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參數(shù)資料
| 型號(hào)： | 935264403005 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | TELEPHONE SPEECH CKT, UUC17 |
| 封裝： | DIE-17 |
| 文件頁數(shù)： | 30/30頁 |
| 文件大?。?/td> | 178K |
| 代理商： | 935264403005 |
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2000 Feb 18
9
Philips Semiconductors
Product specication
Speech circuit with dialler interface, regulated
supply and earpiece volume control
TEA1111A
handbook, halfpage
0
20
40
100
500
0
400
FCA057
60
80
300
200
100
ILEDC
(
A)
Iline (mA)
Fig.8 LEDC current versus line current.
handbook, halfpage
LN
VEE
SLPE
RSLPE
CREG
REG
VCC
RCC
4.7
F
100
F
CVCC
619
20
RP
Vref
LEQ
MBE788
Fig.9 Equivalent impedance between LN and VEE.
LEQ =CREG × RSLPE × RP.
RP = internal resistance.
RP = 17.5 k.
Transmit stage (pins MIC+, MIC
and DTMF)
MICROPHONE AMPLIFIER (PINS MIC+ AND MIC
)
The TEA1111A has symmetrical microphone inputs.
The input impedance between pins MIC+ and MIC
is
68 k
(2 × 34 k). The voltage gain from pins MIC+/MIC
to pin LN is set at 44.2 dB (typical) at 600
line load.
Automatic gain control is provided on this amplifier for line
loss compensation.
DTMF AMPLIFIER (PIN DTMF)
When the DTMF amplifier is enabled, dialling tones may
be sent on line. These tones are also sent to the receive
output QR at a low level (confidence tone), the level is
controlled by pin VCI.
The TEA1111A has an asymmetrical DTMF input. The
input impedance between DTMF and VEE is 20 k and it
is biased at VEE. The voltage gain from pin DTMF to pin LN
is set at 25.9 dB.
Automatic gain control has no effect on the DTMF
amplifier.
Receiving stage (pins IR, GAR, QR and VCI)
The receive part consists of an earpiece amplifier and a
volume control block.
EARPIECE AMPLIFIER
The earpiece amplifier has one input (IR) and one output
(QR). The input impedance between pin IR and pin VEE is
22 k
. When pin VCI is tied to VEE, the voltage gain from
pin IR to pin QR is set at 27.4 dB (typical) which reduces
the attenuation of the receive signal by the anti-sidetone
network from 32 dB to 4.6 dB. The gain can be decreased
by connecting an external resistor RGARext between pins
GAR and QR; the adjustment range is 6 dB. Two external
capacitors CGAR (connected between pins GAR and QR)
and CGARS (connected between pins GAR and VEE)
ensure stability. Capacitor CGAR provides a first-order
low-pass filter. The cut-off frequency corresponds to the
time constant CGAR × RGARint. Where RGARint is the internal
resistor (123 k
typical) which sets the gain. The
relationship CGARS =10 × CGAR must be complied with to
ensure stability.
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