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CSPT857DBVG

P1-P3P4-P6P7-P9P10-P12P13-P15
10
COMMERCIAL TEMPERATURE RANGE
IDTCSPT857D
2.5V - 2.6V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER
TEST CIRCUIT AND SWITCHING WAVEFORMS
Figure 1. Output Load
VDD
CSPT857D
VSS
R = 120Ω
Z = 60Ω
Z = 60Ω
C = 14pF
C = 14pF
VSS
VSS
VDDQ/2
VDDQ/2
R = 10Ω
Z = 60Ω
Z = 60Ω
C = 14pF
C = 14pF
Z = 50Ω
Z = 50Ω
R = 50Ω
R = 50Ω
0V
0V
R = 10Ω
SCOPE
CSPT857D
V
DDQ/2
VDDQ/2
Figure 2. Output Load Test Circuit
11
IDTCSPT857D
2.5V - 2.6V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER
COMMERCIAL TEMPERATURE RANGE
Yx, FBOUT
tjit(cc) tcycle n tcycle n+1
=
Yx, FBOUT
tcycle n tcycle n+1
FBIN
CLK
t(Ø)n
t(Ø)n + 1
t(Ø)
=
N
n = N
1
t(Ø)n
∑
CLK
FBIN
(N is a large number of samples)
Figure 3. Cycle-to-Cycle jitter
Figure 4. Static Phase Offset
Yx, FBOUT
Yx
tsk(o)
Yx, FBOUT
Yx
Figure 5. Output Skew
TEST CIRCUIT AND SWITCHING WAVEFORMS
12
COMMERCIAL TEMPERATURE RANGE
IDTCSPT857D
2.5V - 2.6V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER
Yx, FBOUT
Yx, FBOUT
tjit(per)
=
tcycle n
1
f
o
Yx, FBOUT
Yx, FBOUT
tcycle n
1
f
o
Yx, FBOUT
Yx, FBOUT
1
f
o
tjit(hper)
=
thalf period n
1
2*f
o
Yx, FBOUT
Yx, FBOUT
thalf period n
thalf period n+1
Figure 6. Period jitter
Figure 7. Half-Period jitter
TEST CIRCUIT AND SWITCHING WAVEFORMS
P1-P3P4-P6P7-P9P10-P12P13-P15

CSPT857DBVG

Mfr. #:
Buy CSPT857DBVG
Manufacturer:
IDT
Description:
Clock Drivers & Distribution 2.5V PLL Differ 1:10 DDR 1 Clock Driver
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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