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AN1500A Datasheet(PDF) 10 Page - Sames

Part # AN1500A
Description  SINGLE CHIP TELEPHONE DEMO BOARD
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Manufacturer  SAMES [Sames]
Direct Link  http://www.sames.co.za
Logo SAMES - Sames

AN1500A Datasheet(HTML) 10 Page - Sames

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AN1500A
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11.1.2 Measurement:
Echo return loss (according to BAPT223
ZV5) is measured by bridge balance
measurement as shown in Fig.3:
R1 and R2 must be matched to 0.1%,
the
measuring
equipment
must
be
isolated from earth and should have an
input resistance of >25k
Ω.
Capacitors C1 and C2 must be >10µF.
The Telephone under test is supplied by
a (high ohmic) current source and
measurements are taken in speech
mode with a connected handset.
Fig. 3: Return loss measurement setup
Calculation of results:
The sending level, measured in “cal”-position of switch SW is tuned to ps=-10dB950mV= 300mVrms,thus the sinewave
generator’s level is -4dB950mV = 600mVrms.The receive level (=pe) is measured in “meas”-position of switch SW.
The echo return loss is then calculated by:
ardB = ps - pe
(ps, pe levels in dB950mV)
or
ardB = 20* log (ps / pe)
(ps, pe levels in mVrms)
Fig.4 shows some typical
results, measured with the
DB1500I demo board with
Zref= 600
Ω, Z
ref=
220
Ω +
820
Ω//115nF
and
Zref=
270
Ω + 750Ω//150nF.
The board was configured
as shown in the schematic,
using a single bipolar
(2SA1210) line transistor.
Fig. 4: typ. return loss measurement results with the DB1500I demo board
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0
300
600
900
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2700
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3600
3900
f [Hz]
600 Ohms
220+820//115nF
270+750//150nF
12 Sidetone cancellation


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