mt88e43 Zarlink Semiconductor, mt88e43 Datasheet - Page 10

• Manufacturer Part Number: mt88e43
• Description: Extended Voltage Calling Number Identification Circuit 2
• Manufacturer: Zarlink Semiconductor

MT88E43
Application Circuits
The circuits shown in Figures 9 and 11 are
application circuits for the MT88E43.
voltage (V
device’s tone and FSK detectors will be reduced.
Therefore, to meet the BT or Bellcore tone reject
level requirements the gain of the internal opamp
should be reduced according to the graph in Figure
10. For example when V
equal 430k
V
should equal 63.4k .
shown in Figures 9 and 11.
The circuit shown in Figure 9 illustrates the use of the
MT88E43 in a proprietary system that doesn’t need to
meet FCC, DOC, and UL approvals. It should be noted
that if glitches on the tip/ring interface are of sufficient
amplitude, the circuit will falsely detect these signals as
ringing or line reversal.
The circuit shown in Figure 11 will provide common
mode rejection of signals received by the ringing circuit.
This circuit should pass safety related tests specified by
FCC Part 68, DOC CS-03, UL 1459, and CSA C22.2.
5-62
TIP / A
RING / B
DD
NOTE: Resistors must have 1% tolerance and capacitors have 20%
=3V (+/- 10%) R
: R
: R
: Crystal is 3.579545MHz, 0.1% frequency tolerance.
: For BT Application C=0.1 F 5%, R
C=0.1 F 5%, R
For applications where CAS speech immunity is required (e.g. CIDCW)
1
1
tolerance unless otherwise specified.
= 430K, R
= 620K, R
TISP4180,
TISP5180,
TPA150A12 or
TPB150B12
DD
) is decreased, the threshold of the
and R
4
4
= 34K for V
= 63K4 for V
100nF
100nF
3
22nF
5%
=825k
5%
22nF
1
5%
4
5%
499K, 5%
should equal 620k
should equal 34k ; and if
499K, 5%
DD
1N914
Resistors R
=5V (+/- 10%), R
DD
1%, R
DD
R
R
= 5V
1
1
1N914
= 3V
2
=226k
3
1N914
10% (See Figure 10)
=422k
1N4003
1N4003
1N4003
1N4003
10% (See Figure 10)
1
1N914
301K
200K
5%
5%
and R
Figure 9 - Application Circuit
1%
As supply
Vdd
Vdd
1
1%, R
and R
Vdd
should
4
R
R
Vdd
4
4
2
are
=422k
220nF
150K
4
5%
These safety tests will simulate high voltage faults that
may occur on the line. The circuit provides isolation
from these high voltage faults via R1 and the 12k1 re-
sistors as well as the 22nF & 330nF capacitors. IRC
manufactures a resistor (part number GS3) that should
be used for R1. This resistor is a 3W, 5%, 1kV power
resistor. The 12k1 resistor is manufactured by IRC (part
number FA8425F). This resistor is a 1.5W, 5%, fusea-
ble type resistor. The 22nF and 330nF capacitors have
a 400V rating.
See the application note "MSAN-164: Applications of
the MT8843 Calling Number Identification Circuit 2" for
information on designing the MT88E43 into CID and
CIDCW systems.
1%
100nF
464K
V
CAP
MODE
IN+
IN-
GS
TRIGin
TRIGRC
OSCin
OSCout
V
TRIGout
Ref
SS
MT88E43
(FSK Interface Mode 0 selected)
FSKen
PWDN
DATA
DCLK
St/GT
V
= To microcontroller
= From microcontroller
ESt
INT
CD
DR
DD
StD
IC
R
R
3
Data Sheet
2
C
Vdd
1N914
Vdd
100K
20%