ATA5823 ATMEL Corporation, ATA5823 Datasheet - Page 7

• Manufacturer Part Number: ATA5823
• Description: Uhf Ask/fsk Transceiver Ata5823 Ata5824
• Manufacturer: ATMEL Corporation

4. Typical Car Application for Bi-directional RKE
Figure 4-1.
4829D–RKE–06/06
Typical Car Application for Bi-directional RKE with 10 dBm TX Power, 433.92 MHz
RF
L
connector
4
50
OUT
C
AVCC
SAW filter
C
11
Figure 4-1
components are 11 capacitors, 1 resistor, 4 inductors, a SAW filter and a crystal. C
are 68 nF voltage supply blocking capacitors. C
internal voltage regulator. C
used for the internal quasi-peak detector and for the high-pass frequency of the data filter. C
C
about 5.6 nH to 56 nH. A load capacitor for the crystal of 9 pF is integrated. R
and sets the output power at RF
which has high efficiency and wideband operation, is typically used here, it is recommended to
use a SAW filter to achieve high sensitivity in case of powerful out-of-band blockers. L
C
signal to meet regulations.
10
11
9
L
2
together form a low-pass filter, which is needed to filter out the harmonics in the transmitted
are RF matching capacitors in the range of 1 pF to 33 pF. L
L
C
1
L
5
3
shows a typical 433.92 MHz V
C
C
R
8
9
1
C
NC
NC
NC
RF_IN
NC
433_N868
NC
R_PWR
PWR_H
RF_OUT
NC
NC
7
5
is a 10 nF supply blocking capacitor. C
ATA5823/ATA5824
C
1
OUT
V
C
CC
2
to about 10 dBm Since a quarter wave or PCB antenna,
= 4.4 V ... 5.25 V
CC
C
4
= 4.4V to 5.25V RKE car application. The external
SDO_TMDO
SDI_TMDI
2
TEST3
CDEM
VSINT
POUT
is a 2.2 µF supply blocking capacitor for the
RSSI
SCK
CLK
IRQ
CS
NC
C
XTAL2
6
ATA5823/ATA5824
2
to L
13.25311 MHz
C
VCC
3
Microcontroller
6
4
is a 15 nF fixed capacitor
are matching inductors of
VSS
1
is typically 22 k
1
, C
1
, C
3
and C
10
and
7
to
7
4