ETALDOC 78/19

Page 1 of 5

January 2001

PRODUCT DATA SHEET

LOW PROFILE LINE

P1165

MATCHING TRANSFORMER

Features

Applications

∗

  Low Profile (11mm)

∗

  Telecommunications

∗

  Vacuum encapsulated

∗

  Modems to V.34

∗

  IEC 950, UL 1950 and EN 60950 certified

∗

  Line matching

∗

  UL Recognized Component

∗

  Portable computers

∗

  BABT Certificate of Recognition

∗

  Fax/modems

∗

  CSA NRTL/C Certificate of Compliance

∗

  Instrumentation

∗

  High Thermal Stability

∗

  Voice

 
 

 

DESCRIPTION

P1165 is intended for data communications at
V.32bis (14,400 bits/second) data rates. With careful
circuit design, P1165 may be used for V.34
applications to 33,600 bits/second or higher.

P1165 is specifically designed to be easily matched
to both 600ohm and complex impedance telephone
lines, using a minimum of external components.

P1165 also exhibits stable characteristics over its
operating temperature range to  maximize data
throughput under varying environmental
conditions without the need for modem retraining.

P1165 is certified to IEC 950, EN 60950,
EN 41003 and UL1950. P1165 is a 

UL

Recognized Component and is supported by a
BABT Certificate of Recognition, a  CSA Certificate
of Compliance and an IEC CB Test Certificate.

 

E203175

to Electronic Techniques

(Anglia) Limited

P1165

ETALDOC 78/19

Page 2 of 5

January 2001

SPECIFICATIONS

Electrical

At T = 25ºC and as circuit fig. 2 unless otherwise stated.

Parameter

Conditions

Min

Typ

Max

Units

Insertion Loss

f = 2kHz, R

L

 = 560

Ω

-

-

1.5

dB

Frequency response

LF-3dB cutoff
HF-3dB cutoff
200Hz - 4kHz

-
-
-

30
15

-

-
-

±0.2

Hz

kHz

dB

Return Loss

200Hz - 4kHz

18

-

-

dB

Distortion 

(1)

0dBm in line, 3

rd

 Harmonic

f = 600Hz
f = 450Hz

-
-

-76
-75

-72
-70

dBm
dBm

Balance

DC – 5kHz
Method TG25

80

-

-

dB

Saturation

Excitation 50Hz
250V rms.
Output voltage
across line

-
-

-
-

10
65

V rms

V peak

Voltage
isolation 

(2)

50Hz
DC

3.88

5.5

-
-

-
-

kVrms

kV

Operating range:
Functional
Storage
Humidity

Ambient temperature

-10

–40

-

-
-
-

+70

+125

95

ºC
ºC

%R.H.

Lumped equivalent circuit parameters as Fig. 1

DC resistance, R

DC

 

(3)

Sum of windings

108

-

132

Ω

Leakage inductance 

∆

L

6.5

-

7.5

mH

Shunt inductance Lp 

(4)

-22dBm 200Hz
–22dBm 1kHz

2.25

-

4

2.5

10

-

H
H

Shunt loss Rp 

(4)

-43dBm 200Hz
-43dBm 1kHz

8

12

-
-

-
-

k

Ω

k

Ω

 

Notes

1.  Third harmonic typically exceeds other

harmonics by 20dB.

2.  Components are 100% tested at 6.5kV DC.
3.  Caution:  do not pass DC through windings.

Telephone line current, etc. must be diverted
using choke or semiconductor  line hold
circuit.

4.  At signal levels greater than –20dBm, Lp will

increase and  Rp will decrease slightly but the
effect is usually favourable to the return loss
characteristic.

Equivalent Circuit

Fig. 1

IDEAL

1:1

LINE

EQUIPMENT

½   L

½   L

½ R

½ R

P1165

ETALDOC 78/19

Page 3 of 5

January 2001

PERFORMANCE CHARACTERISTICS

EUROPEAN CTR21 COMPLEX MATCH

Recommended Circuit

Fig 5

100

LINE

270

750

910

27nF

100nF

150nF

µ

2.2 F

Recommended Circuit

Fig 2

LINE

600

*If return loss >16dB, 300Hz - 4kHz is acceptable, blocking

capacitor may be relaxed to

µ

6.8 F

+50

20 %*

6.8 F

+50

20

_

_

%

600    MATCH

Ω

18nF  5%

680  10%

560  2%

Recommended Circuit

Fig 6

910

LINE

270

750

330

82nF

150nF

µ

2.2 F

0

-0.2

-0.3

-0.4

100Hz

200 300

500

1kHz

2

Frequency

dB

3

4 5

10

-0.1

Ty

p ic

al

Wo

rst

  C

a s

e

Frequency Response

Fig 3

Figure 5 gives flat RX and TX responses against the 
reference impedance (typically around  0.5dB 
200Hz - 4kHz).  Return loss is typically better than 
20dB.   The 150nF capacitor should be of a 
temperature stable dielectric.   In practice, the 
100ohm resistor will normally connect to a low 
impedance TX output.

