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PDF AM79212 Data sheet ( Hoja de datos )
| Número de pieza | AM79212 | |
| Descripción | (AM79C202 / AM79212) PCM CODEC | |
| Fabricantes | Legerity | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AM79212 (archivo pdf) en la parte inferior de esta página. Total 36 Páginas | ||
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Am79212/Am79C202
Advanced Subscriber Line Interface Circuit
(ASLIC™) Device
Advanced Subscriber Line Audio-Processing Circuit
(ASLAC™) Device
DISTINCTIVE CHARACTERISTICS
Performs all of the functions of a CODEC-Filter
Single channel architecture
Performs Battery-Feed, Ring-trip, Signaling,
Coding, Hybrid, and Test (BORSCHT) functions
Single hardware design meets multiple country
requirements through software programming
GCI Interface
— Control and PCM on one bus
— Data rate up to 4.096 MHz
Monitor of two-wire interface voltage and current
for subscriber line diagnostics
Low idle power per line
On-hook transmission
Only Battery and +5 V supplies needed
Exceeds LSSGR and CCITT central office
requirements
Off-hook and ground-key detectors with
programmable thresholds
Programmable line feed characteristics
independent of battery voltage
Built-in voice path test modes
Analog and digital hybrid balance capability
Adaptive hybrid balance capability
Linear power feed with power management and
thermal shutdown features
Abrupt and smooth polarity reversal
Power cross detection in ringing and non-
ringing states
Software programmable
— DC loop feed characteristics and current limit
— Loop supervision detection thresholds
— Off-hook detect debounce interval
— Two-wire AC impedance
— Transhybrid balance
— Transmit and receive gains
— Equalization
— Digital I/O pins
— A-law/µ-law selection
Compatible with inexpensive protection
networks. Accommodates low-tolerance fuse
resistors while maintaining longitudinal balance
to Bellcore specifications.
Power/Service Denial state
Small physical size
Integrated ring-trip function
Four relay drivers with built-in energy absorption
zener diodes
Synchronized ring relay operation: zero volts AC
on, zero current off
Software-enabled normal or automatic Ring-Trip
state
On-chip 12/16 kHz metering generation with on-
and off-meter pulse shaping
Supports loop-start and ground-start signaling.
0°C to 70°C commercial operation guaranteed by
production testing
–40°C to +85°C temperature range operation
available
Publication# 080165 Rev: C Amendment: /0
Issue Date: October 1999
1 page  
ASLAC Device
Legerity standard products are available in several packages and operating ranges. The order number (Valid Com-
bination) is formed by a combination of the elements below.
Must order Am79212 with the part below.
Am79C202
JC
TEMPERATURE RANGE
C = Commercial (0°C to 70°C)*
PACKAGE TYPE
J = 32-pin Plastic Leaded Chip Carrier (PL032)
Valid Combinations
Am79C202
JC
DEVICE NUMBER/DESCRIPTION
Am79C202
Advanced Subscriber Line Interface Circuit
Valid Combinations
Valid Combinations list configurations planned to
be supported in volume for this device. Consult
the local Legerity sales office to confirm availabil-
ity of specific valid combinations and to check on
newly released combinations.
Note:
* Functionality of the device from 0°C to +70°C is guaranteed by production testing. Performance from –40°C to +85°C is
guaranteed by characterization and periodic sampling of production units.
ASLIC/ASLAC Products
5
5 Page 
The PCM data can be either 8-bit companded A-law or
µ-law code. Voice and control data are read or written
to the digital interface in channels that are pin strap com-
patible.
Besides the CODEC functions, the ASLAC device pro-
vides all the sensing, feedback, and clocking neces-
sary to completely control ASLIC device functions with
programmable parameters. System-level parameters
under programmable control include active and disable
loop-current limits, feed resistance, and apparent bat-
tery-feed voltage. The longitudinal operating point is
programmable to optimize the ASLIC device signal
swing capability.
The ASLAC device provides signals at 12 or 16 kHz for
metering functions. The frequency and level of these
signals are programmable.
The ASLAC device provides extensive loop supervision
capability, including off-hook, ring-trip, and ground-key
detection. Detection thresholds for these functions are
programmable. A programmable debounce timer is
available that eliminates false detection due to contact
bounce. For subscriber line diagnostics, AC and DC line
conditions can be monitored using special test modes.
Results are sent upstream over the control interface.
ASLIC/ASLAC Products
11
11 Page | ||
| Páginas | Total 36 Páginas | |
| PDF Descargar | [ Datasheet AM79212.PDF ] | |
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