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AS3911 Datasheet(PDF) 21 Page - ams AG

Part # AS3911
Description  NFC Initiator / HF Reader IC
PDF  149 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3911 Datasheet(HTML) 21 Page - ams AG

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ams Datasheet, Confidential: 2013-Oct [2-03]
AS3911 – 21
Appl icatio n I n f o rm a t i o n
Figure 14:
First and Third Stage Zero Setting
Figure 15 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 15:
Receiver Filter Selection and Gain Range
rec1<2> h200
rec1<1> h80
rec1<0> z12k
First Stage
Zero
Third Stage
Zero
0
0
0
60 kHz
400 kHz
1
0
0
60 kHz
200 kHz
010
40 kHz
80 kHz
0
0
1
12 kHz
200 kHz
011
12 kHz
80 kHz
1
0
1
12 kHz
200 kHz
Other
Not used
Gain [dB]
Comment
000
0
0
0
43.4
28
26.4
11
49.8
Automatic preset for ISO14443A fc/128
and NFC Forum Type 1 Tag
000
1
0
0
44
29
27.5
12
49.7
Automatic preset for ISO14443B fc/128
ISO14443 fc/64
001
1
0
0
44.3
29
27
11.7
49.8
Recommended for 424/484 kHz
sub-carrier
000
0
1
0
41.1
25.8
23.6
8.3
46.8
Alternative choice for ISO14443 fc/32 and
fc/16
100
0
1
0
32
17
17.2
2
37.6
Automatic preset for ISO14443 fc/32 and
fc/16
Alternative choice for fc/8 (1.7 kb/s)
100
0
0
0
32
17
17.2
2
37.6
Alternative choice for fc/8 (1.7 kb/s)



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