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IDT5V993-7Q Datasheet(PDF) 3 Page - Integrated Device Technology |
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IDT5V993-7Q Datasheet(HTML) 3 Page - Integrated Device Technology |
3 / 8 page 3 COMMERCIALANDINDUSTRIALTEMPERATURERANGES IDT5V993A 3.3V PROGRAMMABLE SKEW PLL CLOCK DRIVER TURBOCLOCK EXTERNALFEEDBACK By providing external feedback, the IDT5V993A gives users flexibility with regard to skew adjustment. The FB signal is compared with the input REF signal at the phase detector in order to drive the VCO. Phase differences cause the VCO of the PLL to adjust upwards or downwards accordingly. NOTES: 1. The device may be operated outside recommended frequency ranges without damage, but functional operation is not guaranteed. Selecting the appropriate FS value based on input frequency range allows the PLL to operate in its ‘sweet spot’ where jitter is lowest. 2. The level to be set on FS is determined by the nominal operating frequency of the VCO and Time Unit Generator. The VCO frequency always appears at 1Q1:0, 2Q1:0, and the higher outputs when they are operated in their undivided modes. The frequency appearing at the REF and FB inputs will be the same as the VCO when the output connected to FB is undivided. The frequency of the REF and FB inputs will be 1/2 or 1/4 the VCO frequency when the part is configured for a frequency multiplication by using a divided output as the FB input. 3. Skew adjustment range assumes that a zero skew output is used for feedback. If a skewed Q output is used for feedback, then adjustment range will be greater. For example if a 4tU skewed output is used for feedback, all other outputs will be skewed –4tU in addition to whatever skew value is programmed for those outputs. ‘Max adjustment’ range applies to output pairs 3 and 4 where ± 6tU skew adjustment is possible and at the lowest FNOM value. An internal loop filter moderates the response of the VCO to the phase detector. The loop filter transfer function has been chosen to provide minimal jitter (or frequency variation) while still providing accu- rate responses to input frequency changes. FS = LOW FS = MID FS = HIGH Comments Timing Unit Calculation (tU) 1/(44 x FNOM) 1/(26 x FNOM) 1/(16 x FNOM) VCO Frequency Range (FNOM)(1,2) 15 to 35MHz 25 to 60MHz 40 to 85 MHz Skew Adjustment Range(3) Max Adjustment: ±9.09ns ±9.23ns ±9.38ns ns ±49° ±83° ±135° Phase Degrees ±14% ±23% ±37% % of Cycle Time Example 1, FNOM = 15MHz tU = 1.52ns — — Example 2, FNOM = 25MHz tU = 0.91ns tU = 1.54ns — Example 3, FNOM = 30MHz tU = 0.76ns tU = 1.28ns — Example 4, FNOM = 40MHz — tU = 0.96ns tU = 1.56ns Example 5, FNOM = 50MHz — tU = 0.77ns tU = 1.25ns Example 6, FNOM = 80MHz — — tU = 0.78ns PLL PROGRAMMABLE SKEW RANGE AND RESOLUTION TABLE CONTROL SUMMARY TABLE FOR FEEDBACK SIGNALS nF1:0 Skew (Pair #1, #2) Skew (Pair #3) LL(1) –4tU Divide by 2 LM –3tU –6tU LH –2tU –4tU ML –1tU –2tU M M Zero Skew Zero Skew MH 1tU 2tU HL 2tU 4tU HM 3tU 6tU HH 4tU Divide by 4 NOTE: 1. LL disables outputs if TEST = MID and GND/ sOE = HIGH. |
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