ATA5429-PLSW datasheet(16/100 Pages) ATMEL

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4841D–WIRE–10/07

ATA5423/ATA5425/ATA5428/ATA5429

The ATA5423/ATA5425/ATA5428/ATA5429 can also receive FSK and ASK modulated signals if

they are much higher than the I1dBCP. It can typically receive useful signals at 10 dBm. This is

often referred to as the nonlinear dynamic range which is the maximum to minimum receiving

signal and is 116 dB for 20 Kbit/s Manchester. This value is useful if two transceivers have to

communicate and are very close to each other.

Figure 3-5.

Close In 6 dB Blocking Characteristic and Image Response at 433.92 MHz

This high blocking performance even makes it possible for some applications using quarter

wave whip antennas to use a simple LC band-pass filter instead of a SAW filter in the receiver.

When de sig n in g such a n LC f ilte r t a ke int o accou n t th at t he 3 d B blocking at

433.92 MHz/2 = 216.96 MHz is 43 dBC and at 433.92 MHz/3 = 144.64 MHz is 48 dBC and at

× (433.92 MHz + 226 kHz) + –226 kHz = 868.066 MHz/868.518 MHz is 56 dBC. And espe-

cially that at 3

× (433.92 MHz + 226 kHz) + 226 kHz = 1302.664 MHz the receiver has its

second LO harmonic receiving frequency with only 12 dBC blocking.

Table 3-6.

Blocking 6 dB Above Sensitivity Level with BER < 10

–3

Frequency Offset

Blocker Level

Blocking

+0.75 MHz

–45 dBm

55 dBC/61 dBS

–0.75 MHz

–45 dBm

55 dBC/61 dBS

+1.5 MHz

–38 dBm

62 dBC/68 dBS

–1.5 MHz

–38 dBm

62 dBC/68 dBS

+10 MHz

–30 dBm

70 dBC/76 dBS

–10 MHz

–30 dBm

70 dBC/76 dBS

-10

-0.2

0.2

0.4

-1.0

-0.8

-0.6

-0.4

Distance of Interfering to Receiving Signal (MHz)

0.6

0.8

1.0

Distance of Interfering to Receiving Signal (MHz)

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