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參數(shù)資料
| 型號： | AM79M535 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | Metering Subscriber Line Interface Circuit |
| 中文描述： | 計(jì)量用戶線接口電路 |
| 文件頁數(shù)： | 1/18頁 |
| 文件大小： | 172K |
| 代理商： | AM79M535 |
Publication#
16856
Rev:
E
Issue Date:
October 1999
Amendment: /
0
Am79M535
Metering Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
I
Programmable constant-current feed
I
Line-feed characteristics independent of
battery variations
I
Programmable loop-detect threshold
I
On-chip switching regulator for low-power
dissipation
I
Pin for external ground-key noise filter
capacitor available
I
Ground-key detect
I
Two-wire impedance set by single external
impedance
I
Performs polarity reversal
I
Tip Open state for ground-start lines
I
Supports 2.2 Vrms metering (12 and 16 kHz)
I
On-hook transmission
BLOCK DIAGRAM
C1
C2
C3
E1
E0
Ring Relay Driver
RINGOUT
Off-Hook Detector
Signal Transmission
Ground-Key
Detector
GKFIL
VTX
RSN
Power-Feed
Controller
Ring-Trip Detector
Switching Regulator
Two-Wire
Interface
RD
RDC
A(TIP)
HPA
HPB
B(RING)
DA
DB
L
DET
Input Decoder
and Control
VREG
VBAT
BGND
16856B-001
CHS
CHCLK
AGND
QBAT
VEE
VCC
Notes:
1. Am79M535—E0 and E1 inputs; ring relay driver sourced internally to BGND; ground-key filter pin.
2. Current gain (K
1
) = 1000.
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