MC34216A Datasheet, PDF (17/20 Pages) Motorola, Inc – PROGRAMMABLE TELEPHONE LINE INTERFACE CIRCUIT WITH LOUDSPEAKER AMPLIFIER

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The dc mask of the MC34216A can be programmed to fit
the different country requirements. During startup, this will be
the first register which has to be programmed in order to have
a dc setting as soon as possible.
The pulse–dialing is timed by the microcontroller
(make/brake ratio, inter–digit pause) by making the LD bit
high and low. Also, memory dialing or last number redial can
be done. During LD = 1, the MC34216A makes its output
LAO low for the line break and reduces its internal current
consumption. The current through the microphone can be
stopped also by making bit MicP low.
The transmit path can be muted by making the MicM bit
low. It effectively mutes both the signal from the handset
microphone as well as the signal coming from a
speakerphone circuit. During this microphone mute state, a
melody can be sent to the line (melody on hold). In order to
enable the idle tone function, the IT bit has to be made high.
The squelch function can be enabled by making the Mth bit
low. The line AGC feature can be enabled by making the
GR bit low.
The receive path can be muted by making the EM bit low.
It effectively mutes both the signal from the line to the
handset earpiece as well as to the loudspeaker output.
During this mute state, a pilot tone melody can be sent to the
earpiece or loudspeaker. This is very useful during
pulse–dialing, programming of telephone numbers in
memories or during operation of an answering or fax
machine. In order to enable the pilot tone function, the PT bit
has to be made high. The gain of the earphone amplifier can
be increased by 6.0 dB by making the EA bit high.
MOTOROLA ANALOG IC DEVICE DATA
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