參數(shù)資料
型號(hào)： 935263380518
廠(chǎng)商： NXP SEMICONDUCTORS
元件分類(lèi)： 無(wú)繩電話(huà)/電話(huà)
英文描述： TELEPHONE SPEECH CKT, PDSO16
封裝： PLASTIC, SOT-109, SO-16
文件頁(yè)數(shù)： 29/30頁(yè)
文件大小： 218K
代理商： 935263380518
2000 Mar 21
8
Philips Semiconductors
Product specication
Low voltage telephone transmission circuit with
dialler interface and regulated strong supply
TEA1114A
handbook, full pagewidth
MGK807
Iline
Rline
VCC
VEE
LN
VDD
CVCC
100
F
CVDD
220
F
TEA1114A
RCC
ICC
IDD
ILN
REXCH
VEXCH
peripherals
SENSE
SWITCH
VDD regulator
ISUP
Fig.6 VDD regulator configuration.
Set impedance
In the audio frequency range, the dynamic impedance is
mainly determined by the RCC resistor. The equivalent
impedance of the circuit is illustrated in Fig.7.
Transmit stage (pins MIC+, MIC
and DTMF)
MICROPHONE AMPLIFIER (PINS MIC+ AND MIC
)
The TEA1114A has symmetrical microphone inputs.
The input impedance between pins MIC+ and MIC
is
64 k
(2 × 32 k). The voltage gain from pins MIC+/MIC
to pin LN is set at 44.2 dB (typically).
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 RX at a low level (confidence tone).
The TEA1114A has an asymmetrical DTMF input.
The input impedance between DTMF and VEE is 20 k.
The voltage gain from pin DTMF to pin LN is set at 26 dB.
Automatic gain control has no effect on the DTMF
amplifier.
handbook, halfpage
LN
VEE
SLPE
RSLPE
CREG
REG
VCC
RCC
4.7
F
100
F
CVCC
619
20
RP
Vref
LEQ
MBE788
Fig.7 Equivalent impedance between LN and VEE.
LEQ =CREG × RSLPE × RP.
RP = internal resistance.
RP = 17.5 k.
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