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參數(shù)資料
| 型號： | MT91600 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Programmable SLIC(可編程用戶線路接口電路（在轉(zhuǎn)換系統(tǒng)和用戶環(huán)間提供一個(gè)接口）) |
| 中文描述： | 可編程用戶接口（可編程用戶線路接口電路（在轉(zhuǎn)換系統(tǒng)和用戶環(huán)間提供一個(gè)接口）） |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 66K |
| 代理商： | MT91600 |
MT91600
Preliminary Information
6
Z
o
= 600
, Z
NB
= 600
, R1=R2= 220
Gain 2 - 4 = -1dB, Gain 4 - 2 = -1dB
Step 1: Gain Setting (R12, R13, R14, R15)
Gain 2 - 4 = 20 Log [ R13 / R12]
-1 dB = 20 Log [R13 / R12]
∴
R12 = 112.2k
, R13 = 100k
.
Gain 4 - 2 = 20 Log [0.891 * [R14 / R15)]
-1 dB = 20 Log [0.891 * [R14 / R15)]
∴
R14 = 100k
, R15 = 100k
.
Step 2: Impedance Matching (R11, R18, R19, C8)
a)
Z
o
/ ( R1+R2) = kZ
o
/ R11
600/(220+220) = (k*600)/R11
let k = 125
∴
R11 = 55k
.
b)
In general,
kZ
o
= Z
LZ
where:
Z
LZ
= R18, for a resistive load.
Z
LZ
= [R18 + (R19 // C8)], for a complex load.
Since we are dealing with a resistive load in this
example Z
LZ
= R18, and therefore:
kZ
o
= R18
(125 * 600)= R18
∴
R18 = 75k
.
Step 3: Network Balance Impedance (R16, R17)
R17
R17 + R16
= [1.782 * Z
o
/ ( Z
o
+Z
NB
) * ( R13 / R12 )]
[1 + R13 / R12)]
R17
R17 + R16
= 0.4199
set R17 = 100k
, R16 becomes 138k
.
∴
R16 = 138k
, R17 = 100k
.
Complex Line Impedance, Z
o
In situations where the characteristic impedance of
the line Z
o
is a complex value, determining the
component values for impedance matching (R11,
R18, R19, C8) is as follows:
Given Z
o
= 220
+ (820
// 120nF)
Z
o
/ ( R1+R2) = kZ
o
/ R11 (Equation 1)
where, kZ
o
= [R18 + (R19 // C8)]
Choose a standard value for C8 to find a suitable
value for k.
Since 1nF exists, let C8 = 1nF then,
k = 120nF / C8
k = 120nF / 1nF
∴
k =120
R18 = k * 220
R18 = 120 * 220
R18 = 26400
R19 = k * 820
R19 = 120 * 820
R19 = 98400
∴
R18 = 26k4
, R19 = 98k4
From (Equation 1)
R11 = k * (R1 + R2)
R11 = 120 * (220
+ 220
)
∴
R11 = 52k8
Power Sharing Resistor (R23)
To determine the value of R23, use the following
equations:
R23(max)= |Vbat(min)| - 100 - (2*R2 + Lr + DCRP)
30mA
R23(min)= |Vbat(max)| - Pd(max) - R2
40mA 1.6mA
where,
Vbat(min/max) = the expected variation of Vbat.
R2 = the feed resistor.
Lr = maximum DC loop resistance.
DCRP = DC resistance of the phone set.
Pd(max) = the maximum power dissipation of the
ring drive transistor Q3.
If R23(max) > R23(min), then set R23 to be the
geometric center:
R23 = Square Root (R23(max) * R23(min))
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT91600AN | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Programmable SLIC |
| MT91600AN1 | 制造商:Microsemi Corporation 功能描述:SLIC 1CH 55DB 32MA 5V 28SSOP - Rail/Tube 制造商:Zarlink Semiconductor Inc 功能描述:SLIC 1CH 55DB 32MA 5V 28SSOP - Rail/Tube |
| MT91600ANR | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Programmable SLIC |
| MT91600ANR1 | 制造商:Microsemi Corporation 功能描述:SLIC 1CH 55DB 32MA 5V 28SSOP - Tape and Reel |
| MT9160AE | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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