PE-68828T Datasheet, PDF (7/8 Pages) Pulse A Technitrol Company – T1/CEPT/ISDN-PRI TRANSFORMERS

T1/CEPT/ISDN-PRI TRANSFORMERS
Application Notes
1. Extended Temperature Range Models — For extended temperature range
transformers (-40°C to +85°C operating temperature range), OCL (Open
Circuit Inductance for the primary winding) is specified at both -40°C and
+25°C. At -40°C, OCL is 600 µH minimum for all low temperature models with
the exception of PE-68827 which is 800 µH minimum and PE-65836 which is
300 µH minimum. All other parameters are specified at +25°C only. Standard
temperature range is 0°C to +70°C.
2. ET Product — All coils have an ET product of 10 V-µsec minimum.
3. Flammability — Materials used in the products are recognized
as UL94-VO approved. Products meet the requirements of IEC 695-2-2
(Needle Flame Test).
4. Balance Characteristics — The transformers meet the requirements for lon-
gitudinal balance of FCC part 68.
5. Common Mode Rejection Ratio — the CMRR for all transformers is better
than 50 dB at 1 MHz. A typical test circuit is shown below.
HP-8751A
P1 P2
50:100
BALUN
XFMR
100:50
BALUN
6. Crosstalk Attenuation — In the dual packages, which contain transmit and
receive transformers side by side, sufficient crosstalk attenuation is achieved
by the inherent characteristics of the toroid cores as well as by their proper
positioning. The crosstalk attenuation is typically50 dB or better from 100kHz
to 10MHz. This result was established with the test circuit shown below.
HP-8751A
P1 P2
50:100
BALUN
100
100
XFMR 100:50
BALUN
7. Return Loss — ITU-T G.703 and European national regulatory documents
specify minimum return loss levels. The transformers will allow these limits to
be complied within the situations where they are applicable.
Frequency
50-100kHz
100kHz-2 MHz
2-3MHz
Return Loss
XMIT
9 dB
15dB
11dB
REC
12 dB
18dB
14dB
8. Surge Voltage Capability – All transformers and chokes meet surge voltage
tests according to the most stringent regulatory documents when system
designs include the proper voltage and current suppression devices:
Metallic Voltage:
Longitudinal Voltage:
800V peak, 10/560µsec
2,400V peak, 10/700µsec
9. Isolation Voltage — 100% of transformers are tested during
production to the specified isolation voltage level.
10. Safety Agency Recognition — Parts listed as "Recognized" or "Certified"
meet Underwriter Laboratories, UL 1459 and UL 1950 per file E133523 (S).
Transformers with Reinforced Insulation according to IEC950 series
PE-68630—PE-68788 (pg. 3) are certified by the following organizations:
Code Certificate Information
T
TÜV, EN 60 950/EN 41003, Cert. R9371358, reinforced insulation.
U UL 1459/UL1950, File E133523 (S), reinforced insulation.
11. General Information — The transformers are specifically designed for use
in 1.544 Mbps (T1), 2.048 Mbps (CEPT) and ISDN Primary rate (PRI)
interface applications. They are matched to the majority of the line interface
transceiver ICs currently available. Use of the proper transformer allows the
interface circuit to comply with ITU-T G.703 and other standards regarding
pulse waveform, return loss, and balance.
12. Common Mode Chokes — The “high-frequency” 4-lines common mode
chokes shown in this data sheet provide an effective means of compliance with
national and international regulations on EMI. They are designed to be used in
conjunction with Pulse’s T1/CEPT transformers as shown in the typical
application below. Crosstalk is typically -70dB at 1MHz and -55dB at 10MHz.
Typical Application
Transformer
Transformer
IC
XMiT
IC
RCVE
RCVE
Choke
Choke
XMIT
NOTES FROM TABLES (pages 1 through 6):
Part
Turns Secondary Turns Secondary G. PE-68618 and PE-64950: The fault locate winding is (7-8).
Number Ratio 1 Pins Ratio 2 Pins
H. Safety Agency approvals pending.
A. Toleranced leakage inductance: .30µH min to .55µH MAX.
PE-65837 1:1.08 3-5 1:1.36 1 - 5
B. OCL (primary inductance) and LL (leakage inductance) are
measured at the primary winding. Turns ratio is specified
primary: secondary. (CT = Center Tap; CS = Split Center
Tap).
PE-65839
PE-65866
PE-68646
PE-65389
1:1
1:1
1:1.58
1:1
3-5
2-3
3-5
3-5
1:1.26
1:1.26
1:2
1:1.26
1-5
1-3
1-5
1-5
I. The turns ratio of these devices have been designed, in
conjunction with semiconductor vendor recommendations,
to allow connections to various terminations (e.g. 75 or
120Ω with the same transformer). For example T1075 can
be used with the Siemens PEB 2235 to achieve connection
C. To make a 1CT:1 ratio from a 1CT:2CT ratio, use only one PE-65566 1:1
2-3 1:1.26 1 - 3
to the 75 or 120Ω cable. For 75 Ω termination, the PEB
half of the secondary (2CT) winding.
PE-65568 1:1
2-3 1:1.26 1 - 3
2235 requires the following turns ratio: 1:1.57 (Tx) and
D. For Reinforced 3kVrms Dual SMT Transformers, refer to ^{PE-68866 1:1}
2-3 1:1.26 1 - 3
1:1.26 (Rx) which can be achieved using pins (1-2):(15-16)
data sheet T617. For Quad SMT Transformers refer to data ^{PE-68826 1:1}
2-3 1:1.26 1 - 3
for Tx and (10-11):(5-8) for Rx. For 120Ω, the following
sheet T615. For Octal SMT Transformers refer to data ^{PE-68664 1:1}
3-5 1:1.26 1 - 5
turns ratio are required: 1:2 (Tx) and 1:1 (Rx), which are
sheet T622.
PE-68836 1:1 2-3/5-6 1:1.26 1-3/4-6
E. Dual Ratio Transformers — These transformers have ^{F. Standard packaging for surface mount “AN” and “LA” pack-}
pins (1-2):(16-14) for Tx and (9-11):(5-8) for Rx on the
T1075.
tapped secondary windings to provide two turns ratios ^{ages is anti-static tubes. Optional Tape & Reel packaging}
(T/R). Use the entire primary winding and connect the sec- ^{can be ordered by adding “T” suffix to the part number,}
ondary pins listed below to obtain the desired turns ratio:
(i.e. PE-65857T).
USA 858 674 8100 • Germany 49 7032 7806 0 • Singapore 65 6287 8998 • Shanghai 86 21 32181071 • China 86 755 33966678 • Taiwan 886 3 4643715
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T608.S (4/08)