ATA5812-PLQW80 Atmel, ATA5812-PLQW80 Datasheet - Page 21
ATA5812-PLQW80
Manufacturer Part Number
ATA5812-PLQW80
Description
RF Transceiver RF Data Control Transceiver
Manufacturer
Atmel
Datasheet
1.ATA5811-PLHC.pdf
(92 pages)
Specifications of ATA5812-PLQW80
Wireless Frequency
226 KHz
Interface Type
4-Wire SPI
Noise Figure
7 dB
Output Power
10 dBm
Operating Supply Voltage
2.4 V to 5.25 V
Maximum Operating Temperature
+ 105 C
Mounting Style
SMD/SMT
Package / Case
QFN-48
Maximum Data Rate
20 Kbps
Minimum Operating Temperature
- 40 C
Modulation
ASK, FSK
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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5.14
4689F–RKE–08/06
RX/TX Switch
Table 5-9.
The RX/TX switch decouples the LNA from the PA in TX mode, and directs the received power
to the LNA in RX mode. To do this, it has a low impedance to GND in TX mode and a high
impedance to GND in RX mode. To design a proper RX/TX decoupling a linear simulation tool
for radio frequency design together with the measured device impedances of
10,
element values have to be found on board.
equivalent circuit of the switch. The principal switching operation is described here according to
the application of
Table 5-10.
Figure 5-11. Equivalent Circuit of the Switch
Table 5-7 on page
T
T
T
amb
amb
amb
433.92
Frequency
868.3
315
VS =
= +105°C
= –40°C
= +25°C
MHz
MHz
MHz
Measurements of Typical Output Power Relative to 3V/25°
Impedance of the RX/TX Switch RX_TX2 Shorted to GND
Figure 2-1 on page
20,
Table 5-10
–2.4 dB
–1.6 dB
–2.4 dB
Z(RX_TX1) TX Mode
2.4V
2.5 pF
6. The application of
(4.8 + j3.2)
(4.5 + j4.3)
and
11
(5 + j9)
Table 5-11 on page 22
RX_TX1
1.6 nH
Figure 5-11 on page 21
TX
5
–0.7 dB
–0.8 dB
3.0V
0 dB
Figure 3-1 on page 7
ATA5811/ATA5812
should be used, but the exact
Z(RX_TX1) RX Mode
shows an approximate
(11.3 – j214)
(10.3 – j153)
(8.9 – j73)
Table 5-1 on page
works similarly.
+0.9 dB
+0.1 dB
3.6V
0 dB
21
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