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TEA1065T データシート(PDF) 9 Page - NXP Semiconductors

部品番号 TEA1065T
部品情報  Versatile telephone transmission circuit with dialler interface
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メーカー  PHILIPS [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1065T データシート(HTML) 9 Page - NXP Semiconductors

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March 1994
9
Philips Semiconductors
Product specification
Versatile telephone transmission circuit with
dialler interface
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 k
Ω (2 × 20.4 kΩ) and its voltage
gain is typ. 38 dB with R7 = 68 k
Ω. 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.
Fig.9 Microphone arrangements.
(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) electret microphone;
(c) piezoelectric microphone.
handbook, full pagewidth
MBA553
VEE
VCC
21
7
8
16
8
7
(1)
(a)
(b)
(c)
MIC
+
MIC
MIC
MIC
+
8
7
MIC
MIC
+


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