TEA7540FP 查看數據表（PDF） - STMicroelectronics

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TEA7540FP

MONITOR AMPLIFIER

STMicroelectronics 

ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Condition

PEAK DETECTOR

Rinpd Input impedance

Icr 2

Rise time current

NOISE MEMORIZATION

PIN17

V1 Max voltage drop on PIN 19

ATTENUATOR

Rina Input impedance

PIN25

ATR-

Attenuation= 20lg(Voutr/Vatte) Rpin24 = 11KΩ

Mode: Inactive RX, TX

Rpin24 = 15KΩ

Comp. Max Gain

ATR-active Mode: Active

ATR-IDLE Mode: Noise RX, TX Comp.

Max Gain

Rpin24 = 11KΩ

Rpin24 = 11KΩ

ATTENUATION CONTROL SECTION

VT IME

ITIME

VTIMR

ITIMR

ATRVOL

Tx Mode Att.Voltage

TX Mode Att.Current

RX Mode Att.Voltage

RX Mode Att.Current

Volume Control

MICROPHONE PREAMPLIFIER

Ramp

Gmic

G2off

Imput impedance

Vmic = Voute-Vamp in

Compressor Gain

Monitoring Mode

G2 = Vrecout/Vinr

PIN21

Vcs open

Rext between PINs 2 - 28

Rext = open

Rext = 40KΩ

TEA7540

Min. Typ. Max. Unit Fig.

7.5

10

14.5

KΩ

1

16

20

24

µA

7

33

36

45

mV

8

7.5

10

14.5

KΩ

1

46

dB

9

58

dB

0

1.5

3

dB

10

23

dB

11

190 250 325 mV

12

40

50

70

µA

12

-325 -250 -190 mV

13

40

50

70

µA

13

29

32

35

dB

14

35

50

70

KΩ

19

20

21

dB

36.5

dB

16

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)

7/12

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