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IDT5991A-7JI Datasheet(PDF) 3 Page - Integrated Device Technology

Part # IDT5991A-7JI
Description  PROGRAMMABLE SKEW PLL CLOCK DRIVER TURBOCLOCK
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

IDT5991A-7JI Datasheet(HTML) 3 Page - Integrated Device Technology

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COMMERCIALANDINDUSTRIALTEMPERATURERANGES
IDT5991A
PROGRAMMABLESKEWPLLCLOCKDRIVERTURBOCLOCK
FS = LOW
FS = MID
FS = HIGH
Comments
TimingUnitCalculation(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 100MHz
SkewAdjustmentRange(3)
Max Adjustment:
±9.09ns
±9.23ns
±9.38ns
ns
±49º
±83º
±135º
PhaseDegrees
±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)
Skew (Pair #4)
LL(1)
–4tU
Divide by 2
Divide by 2
LM
–3tU
–6tU
–6tU
LH
–2tU
–4tU
–4tU
ML
–1tU
–2tU
–2tU
M M
Zero Skew
Zero Skew
Zero Skew
MH
1tU
2tU
2tU
HL
2tU
4tU
4tU
HM
3tU
6tU
6tU
HH
4tU
Divide by 4
Inverted(2)
NOTES:
1. LL disables outputs if TEST = MID and GND/sOE = HIGH.
2. When pair #4 is set to HH (inverted), GND/sOE disables pair #4 HIGH when VCCQ/PE = HIGH, GND/sOE disables pair #4 LOW when VCCQ/PE = LOW.
EXTERNALFEEDBACK
By providing external feedback, the IDT5991A 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.


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