This document provides specifications for HDSL line transformers for use with Conexant's RS8973 HDSL chipset. It lists electrical specifications, additional specifications, and mechanical details for two transformer models, the B1020 and B1040. The transformers are designed to meet safety standards and have excellent linearity and insertion loss performance.

1. HDSL LINE TRANSFORMERS
For use with Conexant’s RS8973 HDSL chipset
Excellent THD performance
Small footprint
Designed to meet UL 1950 and EN 60950
requirements for supplementary insulation
and a 250 V working voltage
Electrical Specifications @ 25°C — Operating Temperature -40°C to +85°C
Part Turns Ratio OCL Leakage Inductance Longitudinal
Number Mounting (± 2%) (± 6%) (TYP) Balance
(line - chip) 1-5 (2-4 shorted) (from 30 KHz to 300 KHz)
B1020 THT 2:1 2.00 mH 15.0 µH -50 dB MIN
B1040 1 SMT 2:1 2.00 mH 15.0 µH -50 dB MIN
Additional Specifications
Part THD DC Resistance Isolation Voltage Insertion Loss
Number (Linearity) Primary Secondary (Vrms) (from 30 KHz to 580 KHz)
B1020 -70 dB MIN @ 20 KHz 2.5 MAX9 1.0 MAX 9 1500 0.65 dB
B1040 1 -70 dB MIN @ 20 KHz 2.5 MAX9 1.0 MAX 9 1500 0.65 dB
1
Transformers are shipped in tubes unless tape and reel is specified. Please add the suffix “T” (i.e. B1040T) for tape and reel orders.
Mechanicals
B1020 B1040
10 X .028 ± .002
.605
0,71 ± 0,05 15,37
.695 .100
17,65 MAX
B1020
Date Code 2,54
Country of Mfg.
.530 .394 .394
13,46 B1040 .098 10,00 10,00
Date Code MAX
MAX Country of Mfg. 2,50
.500
12,70MAX 10 X .051 ± .002
.098
.516 1,30 ± 0,05 2,50
13,11MAX
.173 ± .015
4,39 ± 0,38
.485
.018 .098
10 X 12,32
0,46 2,50
.394 .394 MAX
10,00 10,00
.550 .547 .005/0,13
13,97MAX 13,89MAX 10 SURFACES
Schematic
Weight . . . . . . . . . . . . . .6.2 grams
Tray . . . . . . . . . . . . . . . . . .60/tray 2:1
Dimensions: Inches 1
mm
Unless otherwise specified, 4 9
all tolerances are ± .010 Pri 2 Sec
0,25 7
5
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PRELIMINARY B952.P (4/00)