For circuits with existing board drillings, figure 6 
gives good return loss (>20dB) against the reference 
impedance, but TX and RX flatness are degraded by 
the use of this topology.

For recommended matching to other reference 
impedances please contact ETAL.

+

_

-14

-22

-26

-30

100Hz

200 300

500

Typical

Worst Case

1kHz

2

Frequency

dB

3

4 5

10

-18

Return Loss

Fig 4

Typical

Fundamental

450Hz

-74

-72

-76

-78

-80

-10

-5

Fundamental Power (dBm)

Th

ir

d

 

H

a

rm

o

n

ic

 

d

Bc

0

+5

Third Harmonic Distortion vs. Signal Level

Fig 7

500+600Hz

Typical

1.6kHz+2.0kHz

Total power in line (dBm)

D

is

to

rt

io

n

 

Po

w

e

r 

in

2

0

0

H

z 

- 

4

kH

z 

b

a

n

d

w

id

th

2 Tone Intermodulation Products

vs. Signal Level

Fig 8

-70

-60

-80

-90

-10

-8

-6

-4

dBm

-2

0

P1165

ETALDOC 78/19

Page 4 of 5

January 2001

CONSTRUCTION

Dimensions shown are in millimetres (inches).
Geometric centres of outline and pin grid coincide within a tolerance circle of 0.6mm
Windings may be used interchangeably as primary or secondary.

SAFETY

CERTIFICATION

Constructed in accordance with IEC 950:1991,
EN60950:1992 (BS7002:1992) to amendment 5,
supplementary insulation, and UL 1950 3rd Edition,
reinforced insulation, 250Vrms  maximum working
voltage, flammability class V-0.
Distances through solid insulation 0.4mm
minimum.

Certified under the IEC CB scheme (Certificate
GB443W) to IEC 950:1991, up to amendment 4, sub-
clauses 2.2.2, 2.9.1, 2.9.6, 2.9.7, 4.4.3 (class V-0) and
5.3 for a maximum working voltage of 250Vrms,
nominal mains supply voltage not exceeding 300Vrms
and a maximum operating temperature of 70ºC in
Pollution Degree 2 environments, supplementary
insulation.
Recognized under the Component Recognition
Program of Underwriters Laboratories Inc. to US and
Canadian requirements CAN/CSA C22.2
No. 950-95/UL1950, Third Edition, including revisions
through to revision date March 1, 1998, based on
Fourth Amendment of IEC 950, Second Edition,
maximum working voltage 250Vrms, Pollution Degree
2, reinforced insulation.

UL File number E203175.
CSA Certificate of Compliance 1107696 (Master
Contract 188107).
Approved and certified by BABT to EN 60950 and
EN 41003.
BABT Certificate of Recognition CR/0137.

Additionally, Profec Technologies certifies all
transformers as providing voltage isolation of
3.88kVrms, 5.5kV DC minimum.   All shipments are
supported by a Certificate of Conformity to current
applicable safety standards.

P1165

ETALDOC 78/19

Page 5 of 5

January 2001

ABSOLUTE MAXIMUM RATINGS

COPYRIGHT

(Ratings of components independent of circuit).

Short term isolation voltage (2s)

DC current

Storage temperature

Lead temperature, 10s

4.6kVrms,
6.5kV DC

100

µ

A

-40º C to
+125ºC

260º C

ETAL, and P1165 are Trade Marks of Profec
Technologies Ltd.
The  Trade Mark ETAL is registered at the UK
Trade Marks Registry.

Profec Technologies Ltd. is the owner of the
design right under the Copyright Designs and
Patents Act 1988 and no rights or licences are
hereby granted or implied to any third party.

© 1997 - 2000 Profec Technologies Ltd.
Reproduction prohibited.

T R A N S F O R M I N G    T H E         F U T U R E

Profec Technologies Ltd., 10 Betts Avenue, Martlesham Heath, Ipswich, IP5 3RH, England

                           Telephone: +44 (0) 1473 611422

Fax:  +44 (0) 1473 611919

Websites: www.etal.ltd.uk

www.profec.com

Email:

info@etal.ltd.uk

sales@profec.com

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