RF6001_1 RFMD [RF Micro Devices], RF6001_1 Datasheet - Page 31

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

GMSK Modulation Interface
The GMSK modulation interface can be configured to accept analog I/Q inputs or digital data bits with or without differential
encoding. This interface multiplexes some of the same pins for analog and digital modes, and consists of the following: TXI
analog input (TXI), TXIB analog input or Modulation Sync input/output (TXIB/MS), TXQ analog input or Modulation Data Input
(TXQ/MDI), TXQB analog input or Modulation Clock input/output (TXQB/MCK), Transmit Enable (TXEN), and Transmit Start
(TXST). The SDI bit TXAD defines the state of the interface, if programmed false it will operate in analog mode and programmed
true will operate in digital mode. If digital mode is selected, the TXI input is disabled. The diagram below documents the GMSK
modulation interface to the fractional synthesizer, showing all programmable SDI bits necessary for setup.
The GMSK modulator block diagrams block performs the necessary pulse shaping to the decoded data bits in order to achieve
GMSK modulation. Since this is done in the digital domain, there is a delay associated with this block of approximately 14.1μs.
The I and Q transmit data should be sent early relative to the start of the burst to account for this delay.
Input analog or digital data may be differentially encoded in the RF6001 before the modulator. By setting the SDI bit TX_DE
high (1), input data is differentially encoded by the RF6001. In addition, the initial state of the internal differential encoder may
be selected with the DE_INIT bit. If the data has already been differentially encoded by the baseband, set the TX_DE bit low (0).
Transmit Modulation Interface
Rev A3 DS050929
PAR10
PAR11
PAR12
PAR13
PAR14
PAR15
PAR0
PAR1
PAR2
PAR3
PAR4
PAR5
PAR6
PAR7
PAR8
PAR9
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
000h
000h
029h
0CDh
128h
183h
23Ch
299h
349h
393h
3CDh
076h
1DFh
2F4h
3F2h
3FFh
000h
000h
000h
000h
30Bh
360h
3D6h
051h
0C2h
13Fh
1BEh
237h
2A8h
3A4h
3F4h
3FFh
Part of the POLARIS™ TOTAL RADIO™ Solution
RF6001
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