TRF6900
SINGLE-CHIP RF TRANSCEIVER
SLAS213C – SEPTEMBER 1999 – REVISED MAY 2000
PRINCIPLES OF OPERATION
A–Word (Programming of DDS_0)
MSB
LSB
23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
0
0
DDS Frequency Setting for Mode0 (DDS_0 [21:0])
ADDR
B–Word (Programming of DDS_1)
MSB
LSB
0
23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
1
DDS Frequency Setting for Mode1 (DDS_1 [21:0])
ADDR
C–Word ( Control Register for PLL, Data Slicer and Mode1 Settings)
MSB
LSB
0
23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
X
X
PLL
Mode1 Control Register [12:0]
1
0
1
PA
APLL
LNAM
NPLL MM SLCTL
PLL VCO
SLC LPF SW RSSI LIM IF MIX
P1 P0
L1 L0
A2 A1 A0
ADDR
D–Word (Control Register for Modulation and Mode0 Settings)
MSB
LSB
23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Modulation Register [20:13]
Mode0 Control Register [12:0]
1
1
0
PA
LNAM
DEV
PLL VCO
SLC LPF SW RSSI LIM IF MIX
DV7 DV6 DV5 DV4 DV3 DV2 DV1 DV0
P1 P0
L1 L0
ADDR
NOTE: Start programming with MSB and ensure that the CLOCK and DATA lines are low during the rising edge of the strobe signal.
Figure 24. Serial Control Word Format
23
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