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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（在轉換系統(tǒng)和用戶環(huán)間提供一個接口）) |
| 中文描述： | 可編程用戶接口（可編程用戶線路接口電路（在轉換系統(tǒng)和用戶環(huán)間提供一個接口）） |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 66K |
| 代理商： | MT91600 |
Preliminary Information
MT91600
5
When using DTMF signalling only i.e. pulse dialling
is not used, the capacitor, C7, can be permanently
connected to ground and does not require to be
switched out during dialling.
Power up Sequence
The circuit should be powered up in the following
order: AGND, VEE, VDD, V
BAT.
Application
The following Application section is intended to
demonstrate to the user the methods used in
calculating and selecting the external programming
components in implementing the MT91600 as an
analog line interface in a communication system.
The programming component values calculated
below results in the optimum performance of the
device.
Refer to Figure 5 for MT91600 components
designation.
Component Selection
Feed Resistors (R1, R2)
The selection of feed resistors, R1 and R2, can
significantly affect the performance of the MT91600.
It is recommended that their values fall in the range
of:
200
<= R1 <= 250
where, R1 = R2
The resistors should have a tolerance of 1% (0.15%
matched) and a power rating of 1 Watt.
Loop Current Setting (R3, R4, C9)
By using a resistive divider network, (Figure 3), it is
possible to maintain the required voltage at Vref to
set I
LOOP
. The loop current programming is based on
the following relationship:
I
LOOP
= - [ F * V
+ G * V
BAT
] * K
o
* H
(R1 +R2)
where,
F = R4 / (R4 + R3)
G = R3 / (R4 +R3)
K
o
= 200000 / (200000 + (R4//R3) )
H = 1.07
I
LOOP
is in Ampere
From Figure 3 with R1 = R2 = 220
For I
LOOP
= 25mA, V
LC
= 0V, Vbat=-48V
Figure 3 - Resistor Divider
C9 is inserted to ensure pin 6, Vref, remains at a.c.
ground. 100nF is recommended.
I
LOOP
can also be set by directly driving Vref with a
low impedance voltage source. (See Figure 4). It is
recommended that a small resistor be placed in
series with the Vref pin. In this case:
I
LOOP
= 1.07 * Vs
(R1 +R2)
where, Vs < 0
Figure 4 - Direct Voltage
Calculating Component Values For AC
Transmission
There are five parameters a designer should know
before starting the component calculations. These
five parameters are:
1) characteristic impedance of the line Z
o
2) network balance impedance Z
NB
3) value of the feed resistors (R1 and R2)
4) 2W to 4W transmit gain
5) 4W to 2W receive gain
The following example will outline a step by step
procedure for calculating component values. Given:
R3
43k
V
LC
V
REF
6
MT91600
R4
130k
V
BAT
C9
100nF
2k
V
REF
6
MT91600
C9
100nF
Vs
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相關代理商/技術參數(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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