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TEA1065 View Datasheet(PDF) - Philips Electronics

Part NameDescriptionManufacturer
TEA1065 Versatile telephone transmission circuit with dialler interface Philips
Philips Electronics Philips
TEA1065 Datasheet PDF : 28 Pages
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Philips Semiconductors
Versatile telephone transmission circuit with
dialler interface
Product specification
TEA1065
Microphone inputs MIC+ and MICand gain
adjustment connections GAS1 and GAS2
The TEA1065 has symmetrical microphone inputs, its
input impedance is 40.8 k(2 × 20.4 k) and its voltage
gain is typ. 38 dB with R7 = 68 k. 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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