AMIS-49587_P2 Datasheet, PDF (12/55 Pages) ON Semiconductor – Power Line Carrier Modem

AMIS--49587
4.1.3 Transmitter External Parameters: Pin TX_OUT, ALC_IN, TX_ENB
To guarantee the transmitter external specifications the TX_CLK frequency must be 12 MHz ± 100 ppm.
Table 10. TRANSMITTER EXTERNAL PARAMETERS
Parameter
Test Conditions
Symbol
Min
Typ
Max
Unit
Maximum peak output level
fTX_OUT = 23.75 kHz
fTX_OUT = 95 kHz
Level control at max. output
V_{TX_OUT}
0.85
0.76
1.15
Vp
1.22
Second order harmonic distortion
fTX_OUT = 95 kHz
Level control at max. output
HD2
--56
dB
Third order harmonic distortion
fTX_OUT = 95 kHz
Level control at max. output
HD3
--58
dB
Frequency accuracy of the
generated sine wave
(Notes 4 and 6)
Df_{TX_OUT}
30
Hz
Capacitive output load at pin
TX_OUT
(Note 4)
CL_{TX_OUT}
20
pF
Resistive output load at pin
TX_OUT
RL_{TX_OUT}
5
kΩ
Turn off delay of TX_ENB output
Automatic level control attenuation
step
(Note 5)
Td_{TX_ENB}
ALC_step
0.25
2.9
0.5
ms
3.1
dB
Maximum attenuation
Low threshold level on ALC_IN
High threshold level on ALC_IN
Input impedance of ALC_IN pin
Power supply rejection ration of the
transmitter section
ALC_range
VTL_{ALC_IN}
VTH_{ALC_IN}
R_{ALC_IN}
PSRR_{TX_OUT}
20.3
--0.46
--0.68
111
10 (Note 7)
21.7
dB
--0.36
V
--0.54
V
189
kΩ
35 (Note 8) dB
4. This parameter will not be tested in production.
5. This delay corresponds to the internal transmit path delay and will be defined during design.
6. Taking into account the resolution of the DDS and an accuracy of 100 ppm of the crystal.
7. A sinusoidal signal of 10 kHz and 100 mVpp is injected between VDDA and VSSA. The digital AD converter generates an idle pattern. The
signal level at TX_OUT is measured to determine the parameter.
8. A sinusoidal signal of 50 Hz and 100 mVpp is injected between VDDA and VSSA. The digital AD converter generates an idle pattern. The
signal level at TX_OUT is measured to determine the parameter.
The LPF filter + amplifier must have a frequency characteristic between the limits listed below. The absolute output level
depends on the operating condition. In production the measurement will be done for relative output levels where the 0 dB
reference value is measured at 50 kHz with a signal amplitude of 100 mV.
Table 11. TRANSMITTER FREQUENCY CHARACTERISTICS
Attenuation
Frequency (kHz)
Min
Max
Unit
10
--0.5
0.5
dB
95
--1.3
0.5
dB
130
--4.5
--2.0
dB
165
--3.0
dB
330
--18.0
dB
660
--36.0
dB
1000
--50
dB
2000
--50
dB
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