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PDF AM79D2251 Data sheet ( Hoja de datos )
| Número de pieza | AM79D2251 | |
| Descripción | Dual Intelligent Subscriber Line Audio-Processing Circuit | |
| Fabricantes | Advanced Micro Devices | |
| Logotipo |  |
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Intelligent Access™ Voice Solutions
www.DataSheet4U.com
Am79D2251
Dual Intelligent Subscriber Line Audio-Processing Circuit (ISLAC)
DISTINCTIVE CHARACTERISTICS
s High performance digital signal processor
provides programmable control of all major
linecard functions
— 32 and 24 kb/s ADPCM to G726, as well as
A-law/µ-law and linear codec
— Transmit and receive gain
— Two-wire AC impedance
— Transhybrid balance
— Equalization
— DC loop feeding
— Smooth or abrupt polarity reversal
— Loop supervision
— Off-hook debounce circuit
— Ground-key and ring-trip filters
— Ringing generation and control
— Adaptive hybrid balance
— Line and circuit testing
BLOCK DIAGRAM
A1
ISLIC
B1
RC
Networks
and
Protection
A2
ISLIC
B2
Ring-Trip
5 Sense
Resistors
— Tone generation
— Metering generation at 12 kHz and 16 kHz
— Envelope shaping and level control
s Selectable PCM/MPI or GCI digital interfaces
— Supports most available master clock
frequencies from 512 kHz to 8.196 MHz
s 0 to 70°C commercial operation
— –40°C to 85°C extended temperature range
available
s +3.3 V DC operation
s Exceeds LSSGR and ITU requirements
s Supports external ringing with on-chip ring-trip
circuit
— Automatic or manual ring-trip modes
s DTMF detection according to Q.24
s 2100 Hz modem tone detection according to V.25
7
LD1
VREF
AGND1
AGND2
3 P1-P3
7
LD2
RREF
5
BATH
BATL
BATP
RSHB
RSLB
RSPB
Dual
ISLAC
4 VCCA
VCCD
DGND1
DGND2
TSCA/G
DRA/DD
DXA/DU
DCLK/S0
PCLK/FS
MCLK
FS/DCL
CS/RST
DIO/S1
INT
Pub. # 22829 Rev: C Amendment: /0
Issue Date: December 1999
1 page  
ORDERING INFORMATION
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AMD standard products are available in several packages and operating ranges. The ordering
number (valid combination) is formed by a combination of the elements below. Two ISLIC devices
need to be used with this part.
Am79D2251 J
C
Valid Combinations
Am79D2251
JC
Am79D2251
VC
TEMPERATURE RANGE
C= Commercial (0°C to +70°C)
PACKAGE TYPE
J = 44-pin plastic leaded chip carrier (PL044)
V = 44-pin thin plastic quad flat pack (PQT044)
DEVICE NAME/DESCRIPTION
Am79D2251
Advanced Dual Intelligent Subscriber Line Audio-
Processing Circuit
Valid Combinations
Valid combinations list configurations planned to
be supported in volume for this device. Consult
the local AMD sales office to confirm availability
of specific valid combinations, and to check on
newly released valid combinations.
Am79D2251
5
5 Page 
www.DataSheet4U.com
RSAi
A RFAi
Figure 4. Internal Ringing Linecard Schematic
+5 V
3.3 V
VCC CREF
SA RSN
RRXi
RHLai
VOUTi
DGND
AD
CHLbi
RHLbi
RTESTMi
U3 D1
BATH
DT1i
CS
U4
D2
CADi
CHPi
HPA
HPB
VSAB
RHLci RHLdi
CHLdi
RTi VREF
VHLi
AGND
VCCA
VSABi VCCD
VTX VINi
VCC
+3.3VDC
B RFBi
RSBi
DT2i***
CSSi
CBDi
RMGPi
RMGLi
BD
VLB
SB IMT
TMS U1
Am79R241
TMP
TMN
ILG
RMTi
VREF
RLGi
VREF
VLBi
VIMTi
U2
ISLAC
VILGi
BACK
PLANE
DHi
BATH
DLi
BATL
CBATHi CBATLi
RTESTLi
* CSS required for > 2.2 Vrms metering
** Connections shown for one channel
*** DT2i diode is optional - should be
connected if there is a chance that this chip
may be replaced by Am79R251.
VBH
VREF
VBL
RSVD
RYE
LD
GND
P1
P2
P3
R2
R3
R1
BGND
RSVD
VREF
LDi SPB
P1 SLB
BATL
RSLB
P2
P3 SHB
BATH
RSHB
IREF
RREF
Am79D2251
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AM79D2251.PDF ] | |
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