Application Note 9871
TABLE 6. PROGRAMMABLE FEATURES OF THE HC5514X
R7, R9, R10, RSYNC_REV resistor. Used to set the polarity
S4 reversal time with C4 and provide an input for ring
Synchronization.
This external diode will inhibit large currents and potential
damage to the SLIC, in the event the V BH supply is shorted
to GND. If V BL is derived from V BH then this diode is not
required.
R6
R14, R15
RILIM Resistor. Used to set the current limit.
Used for transhybrid balance of the voice signal.
Floating the PTG Pin
The PTG pin is a high impedance pin (500k ? ) that is used to
program the 2-wire to 4-wire gain to either 0dB or -6dB.
R2, R3, R11, Used in the detection of ring trip.
R12
R8, R16, C13 Z T Resistor. Used in the impedances matching of
the 2-wire side.
If 0dB is required, it is necessary to ?oat the PTG pin. The
PC board interconnect should be as short as possible to
minimize stray capacitance on this pin. Stray capacitance on
this pin forms a low pass ?lter and will cause the 2-wire to
R17, R18,
S5, S6
S8
C4
C2
S1, S2, S3
Current Limiting Resistors for SHD and GKD_LVM
LEDs.
Switch 8 is used to program the 2-wire to 4-wire
transmission gain and 4-wire to 4-wire transhybrid
balance.
CRT_REV_LVM Capacitor. Filters ring trip and is
used in setting both the polarity reversal time and
line voltage measurement.
CH Capacitor. Provides AC and DC separation on
the 2-wire side.
Toggle switches to set the logic state of the SLIC.
4-wire gain to roll off at the higher frequencies.
If a 2-wire to 4-wire gain of -6dB is required, the PTG pin
should be grounded as close to the device as possible.
SPM Pin
For optimum performance, the PC board interconnect to the
SPM pin should be as short as possible. If pulses metering
is not being used, then this pin should be grounded as close
to the device pin as possible.
RLIM Pin
The current limiting resistor R LIM needs to be as close to the
RLIM pin as possible.
TABLE 7. SUPPLY DECOUPLING CAPACITORS
Layout of the 2-Wire Impedance Matching
C1, C5, C6, C10,
C11, C12
Supply decoupling capacitors.
Resistor Z T
Proper connection to the ZT pin is to have the external Z T
Layout Considerations
Systems with Dual Supplies (V BH and V BL )
If the V BL supply is not derived from the V BH supply, it is
recommended that an additional diode be placed in series
with the V BH supply. The orientation of this diode is anode
on pin 8 of the device and cathode to the external supply.
8
network as close to the device pin as possible.
The ZT pin is a high impedance pin that is used to set the
proper feedback for matching the impedance of the 2-wire
side. This will eliminate circuit board capacitance on this pin
to maintain the 2-wire return loss across frequency.
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