TEA7092 ST Microelectronics, Inc., TEA7092 Datasheet - Page 8

• Manufacturer Part Number: TEA7092
• Description: Telephone Analog Front End
• Manufacturer: ST Microelectronics, Inc.

TEA7092
RECEIVE CHARACTERISTICS (T
The sidetone of the TEA7092 uses two networks, these two networks are internally mixed between long line
length and short line length.
The following equation gives the sidetone impedance versus line current : ZAL = K x ZALL + (1 - K) x ZASL
K = 1 for I
It is possible to use only the standard one sidetone concept by short-circuited Pins SNSL ans SNLL.
Gain Control Inhibition Facility For PABX Application
(T
LOUDSPEAKER AMPLIFIER PART
Loudspeaker Amplifier Channel (T
The Loudspeaker amplifier channel has a maximum gain of 35dB between Pin LSIN and Pin LSOUT. This
gain is programmable through the serial bus interface, 7 steps of 4dB each.
To avoid distortion, the output level on the loudspeaker is controlled by a softclipping function, the time
constant of this feature is connected to LSSOF pin.
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Symbol
Symbol
Symbol
amb
Grs+6
GLS0
GLS1
GLS2
GLS3
GLS4
GLS5
GLS6
GLS7
PLS1
PLS2
Drx1
Drx2
Z
Gtp
Grp
Grs
Mrx
Nrx
Mls
lsin
Grl
Z
Eff
OUT
IN
= 25°C, I
L
= ILL ; K = 0 for I
Sidetone Efficiency
Gain
+6dB Code [0010110]
Distortion
Noise
Mute
Input Impedance
Output Impedance
Transmit Gain
Receive Gain
GAIN VHP/Vac
Mute Loudspeaker
Input Impedance
Output Power
GMAX
GMAX-4dB
GMAX-8dB
GMAX-12dB
GMAX-16dB
GMAX-20db
GMAX-24dB
GMAX-28dB
L
= 20mA, f = 1kHz / No AGC mode selected 0010100)
Parameter
Parameter
Parameter
L
= ISL, and K varies linearly between 1 and 0 when I
amb
Test 3, V
Test 2
Test 2, I
Test 2, I
Test 2, I
Test 4 IL = 20mA
Code: (0 1 0 0 1 1 1)
Code: (0 1 0 0 1 1 0)
Code: (0 1 0 0 1 0 1)
Test 4, Gain = GLS0, V
Between Pins SNSL & SNLL
Test 2
Test 3
Code: (0 1 0 0 1 0 0)
Code: (0 1 0 0 0 1 1)
Code: (0 1 0 0 0 1 0)
Code: (0 1 0 0 0 0 1)
Code: (0 1 0 0 0 0 0)
Test 4
amb
= 25°C, f = 1kHz)
I
I
I
V
V
I
I
L
L
L
L
L
= 25°C, f = 1kHz, R
ear
ear
= 20mA
= 90mA
= 90mA
= 20mA, D
= 90mA, D
L
= -3dBV
= 0dBV
L
L
em
= 20mA
= 20mA
= 20mA, V
Test Conditions
Test Conditions
Test Conditions
= -48dBV, I
2%
2%
L
= -9dBV
IN
L
= 20mA
= 0.15V
LS
= 50
RMS
V
em
Gtl - 3
Grl - 3
Min.
Min.
Min.
33.5
29.5
25.5
21.5
17.5
13.5
-1.2
9.5
5.5
60
30
13
40
5
5
= 0)
L
varies between ILL and ISL.
Grl - 1.4 Grl - 0.5
Gtl - 2
Typ.
Typ.
Typ.
120
0.8
-76
18
55
35
31
27
23
19
15
11
40
6
6
5
7
Gtl -1
Max.
Max.
Max.
36.5
32.5
28.5
24.5
20.5
16.5
12.5
150
2.8
8.5
-30
26
50
7
7
3
5
dBmp
Unit
Unit
Unit
mW
mW
dB
dB
dB
dB
dB
k
dB
dB
dB
dB
dB
dB
dB
dB
dB
k
dB
dB
%
%