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TEA1111AT датащи(PDF) 9 Page - NXP Semiconductors

номер детали TEA1111AT
подробное описание детали  Speech circuit with dialler interface, regulated supply and earpiece volume control
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1111AT датащи(HTML) 9 Page - NXP Semiconductors

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1999 Nov 22
9
Philips Semiconductors
Product specification
Speech circuit with dialler interface, regulated
supply and earpiece volume control
TEA1111A
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
Ω (2 × 34 kΩ). The voltage gain from pins MIC+/MIC−
to pin LN is set at 44.2 dB (typical) at 600
Ω 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 kΩ
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
Ω. 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 kΩ typical) which sets
the gain. The relationship CGARS =10 × CGAR must be
complied with to ensure stability.
The output voltage of the earpiece 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.
VOLUME CONTROL (PIN VCI)
A positive DC voltage applied to pin VCI allows the gain of
the earpiece amplifier to be increased in steps of 4.85 dB.
The volume control range is 27.4 to 41.9 dB (14.5 dB
typical). A proportional voltage decoder at pin VCI defines
a gain of 27.4 dB when VVCI equals VEE and a gain of
41.9 dB when VVCI equals VDD.
The intermediate steps correspond to:
and
.
Automatic gain control (pin AGC)
The TEA1111A performs automatic line loss
compensation. The automatic gain control varies the gain
of the microphone amplifier and the gain of the receive
amplifier in accordance with the DC line current.
The control range is 6.0 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
Ω/km and an average attenuation of 1.2 dB/km).
The IC 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)
The mute function performs the switching between the
speech mode and the dialling mode.
When MUTE is LOW, the DTMF input is enabled and the
microphone and receive amplifier inputs are disabled.
In this mode, the DTMF tones are sent to the receive
output at a low level (confidence tone).
When MUTE is HIGH, the microphone and receiving
amplifiers inputs are enabled while the DTMF input is
disabled. The MUTE input is provided with an internal
pull-up current source to VDD.
V
VCI
1
3
--- VDD
=
V
VCI
2
3
--- VDD
=


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