Intelligent Subscriber Line Interface Circuit
Intelligent Accessä Voice Solutions
Am79231
Intelligent Subscriber Line Interface Circuit (ISLIC™)
DISTINCTIVE CHARACTE...
Description
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
+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
BLOCK DIAGRAM
AD SA HPA HPB SB BD Attenuator VSAB Two-Wire Interface Longitudinal Control Gain/Level Shift Signal Transmission RSN VTX
VLB
VREF Signal Conditioning IMT ILG CREF
TMN TMP TMS
Thermal Management Control Fault Meas.
VBL Switch Driver VBH R2 R3 RYE Relay Drivers
Relay Control
P1 Input Decoder and Control Registers P2 P3 LD
R1
Relay Driver 1
BGND
GND
VCC
Pub. # 080248 Rev: C Amendment: /0 Issue Date: December 1999
TABLE OF CONTENTS
Distinctive Characteristics . . . . . . . . . . . . . . . . . . . . . . ...
Similar Datasheet