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參數資料
| 型號： | AM79R79JC |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | Ringing Subscriber Line Interface Circuit |
| 中文描述： | 振鈴用戶線接口電路 |
| 文件頁數： | 1/20頁 |
| 文件大小： | 361K |
| 代理商： | AM79R79JC |
Publication#
19752
Rev
: G
Amendment:
/0
Issue Date:
October 1999
Am79R79
Ringing Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
I
Ideal for short-loop applications
I
Ideal for ISDN terminal adaptor and fixed radio
access applications
I
On-chip ringing with on-chip ring-trip detector
I
Low standby state power
I
Battery operation:
— V
BAT1
: –40.5 V to –75 V
— V
BAT2
: –19 V to V
BAT1
I
On-chip battery switching and feed selection
I
On-hook transmission
I
Two-wire impedance set by single external
impedance
I
Programmable constant-current feed
I
Programmable Open Circuit voltage
I
Programmable loop-detect threshold
I
Current gain = 1000
I
Ground-key detector
I
Tip Open state for ground-start lines
I
Polarity reversal option available
I
Internal V
EE
regulator (no external –5 V power
supply required)
I
Two on-chip relay drivers and snubber circuits
(32 PLCC)
BLOCK DIAGRAM
E1
DET
D2
C1
C2
C3
D1
Two-Wire
Interface
HPA
HPB
Input Decoder
and Control
Relay
Driver
Ring-Trip
Detector
Power-Feed
Controller
RTRIP1
RTRIP2
BGND
VCC VNEG
RD
VTX
RDC
RDCR
AGND/DGND
VBAT2
A(TIP)
B(RING)
RYOUT1
Switch
Driver
VBAT1
RSGL
RSGH
B2EN
Ground-Key
Detector
Off-Hook
Detector
Relay
Driver
RYOUT2
RSN
Signal
Transmission
RINGIN
RYE
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