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參數(shù)資料
| 型號： | TEA1096AT |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Speech and listening-in IC |
| 中文描述： | TELEPHONE SPEECH CKT, PDSO28 |
| 封裝： | PLASTIC, SO-28 |
| 文件頁數(shù)： | 12/32頁 |
| 文件大?。?/td> | 390K |
| 代理商： | TEA1096AT |
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November 1994
12
Philips Semiconductors
Product Specification
Speech and listening-in IC
TEA1096; TEA1096A
Fig.10 Dynamic limiter of the microphone channel.
Receiving amplifier: pins LN, GAR, QRP and QRM
The receiver gain is defined between the line connection
LN and the earpiece complementary outputs QRP
(non-inverting) and QRM (inverting). With R
GAR
equal to
90.9 k
the gain from LN to QRP is
2.5 dB. The outputs
may be used to connect a dynamic, magnetic or
piezoelectric earpiece. When the earpiece impedance
exceeds 450
, differential drive (BTL connection) can be
used. As both outputs are in opposite phase, the gain from
LN to QRP or QRM is 3.5 dB.
By means of the R
GAR
resistor, the gain of the receiving
amplifier can be adjusted to suit the sensitivity of the
transducer which is used. The permitted range is between
14 dB and +6 dB for single-ended drive (SE), and
between
8 dB and +12 dB for bridge-tied load (BTL)
drive.
Two external capacitors, C
GAR
(100 pF) and C
GARS
(1 nF),
ensure stability. The C
GAR
capacitor is also used to obtain
a first-order low-pass filter. The cut-off frequency
(corresponding to the time constant R
GAR
×
C
GAR
) can be
adjusted by the C
GAR
capacitor, but the relationship
C
GARS
= C
GAR
×
10 must be maintained.
During DTMF dialling, the dialling tones can be heard in
the earpiece at a very low level. This is called confidence
tone.
Automatic gain control: pin AGC
Automatic compensation of line-loss is obtained by
connecting a resistor R
AGC
between pin LN and pin AGC.
This automatic gain control changes the gain of the
microphone and receiving amplifiers in accordance with
the DC line current.
The control range is 6 dB; This corresponds to a 5 km line
of 0.5 mm diameter copper twisted-pair cable:
DC resistance = 176
/km
average attenuation = 1.2 dB/km.
The value of R
AGC
must be chosen with reference to the
exchange supply voltage and its feeding bridge resistance
and has no influence on the ratio (I
start
/I
stop
) which remains
constant. Figure11 illustrates the gain attenuation when
R
AGC
= 100 k
. If automatic line-loss compensation is not
required, the AGC pin can be left open circuit, the
amplifiers then give their maximum gain and the double
sidetone principle is no longer active. Only one network is
used. Pins BAL1 and BAL2 must then be short-circuited
together.
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| TEA1096ATD-T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telephone Speech Circuit |
| TEA1096T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Speech and listening-in IC |
| TEA1096TD-T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telephone Speech Circuit |
| TEA1097 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Speech and loudspeaker amplifier IC with auxiliary inputs/outputs and analog multiplexer |
| TEA1097H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Speech and loudspeaker amplifier IC with auxiliary inputs/outputs and analog multiplexer |
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