RF6001_1 RFMD [RF Micro Devices], RF6001_1 Datasheet - Page 25

• Manufacturer Part Number: RF6001_1
• Description: FRACTIONAL-N RF SYNTHESIZER WITH MODULATOR AND DIGITAL IF FILTER
• Manufacturer: RFMD [RF Micro Devices]

All of the above diagrams assumed that RXCKB=RXFSB=0. The diagram below presents an example with RXCKB=1 and
RXFSB=0. This is an external (baseband) clock with the FSR sync generated by the RF6001.
Note that the FSR pulse is located at the MSB of the I word, and that there will be two CLKR pulses output before FSR rises.
The same diagram will hold true with RXFSB=1 except in this case the sync is an input coming from the baseband part and the
baseband must provide at least two CLKR pulses before asserting FSR.
If FS_LOC=1 then the sync pulse is advanced by one clock cycle as shown below.
DC Offset Correction
Fast Fine DC Adapt (FFDA)
The digital filters in the RF6001 perform a “fast fine DC adapt” (FFDA) which normally continues for about 50usec beyond the
end of the CDCA (coarse DC adapt on RF2716/2722), and results in a DC error of less than 80uV at the baseband interface.
The FFDA is triggered by the RX_EN pin on the RF6001, which is normally exerted at the same time as the RX_EN of the
RF2716/2722. This means that the FFDA runs during the CDCA as well, but has little effect during that time. The total time that
the FFDA operates is set by RF6001 SDI fields DCAD and DCAD_2. During FFDA, the clock rate to the DC correction system is
13MHz.
The automatic operation of the FFDA can be disabled by programming SDI bits ADEN=0 and ADEN_2=0. Please note that,
unlike with the CDCA in the RF2716/2722, there is no way to activate the FFDA in the RF6001 other than to assert a rising
edge on RX_EN.
Rev A3 DS050929
CLKR
CLKR
DRQ
ENR
FSR
DRQ
DRI
ENR
FSR
DRI
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support, contact RFMD at ([phone] or [e-mail].
1
I(15)
2
1
I(14)
I(15)
3
2
15
15
I(1)
I(1)
RXCKB=1, FS_LOC=0
RXCKB=1, FS_LOC=1
16
RX_MODE=010
16
RX_MODE=010
I(0)
I(0)
17
17
Q(15)
Q(15)
18
18
Q(14)
Q(14)
Part of the POLARIS™ TOTAL RADIO™ Solution
19
19
29
29
Q(1)
Q(1)
30
30
Q(1)
Q(1)
31
31
Q(1)
Q(1)
32
32
RF6001
Q(0)
Q(0)
1
1
I(15)
I(15)
2
2
I(14)
I(14)
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