TEA1065 데이터 시트보기 (PDF) - Philips Electronics

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TEA1065

Versatile telephone transmission circuit with dialler interface

Philips Electronics 

Philips Semiconductors

Versatile telephone transmission circuit with

dialler interface

Product specification

TEA1065

Microphone inputs MIC+ and MIC− and gain

adjustment connections GAS1 and GAS2

The TEA1065 has symmetrical microphone inputs, its

input impedance is 40.8 kΩ (2 × 20.4 kΩ) and its voltage

gain is typ. 38 dB with R7 = 68 kΩ. Either dynamic,

magnetic or piezoelectric microphones can be used, or an

electret microphone with a built-in FET buffer.

Arrangements for the microphones types are illustrated in

Fig.9.

The gain of the microphone amplifier is proportional to

external resistor R7, connected between GAS1 and

GAS2, which can be adjusted between 30 dB and 46 dB to

suit the sensitivity of the transducer.

An external 100 pF capacitor (C6) is required between

GAS1 and SLPE to ensure stability. A larger value of C6

may be chosen to obtain a first-order low-pass filter. The

“cut-off” frequency corresponds with the time constant

R7 × C6.

handbook, full pagewidth

MIC+

8

(1)

MIC−

7

VCC

MIC−

21

7

MIC+

8

16

VEE

(a)

(a) magnetic or dynamic microphone,

the resistor (1) may be connected to

reduce the terminating impedance, or

for sensitive types a resistive

attenuator can be used to prevent

overloading the microphone inputs;

(b)

(b) electret microphone;

Fig.9 Microphone arrangements.

MIC+

8

MIC−

7

MBA553

(c)

(c) piezoelectric microphone.

March 1994

9

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