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Application Note 9871
0
-5
-10
-15
-20
-25
-30
-35
TIP
RING
-2.5V
CONSTANT TIP TO RING
VOLTAGE REGION
VBH = -48V
RD = 41.2k ?
ROH = 38.3k ?
RDC_RAC = 19.6k ?
RILim = 33.2k ?
Veri?cation of SHD:
1. With the SLIC in the forward active state, the SHD LED is
on when tip and ring are terminated with 600 ? and off
when tip and ring are an open circuit.
Veri?cation of GKD:
1. Con?gure the SLIC to be in the Tip Open State
(C3 = 1, C2 = 0, C1 = 0).
2. The GKD_LVM LED is on when ring is shorted to ground
-40
-45
CONSTANT
LOOP CURRENT
REGION
-44.5V
and off when ring is an open circuit. Notice that the SHD
LED will also be on.
-50
200
600 1000 1400 1800 2000
4K
6K
8K
10K
Test #3, Gain Veri?cation
LOOP RESISTANCE ( ? )
This test will verify the SLIC is operating properly and that
A 4-2 = ----------- = -2 ------------------------- = – 2 ----------------------------------------------
Z L + ? ---------- + 2R P ?
FIGURE 2. TIP AND RING VOLTAGES vs LOOP RESISTANCE
The Ground Key detector (GKD) operation is veri?ed by
con?guring the HC5514X in the tip open state and grounding
the 4-wire to 2-wire gain (Equation 1) is -1.0 (0.0dB).
V TR Z L Z L
V RX Z L + Z TR Z T
? 200 ?
(EQ. 1)
the ring pin. Grounding the ring pin results in a current that
triggers an internal detector that pulls the output of
GKD_LVM low, illuminating the LED through the +5V supply.
Setup (Tip and Ring Voltages)
The programmable 2-wire to 4-wire transmission gain
(Equation 2) will also be veri?ed by measuring the SLIC’s 4-
wire to 4-wire gain with the PTG pin ?oating (A 2-4 is 0.9
(0.91dB) and grounded (A 2-4 is 0.56 (-5.0dB).)
A 2-4 = ----------- = -----------------------------
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
V TX Z TR - 2R P
V TR Z TR
(EQ. 2)
(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. Con?gure S5 and S6 switches to be in the LED position.
6. Disconnect any loads from across tip and ring.
7. Measure tip and ring voltages with respect to ground and
compare to those in Table 2 (onhook).
8. Terminate tip and ring with a 600 ? load.
9. Measure tip and ring voltages with respect to ground and
compare to those in Table 2 (600 ? ).
10. Con?gure the SLIC to be in the Reverse Active State
(C3 = 1, C2 = 1, C1 = 0).
11. Repeat steps 6 through 9.
Discussion
When tip and ring are terminated with 600 ? load, the SLIC
will exhibit unity gain from the 4-wire VRX input pin to across
the 2-wire tip and ring pins (V TR ). The dB gain is calculated
in Equation 3. When an open circuit exists, a mismatch
occurs and the tip to ring voltage doubles.
An easy way to measure the 2-wire to 4-wire transmit gain,
without a ?oating signal generator on the 2-wire side, is to
measure the 4-wire to 4-wire gain. This way the source can
be applied on the ground referenced 4-wire side to the VRX
pin. Given that the 4-wire to 2-wire gain is approximately
one, it follows that the 2-wire to 4-wire transmission gain is
also approximately equal to the 4-wire to 4-wire gain. The dB
4w to 4w gain is calculated in Equation 4.
dB 4W – 2W = 20 log -----------
TABLE 2. TIP AND RING VOLTAGES
HC5514X
TIP
RING
V TR
V RX
(EQ. 3)
dB 4W – 4W = 20 log -----------
LOGIC STATE
R L
( ? )
VOLTAGE
REFERENCE
D TO GND
VOLTAGE
REFERENCED
TO GND
V TX
V RX
(EQ. 4)
Forward Active
V BH = -48V
V BL = -24V
V CC = +5V
Reverse Active
V BH = -48V
V BL = -24V
V CC = +5V
Onhook
Offhook
600
Onhook
Offhook
600
-2.6
-6.3
-44.6
-24.4
-44.6
-24.5
-2.5
-6.3
Setup (4-Wire to 2-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 S4 (lower right hand side of
the board) is in either the 10ms or 20ms position.
5. Terminate tip and ring with a 600 ? load.
3
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