FD7550T-25.0M-PLE

FD7T Series Multi-Output CMOS Clock Oscillator May 2008 • Pletronics’ FD7T Series is a quartz crystal controlled precision square wave generator with multiple independent CMOS outputs • Output frequencies from 12 KHz to 230 MHZ • Selectable low jitter or spread spectrum outputs. • Device characteristics may be either factory or field programmable • 1.8V, 2.5 or 3.3V LVCMOS outputs • 5 x 7 mm LCC Ceramic Package • Low power • This is a low cost, mass produced oscillator. • Tape and Reel or cut tape packaging is available. • The package is designed for high density surface mount designs Model Number FD77xxT FD75xxT FD74xxT FD73xxT PLLs 4 3 2 1 Outputs 7 5 4 3 Pletronics Inc. certifies this device is in accordance with the RoHS 6/6 (2002/95/EC) and WEEE (2002/96/EC) directives. Pletronics Inc. guarantees the device does not contain the following: Cadmium, Hexavalent Chromium, Lead, Mercury, PBB’s, PBDE’s Weight of the Device: 0.17 grams Moisture Sensitivity Level: 1 As defined in J-STD-020C Second Level Interconnect code: e4 Absolute Maximum Ratings: Parameter VDD VDDOUT Vi Vo Io Input Voltage Output Voltage Continuous Output Current Unit -0.5V to +2.5V -0.5V to +4.6V -0.5V to VDD+ 0.5V -0.5V to VDDOUT + 0.5V _ 50 mA + 125oC 50oC/Watt Tj Maximum Junction Temperature Thermal Resistance, Junction to Case Product information is current as of publication date. The product conforms to specifications per the terms of the Pletronics standard warranty. Production processsing does not necessarily include testing of all parameters. Copyright © 2007, 2008, Pletronics Inc. FD7T Series Multi-Output CMOS Clock Oscillator May 2008 BLOCK DIAGRAMS OF THE FD7T SERIES FD73xxT Vdd 1.8V (1) Vddout (5) Reference oscillator optional Voltage controlled PLL Multiplier #1 optional Spread Spectrum optional Bypass Mode Vcontrol (2) MUX #1 Divider #1 /1 to /1023 Y1 (11) Out1 Divider #2 /1 to /127 Divider #3 /1 to /127 MUX #2 Y2 (10) Out2 S0 (14) Programming control eePROM SDA/SCL Registers S1/SDA (13) S2/SCL (12) MUX #3 Y3 (9) Out3 Ground (3) Sx Control FD74xxT Vdd 1.8V (1) Vddout (5) Reference oscillator optional Voltage controlled MUX #1 Divider #1 /1 to /1023 Y1 (11) Out1 Vcontrol (2) PLL Multiplier #1 optional Spread Spectrum optional Bypass Mode Divider #2 /1 to /127 Divider #3 /1 to /127 MUX #2 Y2 (10) Out2 S0 (14) Programming control eePROM SDA/SCL Registers PLL Multiplier #2 optional Spread Spectrum optional Bypass Mode MUX #3 Divider #4 /1 to /127 Divider #5 /1 to /127 MUX #4 Y3 (9) Out3 S1/SDA (13) S2/SCL (12) Y5 (4) Out4 Ground (3) Sx Control www.pletronics.com 425-776-1880 2 FD7T Series Multi-Output CMOS Clock Oscillator May 2008 FD75xxT Vdd 1.8V (1) MUX #1 Vddout (5) Reference oscillator optional Voltage controlled Divider #1 /1 to /1023 (11) Out1 Y1 Vcontrol (2) PLL Multiplier #1 optional Spread Spectrum optional Bypass Mode Divider #2 /1 to /127 Divider #3 /1 to /127 MUX #2 Y2 (10) Out2 MUX #3 S0 (14) Programming control eePROM SDA/SCL Registers Sx Control Ground (3) PLL Multiplier #3 optional Spread Spectrum optional Bypass Mode PLL Multiplier #2 optional Spread Spectrum optional Bypass Mode Divider #4 /1 to /127 Divider #5 /1 to /127 MUX #4 Y3 (9) Out3 S1/SDA (13) S2/SCL (12) Y5 (4) Out4 Divider #6 /1 to /127 Divider #7 /1 to /127 MUX #5 Y7 (8) Out5 FD77xxT (11) Out1 Vdd 1.8V (1) Vddout (5) PLL Multiplier #1 optional Spread Spectrum optional Bypass Mode Reference oscillator optional Voltage controlled MUX #1 Divider #1 /1 to /1023 Y1 Divider #2 /1 to /127 Divider #3 /1 to /127 MUX #2 Y2 (10) Out2 MUX #3 PLL Multiplier #2 optional Spread Spectrum optional Bypass Mode Divider #4 /1 to /127 Divider #5 /1 to /127 MUX #4 Y3 (9) Out3 Vcontrol (2) Y5 (4) Out4 S0 (14) Programming