MT88E43AE 查看數據表（PDF） - Zarlink Semiconductor Inc
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MT88E43AE Datasheet PDF : 26 Pages
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MT88E43
Data Sheet
TIP / A
RING / B
TISP4180,
TISP5180,
TPA150A12 or
TPB150B12
22nF
5%
22nF
5%
Vdd
1N4003
R4
R1
1N4003
Vdd
1N4003
R4
R1
1N4003 Vdd
499K, 5%
100nF
5%
1N914
1N914
1N914
499K, 5%
200K
5%
1N914
301K
100nF
5%
5%
Vdd
150K
5%
220nF
464K
100nF
Vdd
MT88E43
IN+
IN-
GS
VRef
CAP
TRIGin
TRIGRC
TRIGout
MODE
OSCin
OSCout
VSS
VDD
St/GT
ESt
StD
INT
C
R3
R2
Vdd
100K
20%
1N914
CD
DR
DATA
DCLK
FSKen
PWDN
IC
NOTE: Resistors must have 1% tolerance and capacitors have 20%
tolerance unless otherwise specified.
: Crystal is 3.579545MHz, 0.1% frequency tolerance.
: For BT Application C=0.1µF ±5%, R3=422kΩ ±1%, R2=422kΩ ±1%
: For applications where CAS speech immunity is required (e.g. CIDCW)
C=0.1µF ±5%, R3=825kΩ ±1%, R2=226kΩ ±1%
: R1 = 430K, R4 = 34K for VDD = 5V ± 10% (See Figure 10)
: R1 = 620K, R4 = 63K4 for VDD = 3V ± 10% (See Figure 10)
= To microcontroller
= From microcontroller
(FSK Interface Mode 0 selected)
Figure 9 - Application Circuit
Application Circuits
The circuits shown in Figures 9 and 11 are
application circuits for the MT88E43. As supply
voltage (VDD ) is decreased, the threshold of the
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 VDD=5V (+/- 10%), R1 should
equal 430kΩ and R4 should equal 34kΩ; and if
VDD=3V (+/- 10%) R1 should equal 620kΩ and R4
should equal 63.4kΩ. Resistors R1 and R4 are
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.
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 12k1Ω 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.
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
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