AM79D2251JC AMD [Advanced Micro Devices], AM79D2251JC Datasheet
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AM79D2251JC
Manufacturer Part Number
AM79D2251JC
Description
Dual Intelligent Subscriber Line Audio-Processing Circuit (ISLAC)
Manufacturer
AMD [Advanced Micro Devices]
Datasheet
1.AM79D2251JC.pdf
(35 pages)
Am79D2251
Dual Intelligent Subscriber Line Audio-Processing Circuit (ISLAC )
DISTINCTIVE CHARACTERISTICS
BLOCK DIAGRAM
High performance digital signal processor
provides programmable control of all major
linecard functions
— 32 and 24 kb/s ADPCM to G726, as well as
— DC loop feeding
— Loop supervision
— Ringing generation and control
— Adaptive hybrid balance
— Line and circuit testing
A-law/ -law and linear codec
— Transmit and receive gain
— Two-wire AC impedance
— Transhybrid balance
— Equalization
— Smooth or abrupt polarity reversal
— Off-hook debounce circuit
— Ground-key and ring-trip filters
A1
B1
A2
B2
Protection
Networks
and
RC
Intelligent Access
5
ISLIC
ISLIC
Ring-Trip
Resistors
Sense
™
BATH
BATL
BATP
Voice Solutions
5
— Tone generation
— Metering generation at 12 kHz and 16 kHz
Selectable PCM/MPI or GCI digital interfaces
— Supports most available master clock
0 to 70°C commercial operation
— –40°C to 85°C extended temperature range
+3.3 V DC operation
Exceeds LSSGR and ITU requirements
Supports external ringing with on-chip ring-trip
circuit
— Automatic or manual ring-trip modes
DTMF detection according to Q.24
2100 Hz modem tone detection according to V.25
— Envelope shaping and level control
frequencies from 512 kHz to 8.196 MHz
available
7
7
3
RSPB
RREF
RSHB
RSLB
AGND1
AGND2
P1-P3
VREF
LD1
LD2
Pub. # 22829
Issue Date: December 1999
ISLAC
Dual
Rev: C
4
Amendment: /0
VCCA
VCCD
DGND1
DGND2
DRA/DD
DXA/DU
DCLK/S0
PCLK/FS
MCLK
FS/DCL
CS/RST
DIO/S1
INT
TSCA/G