TEA7089A View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TEA7089A

LOW-RANGE PHONE DEDICATED CHIP

STMicroelectronics 

TEA7089A

ELECTRICAL SPECIFICATIONS (continued)

DTMF Generator (Tamb = 25°C ; RL = 660Ω)

Symbol

Parameter

Test Conditions

Amf

Tone Frequency Accuracy

Test 6 Pin Osc

fclock = 1.79MHz oscillator off

or

Resonator : 3.58MHz oscillator on

C13 =100nF, IL = 22mA

Llf

Low Freq. Group Line Level

Lhf

High Freq. Group Line Level

Pmf

Preemphasis HF/LF

tDON

tDOFF

Cmf

Rise Time

Decay Time

DTMF Confidence Tone :

Earphone level (low freq.)

Earphone level (high freq.)

–

- Unwanted Harmonics Level (see Figure 6)

Min.

- 0.4

-10

-8

+1

13

17

–

Figure 6 : Unwanted Harmonics Level in DTMF

-30

Typ.

-8.5

-6.5

+2

17

22

–

Max.

0.4

-7

-5

+3

5

5

21

27

–

Unit

%

dBm

dBm

dB

ms

ms

mV

mV

–

-50

-70

-90

100

1k

10k

100k

1M

(Hz)

Figure 7 : Microcontroller Interface

VL

IS pe ech

VMC

13

Ba tte ry

C10

47 F

VREF I

5 .6 V

IS tart-u p

VRING

18

I (In Ring)

kIL

VRMC (3 .4V)

26

C15

P

10 F + LCD

7/17

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