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| 型号： | 73M1906B-IVT/F |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 60/88页 |
| 文件大小： | 0K |
| 描述： | MICRODAA SET FXO OF VOIP 20TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 74 |
| 系列： | * |
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DS_1x66B_001
73M1866B/73M1966B Data Sheet
Rev. 1.6
63
9.6
Line-Side Device Operating Modes
The architecture of the 73M1x66B is unique in that the isolation barrier device, an inexpensive pulse
transformer, is used to provide power and also bidirectional data between the Host-Side Device and the
Line-Side Device. When the 73M1x66B is on hook, all the power for the Line-Side Device is provided
over the barrier interface. After the Line-Side Device goes off hook, the telco line supplies approximately
8 mA to the Line-Side Device while the host provides the remainder across the barrier. It is also possible
to power the Line-Side Device entirely from the line provided there is at least 17 mA of loop current
available. Setting the ENLPW bit enables this mode and turns off the power supplied across the barrier.
There is a penalty in using this mode in that the noise and dynamic range are about 6 dB worse than with
the Barrier Powered Mode. It is therefore recommended that the Line Powered Mode be reserved for
applications where the absolute minimum power from the host side is a priority and the reduction in
performance can be tolerated.
Figure 32 shows the AC and DC circuits of the Line-Side Device.
+
C4
10uF
Q7
MMBTA42
1
3
2
Q6
BCP-56
1
2
3
4
R65 200
U2
73M1916-20
OFH
4
VNX
5
SCP
6
MID
7
VPX
8
VBG
11
ACS
12
SRE
9
SRB
10
VNS
13
VPS
14
RXP
15
RXM
16
TXM
17
DCS
19
DCD
18
DCI
1
RGN
2
RGP
3
DCG
20
R3
412K, 1%
R12
5.1K
TP14
OFH
1
R11
5.1K
R58
240
R4
100K, 1%
Q3
MMBTA42
1
3
2
Q4
MMBTA92
1
3
2
Q5
MMBTA06
1
3
2
OHS
TXM
SRE
RXM
SRB
RXP
DCI
DCD
R5 8.2
-
+
BR1
HD04
4
1
3
2
Figure 32: Line-Side Device AC and DC Circuits
The DCIV bits control the voltage versus current characteristics of the 73M1x66B by monitoring the
voltage at the line divided down by the ratios of (R3+R4)/R4 (5:1) measured at the DCI pin. This voltage
does not include the voltage across the Q4 and the bridge. When both the ENAC and ENDC bits are set
(the hold mode), the DCIV characteristics follow approximately a 50
Ω load line offset by a factor
determined by the DCIV bits. If ENDC=1 and ENAC=0, the 73M1x66B will go into the ”Seize state mode”
and the DC voltage load characteristic will be reduced to meet the Australian seize voltage requirements
regardless of the setting of the DCIV bits.
9.7
Fail-Safe Operation of Line-Side Device
The 73M1x66B provides additional protection against improper operation during error and harmful
external events. These include power or communication failure with the Line-Side Device and the
detection of abnormal voltages and currents on the line. The basis of this protection is to ensure that
under these conditions the device is in the On-Hook state and the isolation is provided.
The following events will cause the 73M1x66 Line-Side Device to go to the On-Hook state if it is Off-Hook:
1.
A Power-On Reset occurs while Off-Hook.
2.
The non-transition timer function (see DISNTR) is triggered by the absence of any signal transitions
for more than 400 s on the barrier interface, indicating a problem with communications.
3.
The power supply to the Line-Side Device is below normal operating levels.
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相关代理商/技术参数 |
参数描述 |
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| 73M1906B-IVTR/F | 功能描述:电信线路管理 IC DAA-FXO VOLP System Host Side RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| 73M1906-IVT/F | 制造商:TERIDIAN 功能描述: |
| 73M1912-IM/F | 功能描述:电信线路管理 IC MicroDAA Chip Set Line Side RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| 73M1912-IMR/F | 功能描述:电信线路管理 IC MicroDAA Chip Set Line Side RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| 73M1912-IVT/F | 功能描述:电信线路管理 IC MicroDAA Chip Set Line Side RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
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