EVB7122
27 to 930MHz Transceiver
Evaluation Board Description
3.1.4
C – word
Name
Bits
[16:0]
64d .. 131071d
0
1
Set the desired frequency range
recommended at f
RF
< 500 MHz
recommended at f
RF
> 500MHz
Some tail current sources are linked to this bit in order to save current for low frequency
operations.
Description
Feedback divider ratio in RX operation mode
NR
BAND
[17]
VCO active current
VCOCUR
[19:18]
00
01
10
11
low current (300 µA)
standard current (500 µA)
high1 current (700 µA)
high2 current (900 µA)
Phase Detector polarity
0
PFDPOL
[20]
1
negative
#default
VCO
OUTPUT
FREQUENCY
pos
neg
VCO INPUT VOLTAGE
positive
0
LNA gain control mode
external LNA gain control
LNA gain will be set via pin GAIN_LNA.
#default
LNACTRL
[21]
1
internal LNA gain control
LNA gain will be set via bit LNAGAIN (bit 12 in A-word). Nevertheless pin GAIN_LNA must
be connected to either VCC or VEE.
39012 07122 02
Rev. 005
Page 11 of 24
EVB Description
June/07
MELEXIS [ Melexis Microelectronic Systems ]
