- 您现在的位置：买卖IC网 > Sheet目录1219 > HC5514XEVAL3 (Intersil)EVAL BOARD TI CODEC MOTHER BOARD
Application Note 9871
6. Connect a sine wave generator, referenced to ground, to
the VRX input.
7. Set the generator for 1V RMS at 1kHz.
8. Connect an AC voltmeter across tip and ring.
Veri?cation
1. Tip to ring AC voltage of 1V RMS when terminated with a
600 ? load. The dB (A 4-2 ) gain is approximately 0dB.
2. Tip to ring AC voltage of 2V RMS when not terminated. The
dB (A 4-2 ) gain is approximately 6dB.
3. Con?gure the SLIC to be in the Reverse Active state
(C3 = 1, C2 = 1, C1 = 0) and repeat above test.
Setup (2-Wire to 4-Wire Gain)
1. Connect the power supplies to the Evaluation board.
2. Set V BH to -48V, V BL to -24V and V CC to +5V.
3. Con?gure the SLIC to be in the Forward Active State
(C3 = 0, C2 = 1, C1 = 0).
4. Verify that the POL/REV pin (lower right hand side of the
board) is in either the 10ms or 20ms position.
5. Terminate tip and ring with a 600 ? load.
6. Verify that pin 2 of the PTG jumper (S8, located towards
the middle of board near the upper right hand corner of
the SLIC) is ?oating. This condition ?oats the PTG pin.
Reference section titled “Layout Considerations” for more
information about the PTG pin.
7. Connect a sine wave generator, referenced to ground, to
the VRX input.
8. Set the generator for 1V RMS at 1kHz.
Capacitor C4 performs three different functions, ring trip
?ltering, polarity reversal time and line voltage
measurement. C4 and R7/R10 set the timing for the polarity
reversal time. It is recommended that programming of the
reversal time be accomplished by changing the value of
R7/R10 (see Figure 7).
Setup
1. Connect the power supplies to the Evaluation board.
2. Set V BH to -48V, V BL to -24V and V CC to +5V.
3. Con?gure the SLIC to be in the Forward Active State
(C3 = 0, C2 = 1, C1 = 0).
4. Remove Generator.
5. Verify that the POL/REV pin S4 (lower right hand side of
the board) is in either the 10ms or 20ms position.
6. Terminate tip and ring with a 600 ? load.
7. Select either 10 μ s or 20 μ s polarity reversal time via the
POL / REV switch at the bottom right hand side of the
board.
8. Monitor the tip and ring voltage levels with a dual channel
storage scope. Toggle the SLIC between the Forward
Active state and the Reverse Active states to trigger the
scope.
9. Measure the time of reversal. Compare results to that
listed in Table 3.
10. Switch the POL / REV (S4) switch to the other reversal
time and compare results to that listed in Table 3.
TABLE 3. POLARITY REVERSAL TIME
9. Connect an AC voltmeter, referenced to ground, to the
POLARITY
FORWARD
VTX output.
Veri?cation
1. VTX voltage of 1V RMS when pin 2 of the PTG jumper is
?oating. The dB (A 2-4 ) gain is approximately -0.9dB.
REVERSAL SWITCH
SETTING
10 μ s
20 μ s
ACTIVE
TO REVERSE
≈ 10 μ s
≈ 20 μ s
REVERSE ACTIVE
TO FORWARD
≈ 10 μ s
≈ 20 μ s
2. VTX voltage of 0.5V RMS when pin 2 of the PTG jumper is
shorted to pin 1, via the supplied jumper. This condition
grounds the PTG pin. The dB (A 2-4 ) gain is approximately
-5.0dB.
3. Con?gure the SLIC to be in the Reverse Active state
(C3 = 1, C2 = 1, C1 = 0) and repeat above test.
Test #4, Polarity Reversal Time
This test will illustrate the operation and programming of the
polarity reversal feature.
Discussion
The HC5514X has a programmable polarity reversal time.
The evaluation board is equipped with a toggle switch for
evaluation of a 10 μ s and 20 μ s reversal times. Equation 5
gives the formula for programming a desired reversal time.
Test #5, Battery Selection/Power Sharing
Discussion (Battery Selection)
This test will illustrate the automatic switching of the supplies
by monitoring the V BH and V BL supply currents during
onhook and offhook with a 600 ? load across tip and ring.
Battery selection is a technique, for a two battery supply
system, where the SLIC automatically diverts the loop
current to the most appropriate supply for a given loop
length. This results in signi?cant power savings and lowers
the total power consumption on short loops. This technique
is particularly useful if most of the lines are short, and the on
hook condition requires a -48V battery. In Figure 3, it can be
seen that for long loops the majority of the current comes for
RSYNC – REV = ( 3.47k ? ) ( ReversalTime ( ms ) )
34.7k ? < RSYNC – REV > 73.2k ?
4
(EQ. 5)
the high battery supply (V BH ) and for short loops from the
low battery supply (V BL ).
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
HC55185EVAL2
EVALUATION PLATFORM HC55185+T
HE1015
BOOT CIRCUIT BREAKER 1POLE CLEAR
HE1020
BOOT CIRCUIT BREAKER 2POLE CLEAR
HE1050
BOOT CIRCUIT BREAKER 3POLE CLEAR
HE1070
BOOT CIRCUIT BREAKER 3POLE CLEAR
HFW30R-1STE1
HFW30R-1STE1-FFC/FPC CONN
HFW30S-2STE1
HFW30S-2STE1-USING HFW-P5SL
HHG
FUSEHOLDER AUTO INLINE FOR ATC
相关代理商/技术参数
HC5515
制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:ITU CO/PABX SLIC with Low Power Standby
HC5515_06
制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:ITU CO/PABX SLIC with Low Power Standby
HC55150
制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Low Power Universal SLIC Family
HC55150CB
制造商:Rochester Electronics LLC 功能描述:LOW PWR SLIC,POL REV/METERING,55DB BALANCE - Bulk
HC55150CBZ
功能描述:电信线路管理 IC LW PWR SLIC POLV/MTRING 55DB 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
HC55150CM
制造商:Rochester Electronics LLC 功能描述:LOW PWR SLIC,POL REV/METERING,55DB BALANCE - Bulk
HC55150CMZ
功能描述:电信线路管理 IC LW PWR SLIC POLV/MTRING 55DB 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
HC55151
制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Low Power Universal SLIC Family