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