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TP5700AM Scheda tecnica(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte TP5700AM
Spiegazioni elettronici  Telephone Speech Circuit
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

TP5700AM Scheda tecnica(HTML) 4 Page - National Semiconductor (TI)

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Functional Description (Continued)
vides automatic gain compensation to reduce the gain as
loop length decreases The AGC range can be adjusted by
means of RAGC to limit the maximum loss on a short loop
from 0 to 6 dB
RECEIVE AMPLIFIER
This buffer amplifier provides the necessary gain or loss for
the receive signal RCV IN should be AC coupled to SIDE-
TONE (pin 4) Automatic gain control is built into the amplifi-
er to reduce the gain as loop length decreases The AGC
range is adjusted in common with the transmit AGC range
with a range of adjustment for maximum loss from 0 to 6 dB
Push-pull complementary outputs provide balanced direct
drive to a dynamic transducer which may have an imped-
ance as low as 100X The effective receive gain can be
reduced by adding a resistor in series with the transducer
The receive gain is automatically reduced by 20 dB when
the MUTE input is pulled high
SIDETONE CIRCUIT
The level of Sidetone cancellation may be adjusted by con-
necting an external balance impedance to SIDETONE (pin
4) and coupling this point to Va For good sidetone cancel-
lation the balance impedance should be approximately 10
times the subscriber line input impedance Some typical
component values to match a precise 600X termination for
test purposes are shown in
Figure 2 Use the component
values shown in the Applications Section for better results
over a wide range of telephone line impedances
DTMF AMPLIFIER
An additional transmit amplifier is included to enable the
open-emitter output of a conventional DTMF generator to
be connected to the line via the transmit output stage This
path includes the transmit AGC section When the MUTE
input is pulled high the DTMF input is enabled and the MIC
input disabled When MUTE IN is open-circuit or pulled to
Vb the DTMF input is switched off and the MIC input is
enabled
VOLTAGE REGULATOR OUTPUTS
A precision band-gap voltage reference controls a regulator
to provide bias for internal circuits Two auxiliary outputs are
also available VREG1 is provided specifically for powering a
low voltage pulse dialer or DTMF generator In order to pro-
tect this output in low voltage situations where the instanta-
neous voltage across the Speech Circuit may swing below
the VREG1 output voltage an internal switch controls the
maximum available output current In speech mode MUTE
IN is low VREG1 output will track approximately
the Tip-
Ring voltage and the available output current is limited to
200 mA This is adequate to power a DTMF generator in
standby mode When MUTE IN is pulled high to switch the
Speech Circuit to the DTMF dialing mode
VREG1 is
switched to a 3V regulated output and up to 2 mA may be
drawn from it to power the active DTMF generator
A 12V regulated output is also provided at VREG2 to power
a low voltage 2-wire electret microphone such as the Primo
EM80-PMI2
TLH5201 – 4
See Figure 3
Note
ZBAL circuit shown is for test purposes with a resistive line termination See Applications Information for suggested component values for normal reactive line
applications
FIGURE 2 TP5700A Telephone Speech Circuits
4


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