RF6001_1 Datasheet, PDF (52/70 Pages) RF Micro Devices – FRACTIONAL-N RF SYNTHESIZER WITH MODULATOR AND DIGITAL IF FILTER

RF6001
Part of the POLARIS™ TOTAL RADIO™ Solution
RF6001
Loop
Filters
28
VCO2
27
VCO1
26
VCO
VREG
25
21
22
23
24
13
To
RF3146
12
RF2722
18
17
27 pF 47 pF
General Purpose Output Control
The RF6001 provides three general purpose output pins, GPO1, GPO2, and GPO3; a timing control unit is implemented within
the RF6001. This timing control is identical to that in the RF2722 for the GPO’s with added GPO control in TX modes. The tim-
ing controls are set by the DCTIME2 (11:0) and TRD bits in the TRSW register. The GPO values used during the startup of RX or
TX bursts are defined by the TRDCRX (2:0) and TRDCTX (2:0) bits in the CFG3 register. This allows the RF6001 to control the
TX/RX switch to provide more isolation during DC offset correction in RX mode, or to provide more isolation for the PA output
power before ramping up in TX mode.
Power Supplies and Control Signals
The RF6001 has four primary supply pins: V_DD, V_CC, V_CCV, and V_DDRX. These pins require a 2.7V to 3.0V supply, usually from a
voltage regulator on the application circuit board. These four supply pins must be maintained within 0.3V of each other. That
is, all four supplies should be power up or down together. The part is not designed to allow one supply to be at 2.7V to 3V with
the others at 0V.
The recommended start-up and power-on sequence for the RF6001 is described below.
1) Power-down: all power supplies and enable lines are low (OSCM, RXEN, TXST, TXEN).
2) Standby Mode: Board regulators to V_DD, V_CC, V_CCV, and V_DDRX are enabled. All enable lines are low. The internal digital volt-
age regulator (between V_DD and DCD) requires approximately 50us to settle, triggering the internal power-on reset (POR) cir-
cuit. It is recommended that the baseband processor send a RESET op-code to the RF6001 at this point, as well.
3)Idle Mode: The reference oscillator input circuits and output buffer (OSCO) are enabled by setting the OSCM pin high. The
oscillator input and output circuits require up to 1ms to settle.
4) Active Mode (either Receive or Transmit): The required Receive or Transmit signal path and PLL/VCO circuits are enabled by
the RXEN or TXST pin, respectively.
52 of 70
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
Rev A3 DS050929