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參數(shù)資料
| 型號(hào)： | MT91610 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Analog Ringing SLIC |
| 中文描述： | 模擬振鈴用戶接口 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 251K |
| 代理商： | MT91610 |
Preliminary Information
MT91610
7
Given the parameters as follows:
Ra = Rb = 100
Expected maximum loop impedance = 1.6k
(
including Ra and Rb)
Desirable Loop Current = 20mA
6*VREF=8V
Then | VBAT | (min) = 1600 * 0.020 +10 = 42V
Assume that the VBAT of 42V is available, then read
the value of R2 from Figure 6, which is 72k
.
Step 5: Calculation Of Non-Clipping Sinusoidal
Ringing Voltage At Tip Ring (VTR)
Assume the peak Ringing Current is less than 50mA,
the ringing voltage (20Hz) at Tip and Ring is given
as:
VTR (rms) = 0.707 * {| VBAT | + VDCRI - (15.6 *
VREF)}
VDCRI= Positive DC voltage at DCRI pin
VBAT = Negative Battery voltage
VREF= Positive DC voltage at VREF pin
AC voltage at the RV input pin is therefore
RV (rms)~= VTR (rms) / 50
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