ATAB5757 Atmel, ATAB5757 Datasheet - Page 8
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ATAB5757
Manufacturer Part Number
ATAB5757
Description
BOARD DEMO RF TRANSMITTER 433MHZ
Manufacturer
Atmel
Series
Smart RFr
Type
Transmitterr
Specifications of ATAB5757
Frequency
433MHz
Wireless Frequency
433 MHz
Modulation
ASK, FSK
For Use With/related Products
ATA5757 @ 433MHz
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
4.3
8
Accuracy of Frequency Deviation
ATA5756/ATA5757
Figure 4-4.
The accuracy of the frequency deviation using the XTAL pulling method is about ±20% if the fol-
lowing tolerances are considered. One important aspect is that the values of C
crystals are strongly correlated which reduces the tolerance of the frequency deviation.
Figure 4-5.
Using a crystal with a motional capacitance of C
C
C
internal FSK switch with C
the resulting C
deviation of ±19.3 kHz with worst case tolerances of ±15.8 kHz to ±23.2 kHz.
LNOM
0
= 297 × C
ENABLE
= 18 pF and a parallel capacitance of C
FSK
ASK
CLK
M
4
Timing ASK Mode with ENABLE Connected to the Microcontroller
Tolerances of Frequency Modulation
(the correlation has a tolerance of 10%, so C
and C
XTAL
Power-down
V
S
5
~
values are C
Switch
= 0.9 pF ±20% and estimated parasites of C
ΔT
XTO
4
Power-up,
= 10 pF ±1% and C
PA off
Crystal equivalent circuit
C
> 250 µs
M
L
M
C
M
0
= 4.37 fF ±15%, a nominal load capacitance of
Power-up,
0
= 1.30 pF correlated with C
PA on
(High)
R
S
5
= 15 pF ±1% for a nominal frequency
0
Power-up,
= 267 to 326 × C
PA off
(Low)
C
Stray
C
5
C
Switch
C
Stray
4
Power-down
0
and C
= 0.7 pF ±10%,
M
). If using the
4702J–RKE–09/08
M
M
results in
of typical