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TDA5051

Home automation modem

NXP Semiconductors. 

NXP Semiconductors

TDA5051A

Home automation modem

Table 7. Calculation of parameters depending on the clock frequency …continued

Symbol Parameter

Conditions

tW(burst)(min)

tc(AGC)

tsu(demod)

th(demod)

minimum burst time of VO(DC) signal tW(DI)(min) + th

AGC time constant

2514/fosc

demodulation set-up time

3200/fosc (max.)

demodulation hold time

3800/fosc (≈max.)

Unit

s

s

s

s

TX_OUT

VO(DC)

0

DATA_IN

tW(burst)

tW(burst)(min)

tsu

tW(DI)

th

tW(DI)(min)

(1)

(2)

(3)

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(1) tW(DI) > tW(DI)(min)

(2) tW(DI)(min) = tsu + 1/fcr

(3) tW(DI)(min) < tsu; 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 th)

active with DC offset

100 %

tW(burst)

tsu

th

Fig 9. Pulse shape characteristics

002aaf045

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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