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TEA7089AFP Scheda tecnica(PDF) 5 Page - STMicroelectronics

Il numero della parte TEA7089AFP
Spiegazioni elettronici  LOW-RANGE PHONE DEDICATED CHIP
Download  17 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TEA7089AFP Scheda tecnica(HTML) 5 Page - STMicroelectronics

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ELECTRICAL SPECIFICATIONS (continued)
AC Characteristics (Tamb =25
°C; RL = 600Ω ; Logic in Default Mode unless otherwise noted)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
R1
Return Loss
Test 2, IL = 22mA
f = 300/3400Hz, VAC = -10dBV
17
dB
Transmit Characteristics
(Tamb =25
°C; RL = 600Ω ; f = 1kHz ; Logic in Default Mode unless otherwise noted)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Gtx
Gtxl
Gtxs
Microphone Gain
Test 3, Vm = -55dBV
R8 = 1.3k
Ω, R25 = 3.9kΩ
IL = 22mA
IL = 90mA
45
38
46
40
47
42
dB
dB
Zmic
Microphone Input Impedance
between MIC1 & MIC2
32
40
48
k
Ntx
Noise
Test 3, 2k
Ω on microphone inputs,
IL = 22mA
-76
dBmp
Mmic
Microphone Mute
Test 3, Vm = -55dBV, IL = 22mA
60
dB
Dtx
VL Max.
Soft Clipping
- Distortion
- Maximum Level on Line
Test 3, IL = 22mA, see Figure 2
Vm = -41dBV
Vm = -34dBV
1.5
2%
Vp
The maximum gain Gtl is adjustable between 44
and 56dB with R8 :
Gtxl
= 20log
820
R10 // RL
+ R11
R8 // 50k
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 > 2.6k
Ω)
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 300k
Ω 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 TEA7089A
respect to ground is 2.2V. On long line, when the
voltage over TEA7089A is low, the softclipping
function automatically limits the AC dynamic to
avoid to reach the 2.2V limit on TEA7089A respect
to ground.
0.1
1
10
100
0.1
1
10
Thre s hold
Leve l
V
microph on e peak ( m V)
-2
-5
-10
-15
Figure 2 : Softclipping
0
20
4 06 08 0
10 0
0
2
4
6
10
V
AC p eak
I
L (mA)
8
V
AC p eak
Figure 3
TEA7089A
5/17


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