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TEA1114AUH View Datasheet(PDF) - Philips Electronics

Part NameDescriptionManufacturer
TEA1114AUH Low voltage telephone transmission circuit with dialler interface and regulated strong supply Philips
Philips Electronics Philips
TEA1114AUH Datasheet PDF : 28 Pages
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Philips Semiconductors
Low voltage telephone transmission circuit with
dialler interface and regulated strong supply
Product specification
TEA1114A
handbook, full pagewidth Rline
Iline
ILN
LN
REXCH
ISUP
VEXCH
TEA1114A
RCC
ICC
VCC
SENSE
SWITCH
VDD regulator
VEE
VDD
IDD
CVCC
100 µF
peripherals
CVDD
220 µF
MGK807
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.
LN
handbook, halfpage
LEQ
RP
RCC
619
Vref
SLPE
VEE
RSLPE
20
REG
CREG
4.7 µF
VCC
CVCC
100 µF
MBE788
LEQ = CREG × RSLPE × RP.
RP = internal resistance.
RP = 17.5 k.
Fig.7 Equivalent impedance between LN and VEE.
Transmit stage (pins MIC+, MICand DTMF)
MICROPHONE AMPLIFIER (PINS MIC+ AND MIC)
The TEA1114A has symmetrical microphone inputs.
The input impedance between pins MIC+ and MICis
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.
2000 Mar 21
8
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