le79252 Zarlink Semiconductor, le79252 Datasheet

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le79252

Manufacturer Part Number
le79252
Description
Voice Control Processor
Manufacturer
Zarlink Semiconductor
Datasheet

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The products, their specifications, services and other information appearing in this publication are subject to change by Zarlink without notice.
© 2010, Zarlink Semiconductor Inc. All Rights Reserved. Publication Number 10ZS232
Information relating to products and services furnished herein by Zarlink Semiconductor Inc. or its subsidiaries is believed to be reliable.
ZARLINK, ZL, and the Zarlink logo are trademarks of Zarlink Semiconductor Inc.
Features
Foreign Voltage Testing
Foreign Current Testing
The voltage sense is connected before the test-out relay
such that, the impedance generation is present during self-
test performed with the loop disconnected
The test-out relay is used to disconnect the loop during
self-testing, calibration, or to measure sensing offsets
The PTCs are inside the impedance feedback loop and
don't degrade the longitudinal balance
The test load resistor is used for self-testing and to perform
limited calibration
Voltage range at the tip and ring port is normally VBH to
VBP but extends to ±400 V when the PTCs are activated
Measurement offsets can be calibrated by using the test-
out relay to disconnect the loop
Current range is ±60 mA total common-mode current
and ±80 mA differential and common mode current per
individual lead
Voltage range at the tip and ring port is VBH to VBP, minus
the saturation voltage at peak common-mode current
Le79252 SLIC
Device
RD1
VBP
VBH
TLD
SA
AD
BD
SB
Test-Out Relay
Secondary
Protection
PRODUCT
VOICE CONTROL PROCESSOR
Le79252 SLIC with Internal Ringing
Resistor
PTC or
Resistor
PTC or
3-Element Resistance Testing
Fuse Test
Loop Resistance Test
The current sensing offset can be calibrated out by
operating the test-out relay
Current range is ±60 mA total common-mode current
and ±80 mA differential and common mode current per
individual lead
Voltage range at the tip and ring port is VBH to VBP, minus
the saturation voltage at peak common-mode current
The fixed part of the current sensing offset is cancelled in
the test procedure by the two point measurement
The variable part of the current sensing offset can be
calibrated out by operating the test-out relay
The fuse test can be done by executing a 3-element
capacitance test in high gain mode with and without the
test-out relay activated
The voltage sensing offset and the feed current offset are
cancelled out by doing a positive and negative polarity
measurement at each current level
EMR
EMR
PREVIEW
Disconnect Relay
Disconnect Relay
Fuse (optional)
Fuse (optional)
w w w . Z A R L I N K . c o m
Test-Out Bus (optional)
Test-Out Bus (optional)
LE79252
RING
TIP

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