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RFFC5062SR Datasheet(PDF) 9 Page - RF Micro Devices |
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RFFC5062SR Datasheet(HTML) 9 Page - RF Micro Devices |
9 / 25 page 9 of 25 RFFC5061/62 DS110614 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com. Multi-Slice Mode The Multi-Slice mode of operation allows up to four chips to be controlled from a common serial bus. The device address pins A0 and A1 are used to set the address of each part. On power up, and after a reset, the devices ignore the address pins (A1 and A2, pins 15 and 16) and any data presented to the serial bus will be programmed into all the devices. However, once the sipin bit in the SDI_CTRL register is set, each device then adopts an address according to the state of the address pins on the device. General Purpose Outputs The general purpose outputs (GPOs) can be controlled via the GPO register and will depend on the state of MODE since they can be set in different states corresponding to either mixer path 1 or 2. For example, the GPOs can be used to drive LEDs or to control external circuitry such as switches or low power LNAs. Each GPO pin can supply approximately 20mA load current. The output voltage of the GPO high state will drop with increased current drive by approximately 25mV/mA. Similarly the output voltage of the GPO low state will rise with increased current, again by approximately 25mV/mA. External Modulation The RFFC5061 and RFFC5062 fractional-N synthesizer can be used to modulate the frequency of the VCO. There are two ded- icated registers, EXT_MOD and FMOD, which can be used to configure the device as a modulator. It is possible to modulate the VCO in two ways: 1.Binary FSK The MODSETUP bits in the EXT_MOD register are set to 11. GPO3 is then configured as an input and used to control the signal frequency. The frequency deviation is set by the MODSTEP and MODULATION bits in the EXT_MOD and FMOD registers respec- tively. The modulation frequency is calculated according to the following formula: Where MODULATION is a 2's complement number and FPD is the phase detector frequency. 2.Continuous Modulation The MODSETUP bits in the EXT_MOD register are set to 01. The frequency deviation is set by the MODSTEP and MODULATION bits in the EXT_MOD and FMOD registers respectively. The VCO frequency is then changed by writing a new value into the MOD- ULATION bits, the VCO frequency is instantly updated. An arbitrary frequency modulation can then be performed dependant only on the rate at which values are written into the FMOD register. Slice2 (0) Slice2 (1) Slice2 (2) Slice2 (3) A1 A2 ENX SDATA SCLK Vdd Vdd Vdd Vdd A1 A2 A1 A2 A1 A2 FMOD 2 MODSTEP F PD MODULATION 2 16 = |
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