AS3911 datasheet(22/159 Pages) AMSCO

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ams Datasheet

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[v2-11] 2016-Jun-13

AS3911 − Application Information

Figure 16:

First and Third Stage Zero Setting

Figure 17 provides information on the recommended filter

settings. For all supported operation modes and receive bit

rates there is an automatic preset defined, additionally some

alternatives are listed. Automatic preset is done by sending

direct command Analog Preset. There is no automatic preset for

Steam and Transparent modes. Since selection of filter

characteristics also modifies gain, the gain range for different

filter settings is also listed.

Figure 17:

Receiver Filter Selection and Gain Range

rec1<2> h200

rec1<1> h80

rec1<0> z12k

First Stage

Zero

Third Stage

Zero

60 kHz

400 kHz

60 kHz

200 kHz

40 kHz

80 kHz

12 kHz

200 kHz

12 kHz

80 kHz

12 kHz

200 kHz

Other

Not used

Gain [dB]

Comment

000

43.4

26.4

49.8

Automatic preset for ISO14443A fc/128

and NFC Forum Type 1 Tag

000

27.5

49.7

Automatic preset for ISO14443B fc/128

ISO14443 fc/64

001

44.3

11.7

49.8

Recommended for 424/484 kHz

sub-carrier

000

41.1

25.8

23.6

8.3

46.8

Alternative choice for ISO14443 fc/32 and

fc/16

100

17.2

37.6

Automatic preset for ISO14443 fc/32 and

fc/16

Alternative choice for fc/8 (1.7 kbit/s)

100

17.2

37.6

Alternative choice for fc/8 (1.7 kbit/s)

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