TEA7092TQ 데이터 시트보기 (PDF) - STMicroelectronics

부품명

상세내역

일치하는 목록

TEA7092TQ

TELEPHONE ANALOG FRONT END

STMicroelectronics 

TEA7092

TRANSMIT CHARACTERISTICS (continued)

Maximum Level on Line in Tx (see Figure 3)

The minimum operating voltage of the TEA7092 is 2.5V. At low line current value, when the voltage over

the TEA7092 is low, the softclipping function automatically limits the AC dynamic to avoid to reach the 2.5V

limit on the TEA7092.

When the DC voltage over the TEA7092 is high enough, the AC dynamic is limited at a value fixed by the

external resistor RSOFT connected on Pin SOFTL.

The Value of RSOFT is performed by : RSOFT = (RS x 50E-6 - 0.8 - VacPeak) / 40E-6

Tx Characteristics (Tamb = 25°C, f = 1kHz, see Test 3)

Symbol

Parameter

Test Conditions

Min.

Transmit gain in Handset Mode

Vem = -48dBV

Gtl

IL = 20mA

44

Gtsm

IL = 90mA

37

Transmit gain in Handsfree Mode Vhfin = -28dBV, Code 0110010

Ghl

IL = 20mA

24

Ghfm

IL = 90mA

17

Gt-6dB Transmit Gain

Vem = -48dBV, IL = 20mA

5

(-6dB in transmit path)

Code 0110110

Zmic

Zhf

Ntx

Nhf

Mmic

VLpeak

Dtx1

Dtx2

Handset Mic Input Impedance

Between Pins MIC1, MIC2

30

Handsfree Mic Input Impedance Between HFIN and VREF

15

IL = 20mA, Code 0110010

Transmit Noise in Handset Mode

2kΩ between MIC1 & MIC2

Transmit Noise in Handsfree Mode

2kΩ between HFIN & VREF

Microphone Mute

Vem = -48dBV, IL = 20mA

60

Transmit Softclipping Level

See Figure 2, Vem = -42dBV, IL = 20mA 1.0

Transmit Distortion

IL = 20mA, see Figure 2

Vem = -48dBV

Vem = -36dBV

Typ.

45

39

25

19

6

40

20

-75

-75

1.4

Max. Unit

46 dB

41 dB

26 dB

21 dB

7

dB

50 kΩ

25 kΩ

dBmp

dBmp

dB

1.8 Vpeak

1

%

5

%

Squelch on Transmit Channel (Tamb = 25°C, f = 1kHz, IL = 20mA, see Test3)

The principle of the squelch is to reduce the transmit gain as soon as the amplitude of the signal on the

microphone is lower than a fixed threshold voltage, VT2.

Symbol

Gtlmax

Gtlmax-Gsq

Gsq

Parameter

Transmit Gain

Gain Variation

Test Conditions

Vem1 = -75dBV

Vem2 = -65dBV

See Figure 4 /

Min. Typ. Max. Unit

36

dB

45

dB

9

dB

Figure 3 : Line Peak Voltage versus DC Line

Current

10

8

VAC Pe ak

6

DC Mas k

4

VAC Peak

2

2.5V Min. Line Pe a k Voltag e

0

20

40

60

80

100

IL (mA)

Figure 4 : Transmit Gain versus Microphone

AC Input Signal

Tra ns mit

Gain (dB)

Gtlmax

Gtlmax - Gs q

Dgt

Ve m1 VT1

VT2

Vem2

Microphone AC Voltage

Gst

Ve m

(dBV)

7/24

Share Link: