FS8170 Princeton Technology Corp., FS8170 Datasheet
FS8170
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FS8170 Summary of contents
Page 1
... Description The FS8170 serial data input, fully programmable phase-locked loop with a 2.5 GHz prescaler for use in the local oscillator subsystem of radio transceivers. Multi-modu- lus division ratios of 32/33 and 64/65 are selectable thru serial programming to enable pulse swallowing operation ...
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... Phase comparator CMOS inverter output for an external charge pump Functional Block Diagram FIN N-PRESCALER XFIN DATA CONTROL CLK LOGIC LE EN XIN OSC XOUT Description N-COUNTER N-LATCH CHARGE SHIFT REGISTER PFD R-LATCH LOCK LD MUX DETECTOR R-COUNTER Page 2 FS8170 φR φP DO PUMP ZC FOLD July 2005 ...
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... Recommended Operating Conditions Parameter Supply voltage range Operating temperature Symbol Rating Unit V V – – 0 0.5 V FIN –55 to 125 °C STG T 260 °C SLD SLD 3500 eV Value Symbol Unit min. typ. max. V 2.4 3.0 3 Vcc – 5 – °C A Page 3 FS8170 July 2005 ...
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... V IH,XIN IL,XIN IL V Open drain output OL I Open drain output 3 – Page 4 FS8170 Value Unit min. typ. max µ 2500 MHz 3 40 MHz dBm - 0.5 CC pk- -1 0.8× 0.2×V CC µA –1 1 µA –1 1 µA 100 µA – ...
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... MICROWIRE TIMING DATA to CLK setup time t DATA to CLK hold time CLK to LE setup time t CLK to LE hold time LE Pulse width Condition 3 – SU1 HOLD1 t SU2 HOLD2 t EW Page 5 FS8170 Value Unit min. typ. max. V – 0.4 0.4 V – July 2005 ...
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... Also, serial input data timing waveforms are shown in Fig The programmable input fre × × × + – for the ÷ 32/33 prescaler mode, and is 992 for the ÷ 32/33 mode and . The programmable reference frequency divider con- R Page 6 FS8170 , = for N 4032 to 131135 July 2005 ...
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... Control bit for setting the polarity of the phase/frequency detector LDS Control bit for selecting the output for the FOLD pin CS Control bit for setting the charge pump current level t HOLD1 t SU2 Min. Typ. Max. Unit 10 – – – – – – Page 7 FS8170 2 1 MSB July 2005 ...
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... Table 4: Binary 14-bit data format for reference counter Divide ratio ( 16383 Table 5: Data format for 3 optional bits Bit 32/33 64/ 1.5 mA LDS FO signal LD signal Description Prescaler dual-modulus ratio setting Charge pump current setting FOLD output select setting Page 8 FS8170 July 2005 ...
Page 9
... The DO output is intended for use with VCO V (b) VCO frequency-voltage characteristic Note: If VCO has a positive tuning curve similiar to trace (1), set FC = “H,” otherwise if the VCO has a negative tuning curve similar to trace (2), set FC = “L.” Page 9 FS8170 φP FOLD a Z FOLD = with an internal ...
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... Table 6. φP and φR are the error signals directly proportional to the positive/negative phase error when FC = “H.” When FC = “L,” the relation becomes negative/positive. Table 7: Setting for the pin MHz) XIN = 8 MHz) XIN Do Output Normal output High impedance Page 10 FS8170 July 2005 ...
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... PFD output is unpredictable and may give rise to a significant jump in the VCO’s frequency which will result in an increased lock-up time. To prevent this, the FS8170 employs an intermittent control circuit to limit the magnitude of the error signal generated by the phase detector when it returns to normal operation, thus ensuring a much quicker return to the fully phase-locked condition ...
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... The circuit shown in Fig used for measuring the input sensitivity of the FIN input of the PLL. Fig. 4 – FIN input sensitivity test circuit 1000pF 1000pF S.G. FIN XFIN 50Ω CLK DATA From Controller 0.1µF VSS DO VCC VP XOUT XIN φP φ FOLD Vcc To Counter Page 12 FS8170 1000pF S.G. 50Ω July 2005 ...
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... SPEC Vcc=2.4V Vcc=3.0V Vcc=3.6V 0.8 1.0 1.2 1.4 1.6 1.8 2.0 FIN (GHz) SPEC Vcc=2.4V Vcc=3.0V Vcc=3.6V 0.8 1.0 1.2 1.4 1.6 1.8 2.0 FIN (GHz) Page 13 FS8170 2.2 2.4 2.6 2.2 2.4 2.6 July 2005 ...
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... XIN Input Sensitivity Fig. 6 – XIN input sensitivity vs. frequency 10 5 SPEC 0 -5 -10 -15 -20 -25 -30 - XIN Input Sensitivity Vcc=2.4V Vcc=3.0V Vcc=3.6V 100 150 200 XIN (MHz) Page 14 FS8170 250 July 2005 ...
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... High Current Mode (Ido=6mA Source State : 0.0 0.5 DO Low Current Mode (Ido=1.5mA) > Positive R V Sink State : F > Negative R V 1.0 1.5 2.0 2.5 Vdo (V) > Positive R V Sink State : F > Negative R V 1.0 1.5 2.0 2.5 Vdo (V) Page 15 FS8170 3.0 3.0 July 2005 ...
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... Low Current Mode (1.5mA mode) P Sink Current Source Current 2.8 3.0 3.2 3.4 3.6 3.8 V (V) P High Current Mode (6.0mA mode) P Sink Current Source Current 2.8 3.0 3.2 3.4 3.6 3.8 V (V) P Page 16 FS8170 = 4.0 4.2 4.0 4.2 July 2005 ...
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... Appication Circuit 33pF Xtal 33pF VP VCC 0.1µF 1µF 1000pF VCO φR XIN φP XOUT VP FOLD VCC VSS LE 1000pF XFIN DATA FIN CLK Page 17 FS8170 VP 10K 12K 12K 10K Lock Detect July 2005 ...