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CSPT857CPAG8

P1-P3P4-P6P7-P9P10-P12P13-P15
10
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
IDTCSPT857C
2.5V - 2.6V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER
TEST CIRCUIT AND SWITCHING WAVEFORMS
Figure 1. Output Load
VDD
CSPT857C
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
CSPT857C
V
DDQ/2
VDDQ/2
Figure 2. Output Load Test Circuit
11
IDTCSPT857C
2.5V - 2.6V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
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 AND INDUSTRIAL TEMPERATURE RANGES
IDTCSPT857C
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

CSPT857CPAG8

Mfr. #:
Buy CSPT857CPAG8
Manufacturer:
IDT
Description:
Clock Drivers & Distribution 2.5V DDR CLK DRIVER
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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