Figure 3, Figure 4, Figure 5 – Philips TDA5051A User Manual
Page 10: Tda5051a, Nxp semiconductors, Home automation modem
TDA5051A
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Product data sheet
Rev. 5 — 13 January 2011
10 of 29
NXP Semiconductors
TDA5051A
Home automation modem
Resolution bandwidth = 9 kHz; top: 0 dBV (RMS) = 120 dB
μV (RMS); marker at
−5 dBV (RMS) = 115 dBμV (RMS); the CISPR16 network provides an attenuation of 6 dB,
so the signal amplitude is 121 dB
μV (RMS).
Fig 3.
Carrier spectrum
Resolution bandwidth = 100 Hz; B
−20dB
= 3000 Hz (2
× 1500 Hz).
Fig 4.
Shaped signal spectrum
Fig 5.
AGC time constant definition (not to scale)
002aaf054
f (Hz)
10
5
10
6
−60
−40
−80
−20
0
V
o(rms)
(dBV)
−100
132.5 kHz
f (kHz)
117.5
147.5
002aaf057
−40
−30
−50
−20
−10
dBV
(RMS)
−60
132.5
20 dB
1500 Hz
002aaf058
V
RXIN
V
(I)
0
8.68 dB
AGC range
t
c(AGC)
(AGC time constant)
+30 dB
−6 dB
G
AGC
modulated sine wave 122 dB
μV amplitude
t