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EVB7122
27 to 930MHz Transceiver
Evaluation Board Description
3.1.3
B – word
Name
Bits
Description
RT
[9:0]
4d .. 1023d
Reference divider ratio in TX operation mode
Set the desired steady state current of the reference oscillator
ROMIN
[12:10]
000
001
010
011
100
101
110
111
0 μ A
75 μ A
150 μ A #default
225 μ A
300 μ A
375 μ A
450 μ A
525 μ A
The control circuitry regulates the current of the oscillator core
between the values ROMAX and ROMIN. As the regulation input
signal the amplitude on pin RO is used. If the ROMIN value is
sufficient to achieve an amplitude of about 400mV on pin RO the
current of the reference oscillator core will be set to ROMIN.
Otherwise the current will be permanently regulated between
ROMAX and ROMIN. If ROMIN and ROMAX are equal no
regulation of the oscillator current occurs. Please also note the
block description of the reference oscillator in para. 3.1.1
Set the start-up current of the reference oscillator
ROMAX
[15:13]
000
001
010
011
100
101
110
111
0 μ A
75 μ A
150 μ A
225 μ A
300 μ A
375 μ A
450 μ A
525 μ A #default
Set the start-up current of the reference oscillator core. Please
also note the description of the ROMIN register and the block
description of the reference oscillator which can be seen above.
OA2 operation
OA2
[16]
0
1
disabled
enabled
#default
OA2 can be enabled in FSK receive mode. OA2 is disabled in ASK mode receive.
Internal AFC feature
AFC
[17]
0
1
disabled
enabled
#default
Hysteresis on pin GAIN_LNA
LNAHYST
[18]
0
1
disabled
enabled - typical 340 mV (V 0 → 1 = 1.56V, V 1 → 0 = 1.22V)
#default
Delayed start of the PLL
0
undelayed start
PLL starts at the reference oscillator start-up
DELPLL
[19]
1
starts after 8 valid RO-cycles
#default
PLL starts after 8 valid RO-cycles before entering an active mode to ensure reliable oscillation
of the reference oscillator.
not used
[20]
set to ‘1’ for correct function
RSSI Peak Detector
0
disabled
#default
PKDET
[21]
1
The RSSI output signal directly feeds the data slicer setup by means of OA1.
enabled
In ASK receive mode the RSSI Peak Detector output is multiplexed to pin INT2/PDO.
39012 07122 02
Rev. 006
Page 10 of 24
EVB Description
June/08
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