ATA8201-EK Atmel, ATA8201-EK Datasheet - Page 11

• Manufacturer Part Number: ATA8201-EK
• Description: BOARD RF RCVR FLEXIBLE 315MHZ
• Manufacturer: Atmel
• Type: Receiver, ASK/FSKr

Specifications of ATA8201-EK

• Frequency: 313MHz ~ 317MHz
• For Use With/related Products: ATA8201
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

2.4
4971C–INDCO–04/09
RX Supply Current Versus Temperature and Supply Voltage
As can be seen in
perature has an influence of about ±1.0 dB, and a frequency offset of ±160 kHz also influences
by about ±1 dB. All these influences, combined with the sensitivity of a typical IC (–105 dB), are
then within a range of –103.0 dBm and –107.0 dBm over temperature, supply voltage, and fre-
quency offset. The integrated IF filter has an additional production tolerance of ±10 kHz, hence,
a frequency offset between the receiver and the transmitter of ±160 kHz can be accepted for
XTAL and XTO tolerances.
Note:
This small sensitivity change over supply voltage, frequency offset, and temperature is very
unusual in such a receiver. It is achieved by an internal, very fast, and automatic frequency cor-
rection in the FSK demodulator after the IF filter, which leads to a higher system margin. This
frequency correction tracks the input frequency very quickly. If, however, the input frequency
makes a larger step (for example, if the system changes between different communication part-
ners), the receiver has to be restarted. This can be done by switching back to Standby mode
and then again to Active mode (pin RX 1
ASK_NFSK (0
Table 2-7
and temperature with VS = VS3V_AVCC = VS5V.
Table 2-6.
Table 2-7.
For the demodulator used in the ATA8201/ATA8202, the tolerable frequency offset does not
change with the data frequency. Hence, the value of ±160 kHz is valid for 1 Kbit/s to 10 Kbits/s.
shows the typical supply current of the receiver in Active mode versus supply voltage
VS = VS3V_AVCC = VS5V
VS = VS3V_AVCC = VS5V
Measured Current in Active Mode ASK
Measured Current in Active Mode FSK
1
Figure 2-5 on page
T
T
0).
amb
amb
=
=
25°C
25°C
10, the supply voltage has almost no influence. The tem-
0
1) or by generating a positive pulse on pin
ATA8201/ATA8202
6.5 mA
6.7 mA
3.0V
3.0V
11