參數(shù)資料
型號(hào)： 935263011118
廠商： NXP SEMICONDUCTORS
元件分類： 通信及網(wǎng)絡(luò)
英文描述： SPECIALTY TELECOM CIRCUIT, PDSO16
封裝： PLASTIC, SOT-162, SO-16
文件頁(yè)數(shù)： 16/33頁(yè)
文件大?。?/td> 574K
代理商： 935263011118
Philips Semiconductors
PCD3316
CIDCW receiver
Product specication
11 March 1999
23 of 30
9397 750 04824
Philips Electronics N.V. 1999. All rights reserved.
Unrestr
icted
11. Test information
11.1 Application note on Customer Premises Equipment (CPE) testing
Under certain circumstances, some external CIDCW test equipment may generate
incorrect pulses after the ringing signal becomes inactive. These pulses may cause
the FSK detector of the PCD3316 to respond. Note that this is by no means an
incorrect behaviour of the PCD3316 chip, but a correct detection of incorrect test
stimuli. However, if not known, it may lead to confusing results during testing of the
CPE.
To avoid the issue described above, following work-around can be used:
1. Disable the FSK detection of PCD3316, before and during the ringing signal
detection.
2. Switch on the FSK detection only after a certain period, e.g. 100 ms after the
ringing signal goes inactive.
3. When the rst FSK data is detected, e.g ‘55H’ (possible part of channel seizure),
switch off the FSK detection and on again. This will force the FSK detector to
resynchronize and detect the normal FSK data correctly. It may be necessary to
repeat this sequence a number of times to ensure that the data detected really
comes from the channel seizure. Thus, it is recommended to wait for a multiple
number of bytes ‘55H’ to be detected to validate a correct channel seizure.
Attenuation networks to connect the polarity and FSK inputs to
the telephone line.
High-pass lter (cut-off
frequency
≈ 1 kHz) to improve
performance of CAS detection.
a.
Attenuation networks.
b.
High-pass lter.
Fig 16. Application diagrams.
MGK729
820 k
100 k
100 k
820 k
100 k
100 k
POL0
POL1
a/b
b/a
FSKIN
+
FSKIN
11
10
14
15
1 nF
PCD3316
2.2
F
(250 V)
2.2
F
(250 V)
telephone
line
ook, halfpage
MBH996
CASIN
13
120 k
100 nF
1.8 nF
PCD3316
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