PvtSQUELCHTM CTCSS Encoder/Decoder
12
MX375
Operating Characteristics Notes:
1. These values are obtained using the external integrating components given in Figure 2.
2. An emitter follower output
3. With an input signal of 1 kHz @ 0dB.
4. Under Composite Signal test conditions.
5. Any programmed tone with RL=600 Ω, CL=15pF, including any response to a phase reversal instruction.
6. f0 > 100 Hz, (for 100Hz > f0 > 67Hz: t = [100/f0(Hz)] x 250ms).
7. Input ac short-circuit, audio path enabled.
8. Due to frequency inversion, these figures reflect the difference from the ideal response.
9. Reference 156.7 Hz (MX175 and MX275).
6.2 Timing Information
6.2.1 Serial Loading
Min.
Typ.
Max.
Unit
Serial Mode Enable Set Up Time
(t
250
-
-
ns
)
SMS
Clock “High” Pulse Width (t
Clock “Low” Pulse Width (t
)
250
250
150
50
-
-
-
-
-
-
-
-
-
-
-
-
ns
ns
ns
ns
ns
ns
PWH
)
PWL
Data Set Up Time (t
)
DS
Data Hold Time (t
)
DH
Load/Latch Set Up Time (t )
250
150
LL
Load/Latch Pulse Width (t
)
LLW
Table 9: Serial Loading Timing Information
D4
SERIAL MODE
ENABLE
D5
tSMS
tPWH
tPWL
SERIAL CLOCK
tDH
tDS
SERIAL DATA
INPUT
tLL
tLLW
LOAD/LATCH
Figure 4: Serial Loading Timing
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480026.007
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