TEA7092 ST Microelectronics, Inc., TEA7092 Datasheet - Page 10

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

TEA7092
DTMF GENERATOR (T
Unwanted frequencies comply with CEPT 46-03.
SINE WAVE GENERATOR ( T
The sine wave generator uses the same path than the DTMF generator. Sinus wave frequencies are the
half of the DTMF frequencies.
ERROR BEEP GENERATOR
The frequencies of the error beep generator are given by : F
Fi can take one the following values : 19455Hz, 21308Hz, 23551Hz or 26321Hz, and n varies between 1
and 63.
Error beep generator code generates square wave signal in the earphone.
Error beep generator code following by group listening code generate square wave signal in the earphone
and in the loudspeaker.
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Symbol
Symbol
Vehf
Amf
LhF
Pmf
Velf
Vlhf
Sfh
Vllf
t
Sfl
Llf
t
diff
R
Low Frequency Group Line Level
Hifh Frequency Group Line Level
Rise Time
Decay Time
Confidence Tone Level :
- Earphone Level (Low Frequency)
- Earphone Level (High Frequency)
- Loudspeaker Level (Low Frequency)
- Loudspeaker Level (High Frequency)
Line Level
Line Level
Tone Frequency Accuracy
Preemphasis HF/LF
Parameter
amb
Parameter
= 25°C, see Test 3)
Low Frequency Group 348 / 385 / 426 / 470Hz
High Frequency Group 604 / 668 / 738 / 816 Hz
amb
= 25°C, I
Test Conditions
L
= 20 & 90mA, see Test 3)
f = 3.58MHz, I
I
I
I
I
I
I
Code Level (0100111)
L
L
L
L
L
L
= 20mA & 90mA
= 20mA & 90mA
= 20mA & 90mA
= 20mA & 90mA
= 20mA & 90mA
= 20mA & 90mA
Test Conditions
EB
L
= 90mA
Fi
n
.
Min.
Min.
-0.4
-9.5
-7.5
-35
-33
-10
-18
-16
-8
1
Typ.
Typ.
-32
-30
-14
-12
-8
-6
-7
-5
2
Max.
Max.
-6.5
-4.5
-29
-27
-10
0.4
-4
-2
-8
3
5
5
dBm
dBm
dBm
dBm
dBm
dBm
Unit
Unit
dBm
dBm
ms
ms
dB
%