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| 型号： | SI3232PPTX-EVB |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 43/128页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL W/DISCRETE INTERFACE |
| 标准包装： | 1 |
| 系列： | ProSLIC® |
| 主要目的： | 接口，模拟前端（AFE） |
| 已用 IC / 零件： | Si3232 |
| 已供物品： | 板，CD |
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Si3232
Preliminary Rev. 0.96
21
Not
fo
r N
ew
esi
gn
s
Figure 7. DC Linefeed Overhead Voltages
(Forward State)
4.3.1. Calculating Overhead Voltages
The two programmable overhead voltages, VOV and
VCM, represent one portion of the total voltage between
operating conditions, these overhead voltages are
sufficiently low to maintain the desired TIP-RING
voltage, VOC. There are, however, certain conditions
under which the user must exercise care in providing a
battery supply with enough amplitude to supply the
required TIP-RING voltage as well as enough margin to
accommodate these overhead voltages. The VCM
voltage is programmed for a given operating condition.
Therefore,
the
open-circuit
voltage,
VOC, varies
according to the required overhead voltage, VOV, and
the supplied battery voltage, VBAT. The user should pay
special attention to the maximum VOV and VCM that
might be required for each operating state.
In the off-hook active state, sufficient VOC must be
maintained to correctly power the phone from the
battery supply that has been provided. Since the battery
supply depends on the state of the input supply (i.e.,
charging, discharging, or battery backup mode), the
user must decide how much loop current is required and
determine the maximum loop impedance that can be
driven based on the battery supply provided.
The minimum battery supply required can be calculated
according to the following equation.
The default VCM value of 3 V provides sufficient
overhead for a 3.1 dBm signal into a 600
loop
impedance.
A VOV value of 4 V provides sufficient headroom to
source a maximum ILOOP of 45 mA along with a
3.1 dBm audio signal and an ABIAS setting of 16 mA.
For a typical operating condition, VBAT = –56 V and
ILIM =22mA:
VOC,MAX =56V – (3V + 4V)=49V
These conditions apply when the dc-sensing inputs,
STIPDCa/b and SRINGDCa/b, are placed on the SLIC
side of any protection resistance placed in series with
the TIP and RING leads. If line-side sensing is desired,
both VOV and VCM must be increased by a voltage
equal to RPROT x ILIM where RPROT is the value of each
protection resistor. Other safety precautions may apply.
During Ringing" on page 40 for details on calculating the
overhead voltage during the ringing state.
The Si3232 uses both voltage and current information to
control TIP and RING. Sense resistor RDC (see
Figure 6) measures dc line voltages on TIP and RING;
capacitor CAC couples the ac line voltages on the TIP
and RING leads to be measured. The Si3232 uses the
Si3200 linefeed interface IC to drive TIP and RING and
to isolate the high-voltage line from the low-voltage
Si3232.
The Si3232 measures voltage at various nodes to
monitor the linefeed current. RDC and RBAT provide
these
measuring
points.
The
sense
circuitry
is
calibrated on-chip to ensure measurement accuracy.
See "4.4. Linefeed Calibration" on page 25 for details.
Constant I Region
Constant V Region
V
CM
V
OC
V
OV
V
OV
R
LOOP
V
BATH
V
TIP
V
RING
V
BATL
Secondary V
BAT
Selected
V
Loop Closure Threshold
V
BAT
V
OC
V
CM
V
OV
++
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI3232-X-FQ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DUAL PROGRAMMABLE CMOS SLIC WITH LINE MONITORING |
| SI3232-X-GQ | 制造商:SILABS 制造商全称:SILABS 功能描述:DUAL PROGRAMMABLE CMOS SLIC WITH LINE MONITORING |
| SI3233 | 制造商:SILABS 制造商全称:SILABS 功能描述:PROSLIC㈢ PROGRAMMABLE CMOS SLIC WITH RINGING/BATTERY VOLTAGE GENERATION |
| Si3233-C-FM | 功能描述:射频无线杂项 Single-Chan SLIC RoHS:否 制造商:Texas Instruments 工作频率:112 kHz to 205 kHz 电源电压-最大:3.6 V 电源电压-最小:3 V 电源电流:8 mA 最大功率耗散: 工作温度范围:- 40 C to + 110 C 封装 / 箱体:VQFN-48 封装:Reel |
| SI3233-C-FMR | 功能描述:电信线路管理 IC Single-CH SLIC only BJT/inductor dc-dc 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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