circuit of the TEA1060 family. The circuit
must be connected between the positive line terminal
(pin 2) and pin SLPE of the transmission IC. The
transmission characteristics (impedance, gain settings,
etc.) are not affected.
An interconnection between the TEA1083/83A and a
member of the TEA1060 family is illustrated in Fig.5.
Supplies SUP, SREF, V
In Fig.6 the line current is divided into I
transmission IC and I
TEA1083/83A.
I
I
I
Where:
A practical value for resistor R20 is 150 ; this produces a
current of approximately 3.3 mA (typ) for I
approximately equal to I
TR
TR
SUP
TEA1083
V
voltage of 500 mV (typ) between pins SUP and SREF
R20 is a resistor connected between SUP and SREF
I
(approximately 1 mA).
CC
call progress monitoring
is constant:
int
= V
X
X
8
= I
is the internal current consumption of the TEA106X
is an internal temperature compensated reference
int
line
/ R20
I
CC
TEA1083A
I
SUP
TR
TEA1083; TEA1083A
16
X
X
X
line
BB
for the monitoring circuit
and V
4.3 mA.
SS
Product specification
TEA1085/85A
TR
listening-in
for the
TR
24
X
X
X
X
X
X
X
and I
SUP
is