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Application Note 9814
Ringing Con?guration
J5
J6
J10
J4
JP3
J7
JP9
J8
J9
JP7
J11
J3
HC55185
JP6
JP4
JP8
CODEC
APP CKT
J12
APP CKT
JP5
J13
J2
JP1
JP2
JP11
JP12
JP10
J14
J1
S1
1
S2
0
S3
0
S4
x
S5
1
S6
1
CLOCK GENERATION & MUX
J15
FIGURE 5. RINGING CONNECTORS AND JUMPERS
Description
The ringing con?guration supports full evaluation of the
ringing capability of the HC55185 device. The evaluation
board design does not include a 20Hz digital code generator,
therefore, all ringing waveforms will be sourced by external
test equipment.
Power Supply Connections
Power should be applied to the evaluation board using the
primary power cable. Either J5 or J6 may be used. Prior to
applying power, the voltage setting of each supply should be
veri?ed. The power supplies should be turned off while
mating the primary power cable to the evaluation board.
Jumper Settings
The jumper JP5 provides three positions for different ringing
techniques.
TABLE 2. JP5 JUMPER POSITIONS
ringing can be evaluated. The digital interface to the CODEC
would be provided by the BNC connectors J10 thru J13.
Verify JP11 is open prior to driving signals into the BNC
connectors. An output level of 0dBm from the CODEC will
provide full scale ringing when operating from -100V battery.
External Ringing Source
Using an external function generator at J9 provides the most
control of the ringing waveform. The ?exibility of the ringing
interface can be fully exercised by the function generator. To
evaluate DC offsets during ringing, the capacitor C RS must
be shorted. Most functions generators provide DC offset as
part of the output waveform. Positive DC offsets on VRS
move Tip towards ground and Ring towards battery.
Trapezoidal Ringing
A logic level square wave, at J9, with 50% duty cycle will be
shaped by the components R TRAP and C TRAP when this
jumper position is selected. The components shipped with
JP5 POSN
CODEC
EXT
TRAP
DESCRIPTION
Connects the CODEC receive output to the device
ringing input. Signal path is AC coupled.
Connects the VRS connector J9 to the device ringing
input. Signal path is AC coupled.
Connects the VRS connector J9 thru RC network to
the evaluation board will result in a 75V RMS trapezoidal
ringing waveform when operating from a -100V battery.
Ring Trip Control
Three very distinct actions occur when the devices detects a
ring trip. First, the DET output is latched low. The latching
mechanism eliminates the need for software ?ltering of the
the device ringing input. Signal path is AC coupled.
CODEC Ringing
Most test equipment designed to evaluate the CODEC PCM
interface are capable of output frequencies as low as 20Hz.
If such a piece of equipment is available, then CODEC
4-6
detector output. The latch is cleared when the operating
mode is changed externally. Second, the VRS input is
disabled, removing the ring signal from the line. Third, the
device is internally forced to the forward active mode. The
low battery is not automatically selected upon ring trip.
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