TDA5051ATD-T Datasheet, PDF (12/29 Pages) NXP Semiconductors – Home automation modem

NXP Semiconductors
TDA5051A
Home automation modem
Table 7. Calculation of parameters depending on the clock frequency …continued
Symbol Parameter
Conditions
t_{W(burst)(min)}
t_c(AGC)
t_su(demod)
t_h(demod)
minimum burst time of V_O(DC) signal t_W(DI)(min) + t_h
AGC time constant
2514/f_osc
demodulation set-up time
3200/f_osc (max.)
demodulation hold time
3800/f_osc (≈max.)
Unit
s
s
s
s
TX_OUT
V_O(DC)
0
DATA_IN
t_W(burst)
t_{W(burst)(min)}
t_su
t_W(DI)
t_h
t_W(DI)(min)
(1)
(2)
(3)
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(1) t_W(DI) > t_W(DI)(min)
(2) t_W(DI)(min) = t_su + 1/f_cr
(3) t_W(DI)(min) < t_su; wrong operation
Fig 8. Relationship between DATA_IN and TX_OUT (see Table 8)
Table 8. Relationship between DATA_IN and TX_OUT
X = don’t care.
PD
DATA_IN TX_OUT
1
X
high-impedance
0
1
0
0
high-impedance (after t_h)
active with DC offset
100 %
t_W(burst)
t_su
t_h
Fig 9. Pulse shape characteristics
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TDA5051A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 13 January 2011
© NXP B.V. 2011. All rights reserved.
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