TEA7063 查看數據表（PDF） - STMicroelectronics

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TEA7063

SPEECH CIRCUIT WITH POWER MANAGEMENT

STMicroelectronics 

In this condition an internal connection is acti-

vated from line DTMF output (pin 16) to Receive

Output (pin 20) with an attenuation GRS = 38.5dB

to provide acoustic feedback of the DTMF emis-

sion.

4. A.G.C AND SIDETONE PROGRAMMING

4.1 Programmable Controls

AGC and sidetone attack and disonnect points (or

currents) are programmable externally through

two independents pins, I-start (pin 9) and I-slope

(pin 15).

4.2 I-Start (pin 9)

An external resistor RLL connected between I-

start (pin 9) and Microprocessor Supply (pin 19)

controls the attack point of AGC and ZAL (an-

tisidetone Z).

ILL is the line current at which the control starts.

Formulas for ILL and RLL with R9 = 100K are:

ILL

=

2880

RLL

+

11mA

RLL =

2880

( ILL − 11mA )

4.3 I-Slope (pin 15)

An external resistor RLS connected between

I-slope (pin 15) and Microprocessor Supply (pin

19) controls the disconnected point of AGC and

Figure 7

TEA7063

ZAS (antisidetone Z). ILS is the line current at

which the control stops. Formulas for ILS and

RLS with R9 = 100K are:

ILS

=

4680

RLS

+

ILL;

RLS =

4680

( ILS − ILL )

4.4 A.G.C. OFF (pin 9 and 15)

Programming ILL and ILS respectively higher

than 70mA and 450mA is forcing the IC in AGC

OFF Condition.

Suggested external components are:

RLL = 51KΩ and RLS = 10KΩ

In this case sending, receiving gain and sidetone

compensation are independent of the line lenght.

Pins 1 and 2 can be connected to each other sav-

ing 5 passive external components at pin 2.

4.5 Secret Function for Private (pin 14)

The two separate thresholds for sending and Re-

ceiving Mute (pin 14) allow ”Secret Function”

(only microphone muted).

Pin 14 can be set:

a) between 0.25V and 0.8V for speech mode,

b) between 1.6V and 2.1V for ”secret” mode (mi-

crophone muted),

c) between 2.7V and 3.3V for ”all muted” mode

9/15

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