EVB71122
300 to 930MHz Receiver
Evaluation Board Description
3.1.5
Control Word R4
Name
Bits
Description
reference divider range
#default
[10:0]
R
000 0100 1011 value is 75
R counter range: 3 to 2047
AGC delay mode
#default
0
1
gain decrease and increase with delay
gain decrease without delay, gain increase with delay
AGCMODE
[11]
selects AGC delay mode in combination with AGCDEL bits, see section 4.1.4 (R3)
3.1.6
Control Word R5
Name
Bits
Description
reference divider value for IFF adjustment
[10:0]
RIFF
#default
#default
010 1001 1011 value is 667
IFF counter range: 4 to 2047
demodulation selection
0
1
FSK demodulation
ASK demodulation
MODSEL
[11]
selects modulation type when chip is controlled via SPI mode
3.1.7
Control Word R6
Name
Bits
Description
IFF preset value
[7:0]
IFFPRES
#default
#default
0110 1100
value is 108
IFF DAC preset at start of automatic tuning
IFF halt
0
1
auto tuning running
auto tuning halted
IFFHLT
[8]
[9]
suspends IFF automatic tuning
IFF tuning
IFFTUNE
0
1
disable and load DAC with IFFPRES
enable
#default
#default
reference Oscillator core current
00
01
10
11
85µA
170µA
270µA
355µA
ROCUR
[11:10]
39012 71122 01
Rev. 001
Page 18 of 32
EVB Description
Sept/06
MELEXIS [ Melexis Microelectronic Systems ]
