AN1500A
7.1 Setting a/b line connection
J1 allows selection of a/b line terminals to
easily adapt the demo board to various
PTT line connections:
inner two pins (default)
outer two pins (optional)
J1
J1
7.2 Connecting a handset
A handset connected at Z2 should have the following
connections:
Handset
remark: observe polarity of the electret microphone
7.3 Setting dialing mode
LD Mode
make/break
ratio 1:2
LD Mode
make/break
ratio 2:3
By J2, a selection of 3 different dialing modes can be
made, 2 pulse (=LD) dialing modes and a DTMF
dialing mode.
MF Mode
If LD Mode is selected then it is possible to switch
into MF mode by pressing the ! key but the mode
will return to LD after a hookswitch operation or after
a Recall (flash). In LD mode pulsing is at 10 pulses
per second.
J2
J2
J2
7.4 Setting line loss compensation (AGC)
Line loss compensation = line current dependent
gain setting of Tx and Rx amplifiers can be set by
jumper setting to 3 different modes : high, low and
no LLC (=default).
LLC 45 to 75mA LLC 20 to 50mA
no LLC
J3
J3
J3
7.5 AC impedance
The Characteristic or output impedance of the SA2532K is set internally to 600Ω. No further components are
required. For a complex impedance refer to pt 11.
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sa m e s
SAMES [ SAMES ]
