EVB71122_15 Datasheet, PDF (19/31 Pages) Melexis Microelectronic Systems – 300 to 930MHz Receiver Evaluation Board Description

EVB71122
300 to 930MHz Receiver
Evaluation Board Description
3.1.5 Control Word R4
Name
R
AGCMODE
Bits
[10:0]
[11]
Description
reference divider range
000 0100 1011 value is 75
R counter range: 3 to 2047
#default
AGC delay mode
0 gain decrease and increase with delay
1 gain decrease without delay, gain increase with delay
#default
selects AGC delay mode in combination with AGCDEL bits, see section 3.1.4 (R3)
3.1.6 Control Word R5
Name
RIFF
MODSEL
Bits
[10:0]
[11]
Description
reference divider value for IFF adjustment
010 1010 1100 value is 684
IFF counter range: 4 to 2047
demodulation selection
0 FSK demodulation
1 ASK demodulation
selects modulation type when chip is controlled via SPI mode
#default
#default
3.1.7 Control Word R6
Name
IFFPRES
IFFHLT
IFFTUNE
ROCUR
Bits
[7:0]
[8]
[9]
[11:10]
Description
IFF preset value
0101 1011
value is 91
IFF DAC preset at start of automatic tuning
IFF halt
0 auto tuning running
1 auto tuning halted
suspends IFF automatic tuning
IFF tuning
0 disable and load DAC with IFFPRES
1 enable
reference Oscillator core current
00 85µA
01 170µA
10 270µA
11 355µA
#default
#default
#default
#default
39012 71122 01
Rev. 005
Page 19 of 31
EVB Description
Nov/15