NW6003 Datasheet, PDF (13/21 Pages) Integrated Device Technology – TYPE II CALLER ID DECODER

NW6003 TYPE II CALLER ID DECODER
INDUSTRIAL TEMPERATURE RANGE
TE in loop state (off-hook)
Start Point
Speech path disabled
A/B wires
Note 2
Alert Signal
ACK
A
B
C
D
E
PWDN
FSKEN
Note 4
Note 3
Note 5
Mark
Message
F
G
Speech path restored
H _{Note 1}
Note 6
STD
INT
...
CD
DR
...
DCLK
DATA
Data
Figure 16. BT Loop State (Off-hook) Data Transmission Timing Diagram
Notes:
1) A= 40 - 50 ms, B= 80 - 85 ms, C≤ 100 ms, D= 65 - 75 ms, E= 5- 100ms, F = 45 - 75 ms, G depends on data length, H ≤ 100 ms.
2) If AC power is not available, the designer may use the line power when the TE goes into loop state (off-hook) and use battery power while on-hook.
3) If the end office fails to send the FSK signal, the TE should disable FSKEN to unmute the handset and enable the keypad after this interval.
4) When FSK signal is not expected, the FSKEN pin should be set low to disable the FSK demodulator.
5) FSKEN should be high as soon as the TE has finished sending the acknowledgement signal ACK.
6) FSKEN should be low when CD become inactive.
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