BT8376EPF datasheet(103/323 Pages) CONEXANT

103 / 323 page

Bt8370/8375/8376

2.0 Circuit Description

Fully Integrated T1/E1 Framer and Line Interface

2.9 Transmit Line Interface Unit

N8370DSE

Conexant

2-75

The VSET resistor not only provides a bias current to RPLL and TPLL but

also controls the height of the transmit pulse. The VSET value can be fine tuned

according to the total resistance on the line side. Table 2-23 shows the measured

Peak value of the transmit pulse. (Please refer to Figures 4-1 through 4-4 for the

recommended front-end circuitry.)

The minimum series resistance required with XTIP/XRING is 2.1

Ω . The two

2.1

Ω series resistors, together with the Shottky diodes, are necessary to protect

the part against surge voltages of up to 50 V (please refer to Section 4,

Applications). The line side protection circuitry should break down the voltage to

50 V so that the chip side protection circuitry (two 2.1

Ω series resistors with

Shottky diodes) can protect the part for surge voltages of 50 V or below.

Table 2-23. Transmit Pulse

Rterm

Ω

VPk

2.36

2.30

2.28

100

Ω

LH =

2.96

SH =

3.16

LH =

2.96

SH =

3.12

LH =

2.88

SH =

3.00

LH =

2.80

SH =

3.04

120

Ω

2.96

2.90

2.84

PTC

One

Two

Tx Series

Resistance

2.1

Ω in series

with XTIP and

XRING

2.1

Ω in series

with XTIP and

XRING

2.1

Ω in series

with XTIP and

XRING

VSET (

Ω)

14 k

Tx Termination

(

Ω)

51.1

NOTE(S):

LH refers to Long Haul, and SH refers to Short Haul.

BT8376EPF Datasheet(PDF) 103 Page - Synaptics Incorporated.

BT8376EPF Datasheet(HTML) 103 Page - Synaptics Incorporated.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL