BT8370KPF

Manufacturer Part NumberBT8370KPF
DescriptionFully integrated T1/E1 framer and line interface
ManufacturerConexant Systems, Inc.
BT8370KPF datasheet
 


Specifications of BT8370KPF

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External Component Specifications

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4.0 Applications
4.1 External Component Specifications
Figure 4-2. Option B: Long Haul with No Ground Reference (2 of 2)
NOTE(S):
(1)
Line side secondary surge protection to meet FCC Part 68, Bellcore TR-NWT-001089, and IEC 1000-4-5 requirements.
These components are: 1. TVS-LC01-6 Semtech, 2. PTC-TR600-160 Raychem, or 1. Thyristor (Sidactor)—Teccor
P0300SB, 2. PTC-TR600-160 Raychem can be used.
An LC01-6 device provides protection during high surge lightning tests. It is designed to shunt the surge current with a
maximum clamping voltage of 16 V maximum, below the transformer saturation point.
A Thyristor (Sidactor—Teccor P0300SB) clamps the voltage at 40 V maximum.
A PTC device is used for power cross faults, meeting the requirements of Bellcore 1089 and UL1459.
(2)
Chip side Secondary surge protection. Diodes should be low capacitance, fast turn-on Schottky or surge protection
diodes. These components are: 1. Schottky Diode—11DQ04 (disrete) or 10BQ040 (surface mount) International Rectifier,
2. two 2.1 , 1/4 W, 1% Resistors. The two 470
into the device while the power is off and T1/E1 lines are connected.
(3)
Optional programmable receive termination –75/100/120 .
(4)
Optional fixed transmit termination. The value shown provides acceptable transmit return loss for T1 and E1 applications.
(5)
Required fixed receive termination. The parallel combination of the fixed termination and programmable termination plus
the primary surge protection line feed resistor (PTC) must match the line impedance.
(6)
VSET Resistor. The VSET resistance value controls the transmit signal amplitude and depending on the line feed resistance
(PTC) in the primary surge protection circuit, its value can be fine-tuned. Use R (VSET) = 14 k if total line feed resistance is
0 to 12 .
(7)
The Physical area between the connector and chokes should be kept small in order to avoid high frequency coupling and to
improve emissions test. Another good option is to place chokes between PTC and Line side surge protection device. If
common mode noise is a concern then use the through hole package (PE65854) at the connector.
4-6
Fully Integrated T1/E1 Framer and Line Interface
resistors in series with RTIP/RRING are used to limit the current going
Conexant
Bt8370/8375/8376
N8370DSE