AT86RF211SAHW Atmel, AT86RF211SAHW Datasheet - Page 16
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AT86RF211SAHW
Manufacturer Part Number
AT86RF211SAHW
Description
Manufacturer
Atmel
Datasheet
1.AT86RF211SAHW.pdf
(64 pages)
Specifications of AT86RF211SAHW
Lead Free Status / Rohs Status
Compliant
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4.2.7
4.2.8
16
0894C–WIRE–11/08
IF1 Narrow Bandwidth Filters
IF2 Filtering and Gain
Figure 4-11. Schematic Output of the Second Mixer
IF1 and IF2 filters can be replaced by a single narrowband 10.7 MHz crystal filter. This solution has the
following advantages:
IF2 filtering provides a narrow channel selection. If an IF2 filter is not used, it should be replaced by a
coupling capacitor superior to 1 nF, the IF1 filter therefore being the only part achieving the channel
selection. Available commercial filters with a 35 kHz bandwidth provide data rates up to 19.6 kbps if crys-
tal temperature drifts are very low.
For faster communication and/or wider channelization, this ceramic filter can be replaced by an LC band-
pass filter as suggested in
Figure 4-12. LC Band-pass Filter
• Only one cheap IF1 filter is used, reducing costs
• Size is optimized
• Selectivity remains good, even if a very narrow 455 kHz filter is not used
Filter
Gain
Figure 4-12 on page
10 nF
~ F1
40 kHz or higher
F1
F2
1600 Ω
16.
~ F2
Global Response
10 nF
IF2OUT
Frequency
e2v semiconductors SAS 2008
AT86RF211S
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