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PDF AM79231 Data sheet ( Hoja de datos )
| Número de pieza | AM79231 | |
| Descripción | Intelligent Subscriber Line Interface Circuit | |
| Fabricantes | Legerity | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AM79231 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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Intelligent Accessä Voice Solutions
Am79231
Intelligent Subscriber Line Interface Circuit (ISLIC™)
DISTINCTIVE CHARACTERISTICS
Monitor of two-wire interface voltages and
currents supports
— Voice transmission
— Programmable DC feed characteristics
— Independent of battery
— Current limited
— Selectable off-hook and ground-key thresholds
— Subscriber line diagnostics
— Leakage resistance
— Loop resistance
— Line capacitance
— Bell capacitance
— Foreign voltage sensing
— Power cross and fault detection
BLOCK DIAGRAM
+5 V and battery supplies
Dual battery operation for system power saving
— Automatic battery switching
— Intelligent thermal management
Compatible with inexpensive protection
networks
— Accommodates low tolerance fuse resistors or
PTC thermistors
Metering capable
— 12 kHz and 16 kHz
— Smooth polarity reversal
Tip-open state supports ground start signaling
Ring relay driver for external ringing
Integrated test load switches/relay drivers
AD
SA
HPA
HPB
SB
BD
Two-Wire
Interface
Longitudinal
Control
TMN
TMP
TMS
VBL
VBH
R2
R3
RYE
R1
Thermal
Management
Control
Fault
Meas.
Switch
Driver
Relay
Drivers
Relay Control
Input Decoder and
Control Registers
Relay
Driver 1
Signal
Transmission
Gain/Level Shift
Attenuator
Signal
Conditioning
RSN
VTX
VLB
VSAB
VREF
IMT
ILG
CREF
P1
P2
P3
LD
BGND
GND
VCC
Pub. # 080248 Rev: C Amendment: /0
Issue Date: December 1999
1 page  
Figure 2. Am79231 Block Diagram
AD
IA
SA
HPA
Fault
Meas.
IA sense
IA
600
A Amplifier
+
-
+
-
+
RSN
VTX
TMS
HPB
BGND
Fault
Meas.
SB
IB
BD
IB sense
IB
600
TMN Thermal
Management
TMP Control
VBH
VBL
R3
High Neg.
Bat. sel.
VREF
+
-
B Amplifier
To Power
Amplifiers
-
+
+
β = 0.01
-
VREF
VSAB
VREF
VREF
Gain/Level Shift
VLB
IA
600
+
IB
600
IA
600
−
IB
600
Thermal
Shutdown
IMT
ILG
RYE
Decoder
R2
RD1 RD2 RD3 C1 C2 C3
Control Register
R1 Demux
Power amplifiers positive supply
BGND
P1 P2 P3
CREF
LD
VCC
GND
Am79231 Data Sheet
5
5 Page 
INTELLIGENT ACCESS™ VOICE CHIPSETS LINECARD WITH AM79231
Figure 3. External Ringing Linecard Schematic
+5 V
3.3 V
RSAi
A RFAi
18
VCC
SA
AD
CREF
RSN
RRXi
RHLai
CHLbi
RHLbi
VOUTi
DGND
KRi(A)
6
7
U5
CADi
RHLci RHLdi
CHLdi
RTi VREF
VHLi
AGND
VCCA
VSAB
2 CHPi HPA VTX
VSABi
VINi
VCCD
VCC
+3.3 VDC
BATH
CS
HPB
CSSi
B RFBi
4
5
CBDi
BD
VLB
IMT
VLBi
VIMTi
KRi (B)
RSBi
RTEST
DT2i***
RMGPi
SB
TMS
U1
Am79231
RMTi
VREF
ILG
TMP
TMN
RLGi
VREF
VREF
VILGi
U2
ISLAC
VREF
BACK
PLANE
RMGLi
RGFDLi
Ring Bus
BATH
BATL
DHi
DLi
VBH
VBL
CBATHi CBATLi
LD
GND
P1
P2
P3
LDi
P1
P2
P3
KRi
+5 V
RSVD2
RYE
R2H
R3H
R1
BGND
RSVD
* CSS required for > 2.2 Vrms metering
** Connections shown for one channel
*** DT2i is optional - Should be put if there is a chance that this
chip may be replaced by Am79R251.
RSRBi
XSBi
SPB
SLB
SHB
RSLB
RSHB
BATL
BATH
IREF
RREF
XSC
RSRC
Am79231 Data Sheet
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet AM79231.PDF ] | |
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