ATA5746 ATMEL Corporation, ATA5746 Datasheet - Page 16

• Manufacturer Part Number: ATA5746
• Description: (ATA5745 / ATA5746) UHF ASK/FSK Receiver
• Manufacturer: ATMEL Corporation

16
ATA5745/ATA5746 [Preliminary]
Lower values of C
higher values of C
Figure 3-2.
The relationship between f
Table 3-1.
Attention must be paid to the harmonics of the CLK_OUT output signal f
harmonics produced by an microprocessor clocked with it, since these harmonics can disturb
the reception of signals if they get to the RF input. If the CLK_OUT signal is used, it must be
carefully laid out on the application PCB. The supply voltage of the microcontroller must also be
carefully blocked.
Frequency [MHz]
433.92 (ATA5745)
315.0 (ATA5746)
XTAL1
C
L1
XTO Block Diagram
Calculation of f
m
m
(up to 15 fF) can also be used, with only little influence on pulling.
can be used, slightly increasing the start-up time. Lower values of C
XTO
XTAL2
RF
and the f
C
CLK_OUT_CTRL0
L2
RF
is shown in
f
13.57375
XTO
13.1433
f
[MHz]
FXTO
Table
CLK_OUT_CTRL1
Amplitude
/3, /6, /12
Detector
Divider
Divider
/16
3-1.
f
f
XTO
XTO
CLK_OUT
f
x 32 – 440 kHz
x 24 – 440 kHz
CLK_OUT
DCLK
f
XTO_OK
RF
as well as to the
4596A–RKE–05/06
&
0
or