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参数资料
| 型号： | W91030BS |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | 无绳电话/电话 |
| 英文描述： | TELEPHONE CALLING NO IDENT CKT, PDSO24 |
| 封装： | 300MIL, PLASTIC, SOP-24 |
| 文件页数： | 31/32页 |
| 文件大小： | 245K |
| 代理商： | W91030BS |
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W91030B
Publication Release Date: Sep. 27, 2005
- 8 -
Revision A2
7.3
Dual Tone Alert Signal Detection
The dual tone alert signal is separated into high and low tones and detected by a high/low tone
detector. The dual tone alert signal detection circuit is always enabled when the W91030B/BS is not in
sleep state. The ALGR is the output of the dual tone detector and when high indicates that the high
tone and low tone alert signals have been detected. The guard time improves detection performance
by rejecting detected signals with insufficient duration and by masking momentary detection dropout.
Figure 7-4 shows the relationship between the ALGR, ALGRC and ALGO pins and Figure 7-5 shows
the guard time waveform of the same pins. The total recognition time is tREC = tDP + tGP, where tDP is
the tone present detect time and tGP is the tone present guard time. The tone present guard time is
the RC time constant with the capacitor discharging from VSS to VDD ( the ALGRC pin discharges
from VSS to VDD through a resistor). The capacitor will discharge rapidly via a discharge switch after
ALGO returns high. The total absent time is tABS = tDA + tGA, where tDA is the tone absent detect time
and tGA is the tone absent guard time. The tone absent guard time is the RC time constant with the
capacitor charging from VDD to VSS (the ALGRC pin charges from VDD to VSS through a resistor). The
capacitor will charge rapidly via a charge switch after ALGO returns low. To obtain unequal present
and absent guard times, a diode can be connected as shown in Figure 7-6, to give the unequal
resistance required during capacitor charging and discharging.
Figure 7-4. Guard Time Circuit of Dual Tone Alert Signal Detection
Dual tone detected
VCPth
-
+
Comparator
11
ALGRC
ALGR
ALGO
VDD
R
C
Discharge
Switch
Charge
Switch
Capacitor
Charge/Discharge
Control Circuit
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相关代理商/技术参数 |
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