AS3991-BQFT austriamicrosystems, AS3991-BQFT Datasheet - Page 35

• Manufacturer Part Number: AS3991-BQFT
• Description: IC UHF RFID READER 64-QFN
• Manufacturer: austriamicrosystems

Specifications of AS3991-BQFT

• Rf Type: Read / Write
• Frequency: 840MHz ~ 960MHz
• Features: ISO-18000-6
• Package / Case: 64-VFQFN, Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AS3991-BQFT; AS3991-BQFTTR

AS3990/AS3991
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
Table 34. Modulator Control Register (15)
1. Preset at por=H and EN=L
PLL R, A/B Divider Main Register (16) – (three bytes deep)
Table 35. PLL R, A/B Divider Main Register (16)
1. Preset at por=H and EN=L
PLL A/B Divider Auxiliary Register (17) – (three bytes deep)
Table 36. PLL A/B Divider Auxiliary Register (17)
1. Preset at por=H and EN=L
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Default: set to 20 3F 00 (aux. modulation, ASK, level nominal)
Default: set to 40 D8 4F (R: 200kHz, N: 4335: 54*32+79*33 =>867MHz)
Default: set to 01 18 46 (R: 200kHz, N: 4550: 70*32+70*33 =>910MHz)
4:3
2:0
Bit
5
22:20
19:10
19:10
Bit
9:0
Bit
9:0
23
23
22
21
20
Signal Name
tx_lev<4:3>
tx_lev<2:0>
ook_ask
RefFreq<2:0>
Signal Name
Signal Name
B value
A value
lev_vco
B value
A value
eext_in
epresc
ai2x
ai4x
100% ASK enable with variable
delimiter length
TX output level coarse adjustment
TX output level fine adjustment
Increase internal PA bias
PLL reference divider
PLL main divider
Increase internal PA bias
VCO signal adjustment
Enable external RF input
EXT_IN
Enable divider and prescaler
PLL main divider
1
1
Function
1
Function
Function
Revision 3.81
Enforces 100% ASK modulation depth, bits
<13:8> are used to adjust the delimiter
length.
00: 0dB, nominal
10: -12dB
01: -6dB
0: nominal, decrease: 1…7: -1dB...-7dB,
step 1dB
Increase two times
000: 500kHz
001: 250kHz
100: 200kHz
010: 125kHz (Applies to AS3991 only)
101: 100kHz
110: 50kHz
111: 25kHz
Prescaler 32/33,
dividing ratio N=B*32+A*33, proposed A/B
ratio: 1/3…3
Increase four times
0: normal VCO connection
1: direct VCO connection
0: Internal VCO
1: External RF source is used.
1: In case internal PLL drives external VCO
Prescaler 32/33,
dividing ratio N=B*32+A*33, proposed A/B
ratio: 1/3…3
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