Philips TDA5051A - Manual (Page 10)

TDA5051A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
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