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TEA7540FP Datasheet(PDF) 7 Page - STMicroelectronics

Part # TEA7540FP
Description  HANDSFREE CONTROLLER
PDF  12 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TEA7540FP Datasheet(HTML) 7 Page - STMicroelectronics

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ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Fig.
PEAK DETECTOR
Rinpd
Input impedance
PIN17
7.5
10
14.5
K
Ω
1
Icr2
Rise time current
16
20
24
µA7
NOISE MEMORIZATION
V1
Max voltage drop on PIN 19
33
36
45
mV
8
ATTENUATOR
Rina
Input impedance
PIN25
7.5
10
14.5
K
Ω
1
ATR-
Attenuation= 20lg(Voutr/Vatte)
Mode: Inactive RX, TX
Comp. Max Gain
Rpin24 = 11K
Ω
Rpin24 = 15K
Ω
46
58
dB
dB
9
ATR-active Mode: Active
Rpin24 = 11K
Ω
0
1.5
3
dB
10
ATR-IDLE Mode: Noise RX, TX Comp.
Max Gain
Rpin24 = 11K
Ω
23
dB
11
ATTENUATION CONTROL SECTION
VTIME
Tx Mode Att.Voltage
190
250
325
mV
12
ITIME
TX Mode Att.Current
40
50
70
µA12
VTIMR
RX Mode Att.Voltage
-325
-250
-190
mV
13
ITIMR
RX Mode Att.Current
40
50
70
µA13
ATRVOL
Volume Control
29
32
35
dB
14
MICROPHONE PREAMPLIFIER
Ramp
Imput impedance
PIN21
35
50
70
K
Ω
Gmic
Vmic = Voute-Vamp in
Vcs open
19
20
21
dB
G2off
Compressor Gain
Monitoring Mode
G2 = Vrecout/Vinr
Rext between PINs 2 - 28
Rext = open
Rext = 40K
Ω
36.5
16
dB
dB
Figure 1: Basic Configuration
Figure 2: Test Configuration
V
+ =3V
pin 7 is forced to transmit mode
pin 11 is forced to max gain
Input signal on pin 13 VINE = 1.5mVpp
output voltage VMICOUT measured on pin 12
G1max = 20log (VMICOUT / VINE)
TEA7540
7/12



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