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參數(shù)資料
| 型號： | HT9033 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | CAS Tone Detector |
| 中文描述： | 中科院音調檢測器 |
| 文件頁數(shù)： | 3/9頁 |
| 文件大?。?/td> | 101K |
| 代理商： | HT9033 |
A.C. Characteristics
Ta=25 C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
Low Tone Frequency
5V
2130
Hz
High Tone Frequency
5V
2750
Hz
Frequency Deviation Acceptance
5V
Range within which,
tones are accepted
0.7
%
Frequency Deviation Reject
5V
Range outside of which,
tones are rejected
2.5
%
Acceptable Signal Level per Tone
5V
No speech
33
0
dBm
Reject Signal Level per Tone
5V
No speech
36
dBm
Twist Accept Limit
5V
7
dB
Signal to Noise Ratio
5V
19
dB
t
DET
Present Detect Time
5V
55
ms
Clock (System Frequency)
Ta=25 C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
f
C
Clock Input Frequency
5V
3.5759 3.5795 3.5831
MHz
t
LHCL
Clock Input Rising Time
5V
110
ns
t
HLCL
Clock Input Falling Time
5V
110
ns
DC
CL
Clock Input Duty Cycle
5V
40
50
60
%
HT9033
Rev. 1.00
3
May 22, 2006
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
'
'
"
"
- .
0
0
Parameter
Note
Min.
Typ.
Max.
Unit
t
DET
CAS Detecting Time
55
ms
t
off
DO Off Time
8
ms
t
Duration
DO Duration Time
145
ms
t
Doff
DO Duration Off Time
48
ms
If the CAS tone is presence more than t
DET
time, the CAS tone will be detected, then the DO will output high.
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