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参数资料
| 型号： | U3900BM-AFN |
| 英文描述： | Programmable Telephone Audio Processor |
| 中文描述： | 程控电话音频处理器 |
| 文件页数： | 26/34页 |
| 文件大小： | 762K |
| 代理商： | U3900BM-AFN |
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U3900BM
Rev. A2, 25-Aug-98
Target Specification
32 (34)
Electrical Characteristics (continued)
Parameters
Test Conditions / Pins
Symbol
Min.
Typ.
Max.
Unit
Fig.
Alert tone detection
Low tone frequency
fl
2130
Hz
High tone frequency
fh
2750
Hz
Frequency deviation
accept
Range within which tones
are accepted
±0.75
%
Frequency deviation
reject
Range within which tones
are rejected
±3.5
%
Accept signal level per
tone
37.78
0.22
dBm
Reject signal level per
tone
–43.78
dBm
Positive and Negative
twist accept
7
dBm
Noise tolerance
Band-limited random noise
300 to 3400 Hz. Present
only when tone is present.
SNR
TONE
tbd
20
tbd
dB
Speech tolerance
Speech level is in ASL
(Active Speech Level).
Over the CAS signal level
range –16 dBm to –30 dBm
per performance objectives
stated in SR-TSV-002476
appendices A&B.
tbd
tbd
tbd
dB
Tone alert guard time and wetting pulse signal
Early guard time – 1
– 2
– 3
– 4
Disabled
egt
–
8.3
10.1
13.4
–
8.5
10.3
13.7
–
8.7
10.5
14.0
ms
Up guard time
– 1
– 2
– 3
– 4
ugt
19.5
24.5
29.5
34.5
20
25
30
35
20.5
25.5
30.5
35.5
ms
Down guard time – 1
– 2
– 3
– 4
dgt
17.5
19.5
21.5
24.5
18
20
22
25
18.5
20.5
22.5
25.5
ms
Wetting pulse signal
delay
Delay after the Alert Signal
falling edge
wpd
14.8
15
15.2
ms
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