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TEA1112 데이터시트 PDF




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부품번호 TEA1112 기능
기능 Low voltage versatile telephone transmission circuits with dialler interface
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TEA1112 데이터시트, 핀배열, 회로
INTEGRATED CIRCUITS
DATA SHEET
TEA1112; TEA1112A
Low voltage versatile telephone
transmission circuits with dialler
interface
Product specification
Supersedes data of 1996 Feb 16
File under Integrated Circuits, IC03
1997 Mar 26




TEA1112 pdf, 반도체, 판매, 대치품
Philips Semiconductors
Low voltage versatile telephone
transmission circuits with dialler interface
Product specification
TEA1112; TEA1112A
PINNING
SYMBOL
LN
SLPE
ILED
REG
GAS
MMUTE
MMUTE
DTMF
MUTE
MUTE
IR
AGC
MIC
MIC+
VEE
QR
GAR
VCC
PIN
TEA1112
TEA1112A
11
22
33
44
55
6
6
77
8
8
99
10 10
11 11
12 12
13 13
14 14
15 15
16 16
DESCRIPTION
positive line terminal
slope (DC resistance) adjustment
available output current to drive a LED
line voltage regulator decoupling
sending gain adjustment
microphone mute input
microphone mute input (active LOW)
dual-tone multi-frequency input
mute input to select speech or dialling mode
mute input to select speech or dialling mode (active LOW)
receiving amplifier input
automatic gain control/line loss compensation
inverting microphone amplifier input
non-inverting microphone amplifier input
negative line terminal
receiving amplifier output
receive gain adjustment
supply voltage for speech circuit and peripherals
handbook, halfpage
LN 1
SLPE 2
16 VCC
15 GAR
ILED 3
REG 4
GAS 5
14 QR
13 VEE
TEA1112
12 MIC+
MMUTE 6
11 MIC
DTMF 7
10 AGC
MUTE 8
9 IR
MBE791
handbook, halfpage
LN 1
SLPE 2
16 VCC
15 GAR
ILED 3
14 QR
REG 4
13 VEE
TEA1112A
GAS 5
12 MIC+
MMUTE 6
11 MIC
DTMF 7
10 AGC
MUTE 8
9 IR
MBE790
Fig.2 Pin configuration (TEA1112).
1997 Mar 26
Fig.3 Pin configuration (TEA1112A).
4

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TEA1112 전자부품, 판매, 대치품
Philips Semiconductors
Low voltage versatile telephone
transmission circuits with dialler interface
Product specification
TEA1112; TEA1112A
Receiving amplifier (pins IR, GAR and QR)
The receiving amplifier has one input (IR) and one output
(QR). The input impedance between pin IR and pin VEE is
20 k. The voltage gain from pin IR to pin QR is set at
31.2 dB (typ). The gain can be decreased by connecting
an external resistor RGAR between pins GAR and QR; the
adjustment range is 12 dB. Two external capacitors CGAR
(connected between GAR and QR) and CGARS (connected
between GAR and VEE) ensure stability. The CGAR
capacitor provides a first-order low-pass filter. The cut-off
frequency corresponds to the time constant
CGAR × (RGARint // RGAR). RGARint is the internal resistor
which sets the gain with a typical value of 100 k.
The relationship CGARS = 10 × CGAR must be fulfilled to
ensure stability.
The output voltage of the receiving amplifier is specified for
continuous wave drive. The maximum output swing
depends on the DC line voltage, the RCC resistor, the ICC
current consumption of the circuit, the Ip current
consumption of the peripheral circuits and the load
impedance.
Automatic gain control is provided on this amplifier for line
loss compensation.
Automatic gain control (pin AGC)
The TEA1112; TEA1112A perform automatic line loss
compensation. The automatic gain control varies the gain
of the microphone amplifier and the gain of the receiving
amplifier in accordance with the DC line current.
The control range is 5.8 dB (which corresponds
approximately to a line length of 5 km for a 0.5 mm
diameter twisted-pair copper cable with a DC resistance of
176 /km and an average attenuation of 1.2 dB/km).
The ICs can be used with different configurations of
feeding bridge (supply voltage and bridge resistance) by
connecting an external resistor RAGC between pins AGC
and VEE. This resistor enables the Istart and Istop line
currents to be increased (the ratio between Istart and Istop is
not affected by the resistor). The AGC function is disabled
when pin AGC is left open-circuit.
Mute function (pin MUTE; TEA1112)
The mute function performs the switching action between
the speech mode and the dialling mode. When MUTE is
LOW or open-circuit, the microphone and receiving
amplifiers inputs are enabled while the DTMF input is
disabled, depending on the MMUTE level (see Table 1).
When MUTE is HIGH, the DTMF input is enabled and the
microphone and receiving amplifiers inputs are disabled.
Mute function (pin MUTE; TEA1112A)
The mute function performs the switching between the
speech mode and the dialling mode. When MUTE is LOW
or open-circuit, the DTMF input is enabled and the
microphone and receiving amplifiers inputs are disabled.
When MUTE is HIGH, the microphone and receiving
amplifiers inputs are enabled while the DTMF input is
disabled, depending on the MMUTE level (see Table 1).
DTMF amplifier (pin DTMF)
When the DTMF amplifier is enabled, dialling tones may
be sent on line. These tones can be heard in the earpiece
at a low level (confidence tone).
The TEA1112; TEA1112A have an asymmetrical DTMF
input. The input impedance between DTMF and VEE is
20 k. The voltage gain from pin DTMF to pin LN is
25.5 dB. When an external resistor is connected between
pins REG and GAS to decrease the microphone gain, the
DTMF gain varies in the same way (the DTMF gain is
26.3 dB lower than the microphone gain with no AGC
control).
The automatic gain control has no effect on the DTMF
amplifier.
1997 Mar 26
7

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