ATA5830N-PNQW Atmel, ATA5830N-PNQW Datasheet - Page 8

• Manufacturer Part Number: ATA5830N-PNQW
• Manufacturer: Atmel

Specifications of ATA5830N-PNQW

• Lead Free Status / Rohs Status: Supplier Unconfirmed

8
Atmel ATA5830/ATA5830N
In this type of application a PCB trace loop antenna is typically used. An internal antenna tun-
ing procedure tunes the resonant frequency of this loop antenna to the TX frequency. This is
accomplished with an integrated variable capacitor on the ANT_TUNE pin. RF_OUT and
RF_IN are optimally matched to the SPDT_TX and SPDT_RX pins of the integrated RX/TX
switch. The SPDT_ANT pin has an impedance of 50 for both the RX and TX functions. The
DC output voltage of the power amplifier is required at the SPDT_TX pin for proper operation.
Also, the RFIN pin needs a DC path to ground, which is easily achieved with the matching
shunt inductor. The impedance of the loop antenna is transformed to 50 with three capaci-
tors, two of them external and one built into the Atmel ATA5830 on the ANT_TUNE pin.
An external crystal, together with the fractional-N PLL within the Atmel ATA5830 is used to fix
the RX and TX frequency. Accurate load capacitors for this crystal are integrated, to reduce
system part count and cost. Only four supply blocking capacitors are needed to decouple the
different supply voltages AVCC, DVCC, VS and VS_PA of the Atmel ATA5830. The exposed
die pad is the RF and analog ground of the Atmel ATA5830. It is directly connected to AGND
via a fused lead. For applications operating in the 868.3MHz or 915MHz frequency bands, a
high band RF input is supplied, RFIN_HB, and must be used instead of RFIN_LB.
The Atmel ATA5830 is controlled using specific SPI commands via the SPI interface and an
internal EEPROM for application specific configuration.
Figure 1-3.
Typical 3V Stand Alone Application
1
2
3
4
5
6
7
8
RFIN_LB
RFIN_HB
SPDT_RX
SPDT_ANT
ANT_TUNE
SPDT_TX
RF_OUT
VS_PA
ATEST
32
_IO1
TEST
9
_EN
31
10
TEST
_IO2
30
11
ATA5830
12
29
Atmel
VS
13
28 27
VS
14 15
26
VS = 3V
VS
16
25
DGND
DVCC
PC5
PC4
PC3
PB2
PB1
PB0
24
23
22
21
20
19
18
17
9208DS–RKE–07/11