
Micrel, Inc.
1000
950
900
850
800
Tuning range
'10'
'11'
MICRF600/MICRF600Z
0
0,5
1
1,5
2
2,5
Varactor voltage (V)
Figure 6. RF Frequency vs. Varactor Voltage
and VCO Frequency bit (V DD = 2.25V)
Lock Detect
A6..A0
0000001
D7
‘1’
D6
‘0’
D5
‘0’
D4
‘0’
D3
RSSI_en
D2
LD_en
D1
PF_FC1
D0
PF_FC0
A lock detector can be enabled by setting LD_en = 1.
When pin LD is high, it indicates that the PLL is in lock.
When entering TX, the procedure is first to load the TX
word and then turn on the PA stage. During the PA ramp
up time, the LD signal may indicate out of lock. It is first
when the PA stage is fully on that the LD signal will
indicate in “Lock”. During transmission, the Lock Detect
signal will have transitions and the user should therefore,
ignore the Lock detect signal.
Modes of Operation
A6..A0
0000000
D7
LNA_by
D6
PA2
D5
PA1
D4
PA0
D3
Sync_en
D2
Mode1
D1
Mode0
D0
’1’
Mode1
0
0
1
1
July 2006
Mode0
0
1
0
1
State
Power down
Standby
Receive
Transmit
Comments
Keeps register configuration
Only crystal oscillator running
Full receive
Full transmit ex PA state
13
M9999-082505