MT91600 Ver la hoja de datos (PDF) - Zarlink Semiconductor Inc

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componentes Descripción

Fabricante

MT91600

Programmable SLIC

Zarlink Semiconductor Inc 

MT91600

Data Sheet

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:

200Ω <= R1 <= 250Ω

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 ILOOP.

The loop current programming is based on the following relationship:

ILOOP = - [ F * VLC + G * VBAT] * Ko * H

(R1 +R2)

where,

F = R4 / (R4 + R3)

G = R3 / (R4 +R3)

Ko = 200000 / (200000 + (R4//R3) )

H = 1.07

ILOOP is in Ampere

From Figure 3 with R1 = R2 = 220Ω

For ILOOP = 25mA, VLC = 0V, Vbat=-48V

R3

43kΩ

VLC

6 VREF

C9

100nF

R4

130kΩ MT91600

VBAT

Figure 3 - Resistor Divider

6

Zarlink Semiconductor Inc.

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