HC5520
R
TPS
C
VRX
0.472µF
R
X
100kΩ
TIPSEN
TIP
100kΩ
R
V
TIP
X
RX
50Ω
R
2.4kΩ
PT
>9kΩ
SHDO
HC5520
R
PR
SW
C
VTX
0.47µF
50Ω
RING
RINGSEN
RING
V
T
X
TX
100kΩ
100kΩ
T
X4W
R
RGS
R
4W
FIGURE 6. SWITCH HOOK DETECTION TEST CIRCUIT
PARAMETER
On Hook Condition
Off Hook Detection
INPUT
MEASUREMENT
SHDO
SPECIFICATIONS
SHDO = Hi
SW = Left
SW = Right
SHDO
SHDO = Lo
R
TPS
C
VRX
0.47µF
R
X
100kΩ
TIPSEN
TIP
R
100kΩ
TIP
V
RX
X
50Ω
R
PT
R
SHDO
L
HC5520
R
PR
SW
C
VTX
0.47µF
50Ω
RING
RING
T
X
V
TX
RINGSEN
100kΩ
T
100kΩ
X4W
R
RGS
R
4W
t
PERIOD
t
t
MAKE
BREAK
ON
SW
OFF-HOOK
OFF-HOOK
ON-HOOK
OFF-HOOK
OFF
t
MEAS
SHDO
ON-HOOK
OFF-HOOK
FIGURE 7. DIAL PULSE DISTORTION TEST CIRCUIT AND WAVEFORMS
PARAMETER
Percent Break
INPUT
MEASUREMENT
SPECIFICATIONS
SW = On, Off, . . .
SW = On, Off, . . .
t
and t
(t
/t ) x 100%
BREAK PERIOD
BREAK
PERIOD
Dial Pulse Distortion
t
and t
and t
MEAS
Abs[(t
- t ] x 100%
)/t
BREAK
PERIOD
BREAK MEAS PERIOD
10
HARRIS [ HARRIS CORPORATION ]
