RF6001_1 Datasheet, PDF (23/70 Pages) RF Micro Devices – FRACTIONAL-N RF SYNTHESIZER WITH MODULATOR AND DIGITAL IF FILTER

RF6001
Part of the POLARIS™ TOTAL RADIO™ Solution
RXMODE=100, DBL=1
In this mode the SSI provides two samples of I and two samples of Q for each GSM symbol period. The output data pattern on
DRI is 16 bits of I data followed by 16 bits of Q data followed by 16 blank bits. In this case FSR is (13/24)MHz=541.667kbps
and CLKR is 26MHz.
The various CLKR modes are defined as follows: with CLKRM=00 and RXCKB=0, CLKR will shut down after the Q data transfer
completes until the next I data transfer to save power; with CLKRM=01 and RXCKB=0, CLKR is always enabled if ENR is true;
with CLKRM=1x, CLKR is always disabled.
The following diagram summarizes this mode of operation.
Tcs
Tcwh
Tcwl
ENR
CLKR
CLKRM=00
1
2
3
15
16
17
18
19
31
32
33
34
48
1
2
CLKR
CLKRM=01
FSR
DRI
DRQ
I(15) I(14)
Tsu
I(1)
I(0)
Th
Q(15) Q(14)
Q(1)
Q(0)
I(15)
I(14)
RXMODE = 101
(Valid only for CHBW greater than or equal to 90kHz in 100kHz VLIF or DCR mode.)
In this mode the SSI provides four samples of I and four samples of Q for each GSM symbol period. The output data pattern on
DRI is 12 bits of I data followed by 12 bits of Q data. In this case FSR is (13/12)MHz=1083.333kbps and CLKR is 26MHz.
The various CLKR modes are defined as follows: with CLKRM=00 and RXCKB=0, CLKR will shut down after the Q data transfer
completes until the next I data transfer to save power (with RXMODE=101, CLKR will always be enabled as there is no blank
data); with CLKRM=01 and RXCKB=0, CLKR is always enabled if ENR is true; with CLKRM=1x, CLKR is always disabled.
DBL will have no effect in this mode.
The following diagram summarizes this mode of operation.
ENR
CLKR,
CLKRM=00 or 01
1
2
3
11
12
13
14
15
23
24
1
2
FSR
DRI
I(11)
I(10)
I(1)
I(0)
Q(11)
Q(10)
Q(1)
Q(0)
I(11)
I(10)
DRQ
Rev A3 DS050929
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