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Application Note 9871
The evaluation of all 9 tests require the following equipment:
a 600 ? (1 watt, 1%) load, a 1777 ? (2 watt, 1%) load, a
26.1k ? (1/4 watt, 1%) RDC_RAC resistor, two sine wave
generators, an AC/DC volt meter, three external supplies
(V BH , V BL , V CC ), a dual channel storage oscilloscope, a
9. Con?gured the SLIC in the reverse active state
(C3 = 1, C2 = 1, C1 = 0). Measure the supply currents and
compare to those in Table 1. Repeat step 8.
TABLE 1. SUPPLY CURRENTS AND POWER DISSIPATIONS
telephone, BNC to banana adaptor, a battery backed AC
SUPPLY
SUPPLY
POWER
source and a dynamic signal analyzer.
LOGIC
STATE
R L
( ? )
VOLTAGE
(DC)
CURRENT
TYP (mA)
DISSIPATION
(mW)
Application Tip: When terminating tip and ring, it is handy to
assemble terminators using a Pomona MDP dual banana
plug connector as the terminating resistor receptacle. Refer
to Figure 1 for details.
Forward
Active
Onhook
Without
Load
V BH = -48V
V BL = -24V
0.8
0.0001
38.4
0.0024
V CC = +5V
2.91
14.5
Forward
Offhook
V BH = -48V
30.0
1440
A
B
Active
with
600 ?
V BL = -24V
2.68
64.3
Load
V CC = +5V
4.2
21
600 ?
Reverse
Onhook
V BH = -48V
0.85
40.8
Active
Without
FIGURE 1. TERMINATION ADAPTER
Load
V BL = -24V
V CC = +5V
0.0001
2.97
0.0024
14.8
Using the termination shown in Figure 1 provides an
unobtrusive technique for terminating tip and ring while still
providing access to both signals using the banana jack
feature of the MDP connector. Posts are also available that
?t into holes A and B, providing a solderable connection for
Reverse
Active
Offhook
with
600 ?
Load
V BH = -48V
V BL = -24V
V CC = +5V
29.74
1.9
4.27
1427
45.6
21.3
the terminating resistor.
Test #1, Power Supply Current Veri?cation
A quick check of the evaluation board and sample is to
measure the supply currents. The readings should be similar
to the values listed in Table 1. The measurements can be
made using a series ammeter on each supply, or power
supplies with current displays.
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. Verify the thermal management switch (S9, located
towards the top middle of the board) is in the V BL = V BL
position.
4. Verify that the POL/REV switch S4 (lower right hand side
of the board) is in either the 10ms or 20ms position.
5. Con?gure the SHD switch (S5) to be in the JACK position.
This will allow an accurate reading of the V CC current by
removing the SHD LED current.
6. Con?gure the GKD_LVM switch (S6) to be in the BNC
position. This will allow an accurate reading of the V CC
current by removing the GKD_LVM LED current.
7. Con?gure the SLIC to be in the Forward Active State
(C3 = 0, C2 = 1, C1 = 0). Measure the supply currents and
compare to those in Table 1.
8. Terminate tip and ring with a 600 ? load. Measure the
supply currents and compare to those in Table 1. Remove
600 ? load.
2
Test #2, Normal Loop Feed Veri?cation
This test veri?es the correct tip and ring voltages in both
onhook and offhook forward active and reverse active states.
Loop current and ground key detect are also veri?ed via the
onboard SHD and GKD_LVM LEDs.
Discussion
The HC5514 is designed to have its most positive 2-wire
terminal (tip in the forward active state and ring in the
reverse active state) ?xed at a set voltage. This set voltage
depends upon the required overheads for the application.
The most negative 2-wire terminals voltage is dependent
upon the load across tip and ring and the programmable
current limit.
The tip and ring voltages for various loop resistances are
shown in Figure 2. The tip voltage remains relatively
constant as the ring voltage moves to limit the loop current
for short loops.
When power is applied to the SLIC, a loop current will ?ow
from tip to ring through the 600 ? load. Loop current
detection occurs when this loop current triggers an internal
detector that pulls the output of SHD low, illuminating the
LED through the +5V supply.
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