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PDF TEA7088A Data sheet ( Hoja de datos )
| Número de pieza | TEA7088A | |
| Descripción | LOW-RANGE PHONE DEDICATED CHIP | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TEA7088A (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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TEA7088A
LOW-RANGE PHONE DEDICATED CHIP
. RING
- GENERATION OF 8 MELODY TONES
(Including the 3 German Melody Tones)
. - 4 STEPS DIGITAL CONTROL ON THE AM-
PLIFIER OUTPUT LEVEL
SPEECH
- TRANSMIT GAINEXTERNALLY ADJUSTABLE
- RECEIVINGGAINEXTERNALLYADJUSTABLE
- AGCSLOPEEXTERNALLYPROGRAMMABLE
- SOFTCLIPPING ON SENDING CHANNEL
- RECEIVE AMPLIFIER FOR PIEZO OR
ELECTRODYNAMIC TRANSDUCER
. - +6dB MODE ON RECEIVE CHANNEL
- LINE POWER MANAGEMENT
DIALING
- DTMF GENERATOR
- LOW DC MASK DURING MAKE PERIOD
. THROUGH MICROCONTROLLER SERIAL
BUS INTERFACE
MICROCONTROLLER INTERFACE
- 1.79MHz CLOCK OR 3.58MHz OSCILLATOR
INPUT
. MICROCONTROLLER POWER SUPPLY
. MICROCONTROLLER CONTROL INTER-
FACE INCLUDING SERIAL BUS
. LINE CURRENT EXTRACTOR FOR SUPPLY
OF EXTERNAL PERIPHERALS
SO28
(Plastic Package)
ORDER CODE : TEA7088AFP
PIN CONNECTIONS
S OFT
RECIN
SN
AGC
1
2
3
4
28 DTMF
27 VREF
26 VRMC
25 DCL
MIC1
5
24 DATA
MIC2
6
23 MSK
GTR
7
22 OSC
DESCRIPTION
The TEA7088A is a Telephone Analog Front End
device, TAFE, which integrates the three basic
functions of a standard telephone set :
- Speech network,
- DTMF generator,
- Ringer generator on buzzer.
A complete telephone set can be designed using
TEA7088A associated with a low cost microcon-
troller.
VCC
GND
IVLS
VS
VL
VMC
GREC
8
9
10
11
12
13
14
21 RI
20 PON
19 RES
18 VRING
17 BUZ
16 EAR+
15 EAR-
January 1998
1/17
1 page  
TEA7088A
ELECTRICAL SPECIFICATIONS (continued)
AC Characteristics (Tamb = 25°C ; RL = 600Ω ; Logic in Default Mode unless otherwise noted)
Symbol
Parameter
Test Conditions
Min. Typ. Max.
R1 Return Loss
Test 2, IL = 22mA
f = 300/3400Hz, VAC = -10dBV
17
Unit
dB
Transmit Characteristics
(Tamb = 25°C ; RL = 600Ω ; f = 1kHz ; Logic in Default Mode unless otherwise noted)
Symbol
Gtx
Gtxl
Gtxs
Zmic
Ntx
Parameter
Microphone Gain
Microphone Input Impedance
Noise
Mmic
Dtx
VL Max.
Microphone Mute
Soft Clipping
- Distortion
- Maximum Level on Line
Test Conditions
Test 3, Vm = -55dBV
R8 = 1.3kΩ, R25 = 3.9kΩ
IL = 22mA
IL = 90mA
between MIC1 & MIC2
Test 3, 2kΩ on microphone inputs,
IL = 22mA
Test 3, Vm = -55dBV, IL = 22mA
Test 3, IL = 22mA, see Figure 2
Vm = -41dBV
Vm = -34dBV
Min. Typ.
45 46
38 40
32 40
-76
60
1.5
Max.
47
42
48
2
Unit
dB
dB
kΩ
dBmp
dB
%
Vp
Figure 2 : Softclipping
10
Thres hold
Le ve l
1
0.1
0.1
Figure 3
10
8
1 10
Vmicrophone pe a k (mV)
6
4
2 VAC pe a k
0
0 20
40 60
IL (mA)
-15
-10
-5
-2
100
VAC pe a k
80 100
The maximum gain Gtl is adjustable between 44
and 56dB with R8 :
Gtxl
=
20log 820
⋅
R1R08///R/ 5L0+kΩR11
The AGC variation is programmed with one resistor
connected on Pin AGC. ISL is the line current at
which the gain must be decreased by 6dB.
R25
(Ω)
=
300
ISL − 5mA
(R25
>
2.6kΩ)
For line current lower than ILL or higher than ISL,
The transmit and receive gains have a constant
value.
If no resistor or a resistor higher than 300kΩ is
connected on Pin AGC, the gain is constant and
equal to Gtxl and Grxl. ±0.5dB.
AGC can be inhibited also through MCU code
”010100”. In this case Tx and Rx gains are fixed
2dB lower than the maximum gain.
The minimum saturation voltage of the TEA7088A
respect to ground is 2.2V. On long line, when the
voltage over TEA7088A is low, the softclipping
function automatically limits the AC dynamic to
avoid to reach the 2.2V limit on TEA7088A respect
to ground.
5/17
5 Page 
TEA7088A
MICROCONTROLLER INTERFACE WITH TEA7088A (continued)
Codes
Keyboard
a5 a4 a3 a2 a1 a0
Remarks
000000
000001
000010
000011
000100
000101
000110
000111
001000
001001
001010
001011
001100
001101
001110
001111
”2” 1336Hz + 697Hz
”1” 1209Hz + 697Hz
”A” 1633Hz + 697Hz
”3” 1477Hz + 697Hz
”8” 1336Hz + 852Hz
”7” 1209Hz + 852Hz
”C” 1633Hz + 852Hz
”9” 1477Hz + 852Hz
”5” 1336Hz + 770Hz
”4” 1209Hz + 770Hz
”B” 1633Hz + 770Hz
”6” 1477Hz + 770Hz
”0” 1336Hz + 941Hz
”*” 1209Hz + 941Hz
”D” 1633Hz + 941Hz
”#” 1477Hz + 941Hz
In DTMF
Dialing
000000
000001
000010
000011
001100
001101
001110
001111
822Hz Ring Signal
744Hz Ring Signal
1005Hz Ring Signal
909Hz Ring Signal
1187Hz Ring Signal
1074Hz Ring Signal
1451Hz Ring Signal
1312Hz Ring Signal
In Ring
Mode
010000
010001
010010
010011
Speech Mode
Dialing Mode or Ring Start
Earphone & Microphone Mute
Microphone Mute
010101
Mask/No Mask
0 1 0 1 1 0 ”+6dB” Normal/+6dB on Receive Channel
010111
Reset Pin Control
111010
Initialization Code
010100
AGC / No AGC
101000
1.79MHz Ext Clock & Oscillator Stand by /
3.58MHz Ceramic (toggle)
011100
Minimum Ring Level (level 1)
011101
Intermediate Low Ring Level (level 2)
011110
Intermediate High Ring Level (level 3)
011111
Maximum Ring Level (level 4)
11/17
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet TEA7088A.PDF ] | |
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