le79232 Zarlink Semiconductor, le79232 Datasheet

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le79232

Manufacturer Part Number
le79232
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 10ZS231
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
Separate test-in and test-out busses allow simultaneous
test-in and test-out access.
The voltage sense is connected before the test-out relay,
such that the impedance generation is preserved during
test-in access or during self-test performed with the loop
disconnected
The test-out relay can be used to disconnect the loop
during test-in access, in-service calibration, self-test, or to
measure sensing offsets
The LCAS is inside the impedance feedback loop and
doesn't degrade the longitudinal balance
In-service calibration can be performed using a central
circuit connected to the test-in bus
Self-test is performed using the calibration circuit or using
a single test load resistor located on the test-in bus
Voltage range at the tip and ring port is ±200 V with typical
secondary protection
The LCAS break switches are used such that the SLIC
leakage doesn't affect the results
Measurement offsets can be calibrated by using the test-
out relay to disconnect the loop, or by applying a low
impedance to ground on the test-in bus
Current range is ±60 mA total common-mode current
and ±80 mA differential and common mode current per
individual lead
Le79232 SLIC
Le79232 SLIC and External Ringing with Le75282 LCAS, Test-In Bus and Test-Out Bus
Device
RD1
VBH
AD
SA
BD
SB
P1
P2
P3
SLAC I/O
Test-Out Relay
PRODUCT
CFG
OFF
P3
P2
P1
Le75282 LCAS
VOICE CONTROL PROCESSOR
Test-In Bus
Test-In Bus
3-Element Resistance Testing
Fuse Test
Loop Resistance Test
Voltage range at the tip and ring port is VBH to ground,
minus the saturation voltage at peak common-mode
current
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 ground,
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
Generator
Ring
EMR
EMR
Test-Out Bus
Test-Out Bus
Secondary
Protection
PREVIEW
Fuse
Fuse
w w w . Z A R L I N K . c o m
RING
TIP
LE79232

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