NXP Semiconductors
TDA5051A
Home automation modem
11. Timing
11.1 Configuration for clock
CLK_OUT
f
osc
XTAL
MICROCONTROLLER
OSC1
7
TDA5051A
DGND
5
002aaf042
GND
For parameter description, see
Table 6.
Fig 6.
External clock
CLK_OUT
MICROCONTROLLER
CLK_OUT
1
/ f
2 osc
4
8
OSC2
C1
TDA5051A
DGND
5
7
OSC1
Rp
XTAL
C2
GND
002aaf043
For parameter description, see
Table 6.
Fig 7.
Table 6.
Typical configuration for on-chip clock circuit
Clock oscillator parameters
Carrier
frequency f
cr
95 kHz to
148.5 kHz
Clock output frequency External components
1
⁄
f
2 osc
3.040 MHz to 4.752 MHz
C1 = C2 = 27 pF to 47 pF;
R
p
= 2.2 MΩ to 4.7 MΩ;
XTAL = standard quartz crystal
Oscillator
frequency f
osc
6.080 MHz to
9.504 MHz
Table 7.
Symbol
f
osc
Calculation of parameters depending on the clock frequency
Parameter
oscillator frequency
Conditions
with on-chip oscillator: frequency of
the crystal quartz
with external clock: frequency of the
signal applied at OSC1
Unit
Hz
Hz
Hz
Hz
s
s
s
f
CLKOUT
f
cr
t
su
t
h
t
W(DI)(min)
clock output frequency
carrier frequency/digital filter tuning
frequency
set-up time of the shaped burst
hold time of the shaped burst
minimum pulse width of DATA_IN
signal
1
⁄
1
⁄
2
f
osc
64
f
osc
23/f
cr
or 1472/f
osc
23/f
cr
or 1472/f
osc
t
su
+ 1/f
cr
TDA5051A
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© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 5 — 13 January 2011
11 of 29
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