control eePROM SDA/SCL Registers Sx Control S1/SDA (13) S2/SCL (12) PLL Multiplier #3 optional Spread Spectrum optional Bypass Mode Divider #6 /1 to /127 Divider #7 /1 to /127 MUX #5 Y7 (8) Out5 MUX #6 PLL Multiplier #4 optional Spread Spectrum optional Bypass Mode Divider #8 /1 to /127 Divider #9 /1 to /127 MUX #7 Y8 (6) Out6 Ground (3) Y9 (7) Out7 www.pletronics.com 425-776-1880 3 FD7T Series Multi-Output CMOS Clock Oscillator May 2008 Description: The FD7T series Multi-Output CMOS Clock Oscillator is a modular PLL-based low cost, high-performance, programmable oscillator. The FD7T generates up to seven output frequencies, OUT1 through OUT7. Frequencies are mutually independent and may be programmed to any frequency from 100KHz to 230MHZ and one output can be as low as 12KHz. There are versions including 1 to 4 PLLs, the number of PLLs impacts the cost. The FD7T base frequency, as noted in the device part number, is established during manufacture and is permanently fixed. For convenience, the divider for output OUT1 and the remaining seven output frequencies, and their characteristics may be pre-programmed at the factory, or field programmed. The FD7T has a separate output supply pin, VDDOUT, for either 1.8, 2.5 or 3.3V output logic levels. The device supply, VDD which provides power to all the internal circuits, is nominally 1.8V. The FD7xxxTL version has increased output drive for then 1.8V output levels. This version can be used at 1.8V VDDOUT only. The deep M/N PLL divider ratio allows the generation of zero-ppm clocks for applications such as WLAN, BlueTooth, Ethernet, GPS, USB, IEEE1394, etc. from the base frequency. Each of the independent PLLs supports Spread Spectrum Clocking (SSC). SSC may be programmed to be either center-spread or down-spread. This is an important technique to reduce electro-magnetic interference (EMI). The device supports non-volatile eePROM programming for easy customization of the device. As shipped, the device is pre-programmed. Standard combinations are denoted by three characters in the device part number. However, the FD7T may be reprogrammed to a different configuration. Reprogramming may be either prior to assembly, or in-circuit via a 2-wire SDA/SCL I2C bus. Three programmable control inputs, S0, S1 and S2, may be used to control various aspects of FD7T operation including selection of alternative frequency set(s), selection of SSC functionality, output tri-state and power-down. Reference Oscillator The Reference Oscillator is an AT cut quartz crystal based oscillator. This oscillator is very similar to the Pletronics SM77xxH product oscillator. This signal is the lowest jitter and can be an output on Out1, Out2 or Out3 and can be divided down by the Divider #1. The user may specify any frequency between 12MHz and 32MHz for this reference. All output frequencies are derived from (referenced to) this Reference Oscillator. Reference Oscillator - VCXO The reference oscillator frequency can be modulated by the Vcontrol input, if the VCXO option is selected. As this Reference Signal is the reference for all other parts of this circuit, all PLLs will be modulated also. The VCXO input has a limited voltage range, the VCXO is associated with the internal 1.8V core. A resistor in series with the Vcontrol input will permit interfacing to 3.3V analog circuits, the voltage range that changes the frequency will still be limited but the larger voltages swings will not cause problems. www.pletronics.com 425-776-1880 4 FD7T Series Multi-Output CMOS Clock Oscillator May 2008 PLL Multipliers There are up to 4 each independent PLL Multipliers and these can multiply the Reference Oscillator frequency from 1 (bypass mode) to any value that is