HC5520
R
TPS
C
VRX
0.47µF
R
X
100kΩ
TIPSEN
TIP
I
L
R
X
100kΩ
TIP
V
RX
50Ω
R
R
PT
600Ω
V
TR
HC5520
V
AC
PR
C
VTX
0.47µF
50Ω
RING
RING
T
V
X
TX
RINGSEN
100kΩ
T
100kΩ
X4W
R
RGS
R
4W
FIGURE 15. TRANSMIT OVER LOAD LEVEL AT 2W AND 4W TEST CIRCUIT - NORMAL AND REVERSE MODES
INPUT AT V
AC
SLIC OUTPUT
IMPEDANCE
SLIC TRANSMIT
GAIN
AT 1kHz
MEASUREMENT
SPECIFICATION AT 600Ω
V
= 2x(2.15V
)
600Ω
0dB
V
and V at
20log[V /(V /2)]
TR AC
AC
PEAK
TR
TX
2nd to 5th Harmonics
and 20log[V /(V /2)]
TX AC
R
TPS
C
VRX
R
X
100kΩ
TIPSEN
TIP
0.47µF
I
LONG
R
X
100kΩ
TIP
V
RX
50Ω
368Ω
368Ω
R
PT
2.16µF
V
T
V
AC
HC5520
V
R
R
PR
C
VTX
0.47µF
50Ω
RING
RING
T
X
I
LONG
V
TX
RINGSEN
100kΩ
T
100kΩ
X4W
R
RGS
R
4W
FIGURE 16. LONGITUDINAL IMPEDANCE TEST CIRCUIT - NORMAL AND REVERSE MODES
PARAMETER
INPUT
MEASUREMENT
SPECIFICATIONS
Longitudinal Impedance, Tip Side
Longitudinal Impedance, Ring Side
V
V
= 0dBm0 at Freq
= 0dBm0 at Freq
I
(rms) and V (rms)
Z
= V /I
T
AC
AC
LONG
T
LONG
LONG
LONG
I
(rms) and V (rms)
R
Z
= V /I
R
LONG
LONG
R
TPS
C
VRX
0.47µF
R
X
100kΩ
TIPSEN
I
LONG
R
X
100kΩ
TIP
V
RX
TIP
50Ω
20µF
20µF
V
R
SHDO
HC5520
AC
PT
2.16µF
TRIANGULAR
WAVEFORM
R
PR
C
VTX
0.47µF
50Ω
RING
RING
T
X
I
LONG
V
TX
RINGSEN
100kΩ
T
100kΩ
X4W
R
RGS
R
4W
FIGURE 17. ON-HOOK LONGITUDINAL CURRENT LIMIT TEST CIRCUIT - NORMAL AND REVERSE MODES
PARAMETER
INPUT
at Freq, I
MEASUREMENT
SPECIFICATIONS
Longitudinal Current Limit
V
= 15mA
LONG PEAK
SHDO
SHDO = Hi
AC
14
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