HT9033 Ver la hoja de datos (PDF) - Holtek Semiconductor
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HT9033 Datasheet PDF : 9 Pages
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HT9033
A.C. Characteristics
Symbol
Parameter
Low Tone Frequency
High Tone Frequency
Frequency Deviation Acceptance
Frequency Deviation Reject
Acceptable Signal Level per Tone
Reject Signal Level per Tone
Twist Accept Limit
Signal to Noise Ratio
tDET
Present Detect Time
Test Conditions
VDD
Conditions
Min.
5V
¾
¾
5V
¾
¾
5V
Range within which,
tones are accepted
¾
5V
Range outside of which,
tones are rejected
±2.5
5V No speech
-33
5V No speech
¾
5V
¾
¾
5V
¾
¾
5V
¾
¾
Typ.
2130
2750
¾
¾
¾
-36
±7
-19
55
Ta=25°C
Max. Unit
¾ Hz
¾ Hz
±0.7 %
¾
%
0 dBm
¾ dBm
¾ dB
¾ dB
¾ ms
Clock (System Frequency)
Symbol
Parameter
fC
tLHCL
tHLCL
DCCL
Clock Input Frequency
Clock Input Rising Time
Clock Input Falling Time
Clock Input Duty Cycle
Test Conditions
VDD
Conditions
5V
¾
5V
¾
5V
¾
5V
¾
Ta=25°C
Min. Typ. Max. Unit
3.5759 3.5795 3.5831 MHz
¾
¾ 110 ns
¾
¾ 110 ns
40
50
60
%
Functional Description
Power Down Mode
If PDWN pin= 1, the HT9033 is in reset status and the
CAS detector is at power down mode, all function is dis-
able. The oscillator circuit will be stop.
If PDWN pin= 0, CAS detector is activated.
CAS Detector Output Signal
The output pin DO is CMOS structure. At the normal sta-
tus (CAS tone is not presence), the DO pin output low.
When the CAS tone is detected, the DO pin will output
high level.
CAS Detector Timing
C o n d itio n 1 (S ta n d a r d C A S T o n e ):
80m s
C A S Tone
DO
tD E T
t o ff
C o n d itio n 2 (C o n tin u o u s C A S T o n e ):
C A S Tone
DO
tD E T
t D u r a tio n
t D o ff t D u r a tio n
tD o ff
Parameter
Note
Min.
Typ.
Max.
Unit
tDET
CAS Detecting Time
¾
55
¾
ms
toff
DO Off Time
¾
8
¾
ms
tDuration
DO Duration Time
¾
145
¾
ms
tDoff
DO Duration Off Time
¾
48
¾
ms
If the CAS tone is presence more than tDET time, the CAS tone will be detected, then the DO will output high.
Rev. 1.00
3
May 22, 2006
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