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PDF 841N4830 Data sheet ( Hoja de datos )
| Número de pieza | 841N4830 | |
| Descripción | NG Crystal-To-HCSL Frequency Synthesizer | |
| Fabricantes | Integrated Device Technology | |
| Logotipo |  |
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FemtoClock® NG Crystal-To-HCSL
Frequency Synthesizer
841N4830
DATA SHEET
General Description
The 841N4830 is a 3 HCSL, 1 LVPECL and 2 LVCMOS output
Synthesizer optimized to generate PCI Express reference clock
frequencies. The device uses IDT’s fourth generation FemtoClock®
NG technology for synthesis of high clock frequency at very low
phase noise. It provides low power consumption with good power
supply noise rejection. Using a 25MHz, 12pF parallel resonant
crystal, the following frequencies can be generated: 100MHz,
50MHz and 25MHz. Maximum rms phase jitter of 0.36ps, easily
meets PCI Express jitter requirements. The 841N4830 is packaged
in a small 32-pin VFQFN package.
Features
• Fourth generation FemtoClock® Next Generation (NG) technology
• Three differential HCSL outputs, one differential LVPECL and
two single-ended LVCMOS/LVTTL outputs
• Crystal oscillator interface designed for a 25MHz, 12pF parallel
resonant crystal
• CLK/nCLK input pair can accept the following differential input
levels: LVPECL, LVDS, HCSL
• A 25MHz crystal generates output frequencies of: 100MHz,
50MHz and 25MHz
• VCO frequency: 2GHz
• RMS Phase Jitter @ 100MHz, (12kHz – 20MHz) using a 25MHz
crystal: 0.36ps (maximum)
• Power supply noise rejection PSNR: -45dB (typical)
• PCI Express Gen 2 (5 Gb/s) jitter compliant
• Full 3.3V supply mode
• -40°C to 85°C ambient operating temperature
• Available in lead-free (RoHS 6) package
Block Diagram
nOE_REF Pulldown
PLL_BYPASS Pulldown
nOEA Pulldown
XTAL_IN
XTAL_OUT
CLK Pulldown
nCLK Pullup
CLK_SEL Pullup
25MHz
OSC
0
1
IREF
DIV2_QB Pullup
nOEB Pulldown
PFD
&
LPF
FemtoClock® NG
VCO
2GHz
1
÷20
0
÷1 0
÷80 ÷2 1
Pin Assignment
25MHz LVPECL
REF_OUT
nREF_OUT
100MHz HCSL
3QA[2:0]
3
nQA[2:0]
100MHz LVCMOS
QA3
32 31 30 29 28 27 26 25
PLL_BYPASS 1
24 QA1
nOE_REF 2
841N4830
23 nQA1
nOEB 3
32-Lead VFQFN
22 VDDO
DIV2_QB 4 5mm x 5mm x 0.925mm 21 QA2
VDDA 5
package body
20 nQA2
CLK 6
nCLK 7
K Package
Top View
19 GND
18 QA3
VDDO_REF 8
17 VDDO_QA3
9 10 11 12 13 14 15 16
100/50MHz
LVCMOS
QB
841N4830 Rev E 7/1/15
1 ©2015 Integrated Device Technology, Inc.
1 page  
841N4830 DATA SHEET
Table 4C. Differential DC Characteristics, VDD = 3.0V to 3.6V, TA = -40°C to 85°C
Symbol Parameter
Test Conditions
Minimum
IIH
IIL
VPP
VCMR
Input High
Current
CLK
nCLK
Input Low
Current
CLK
nCLK
Peak-to-Peak Voltage; NOTE 1
Common Mode Input Voltage;
NOTE 1, 2
VDD = VIN = 3.6V
VDD = VIN = 3.6V
VDD = 3.6V, VIN = 0V
VDD = 3.6V, VIN = 0V
-5
-150
0.15
GND + 0.5
NOTE 1: VIL should not be less than -0.3V.
NOTE 2: Common mode input voltage is defined as VIH.
Typical
Maximum
150
5
1.3
Units
µA
µA
µA
µA
V
VDD – 0.85
V
Table 4D. LVPECL DC Characteristics, VDDO_REF = 2.7V to 3.6V, VEE = 0V, TA = -40°C to 85°C
Symbol Parameter
Test Conditions
Minimum
Typical
VOH
VOL
VSWING
Output High Voltage; NOTE 1
Output Low Voltage; NOTE 1
Peak-to-Peak Output Voltage Swing
VDDO_REF – 1.4
VDDO_REF – 2.0
0.6
NOTE 1: Output termination with 50 to VDDO_REF – 2V.
Maximum
VDDO _REF – 0.9
VDDO_REF – 1.7
1.0
Units
V
V
V
Table 5. Crystal Characteristics
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
Test Conditions
Minimum
Typical
Fundamental
25
Maximum
50
7
Units
MHz
pF
Rev E 7/1/15
5 FEMTOCLOCK® NG CRYSTAL-TO-HCSL FREQUENCY SYNTHESIZER
5 Page 
Parameter Measurement Information, continued
841N4830 DATA SHEET
Differential Measurement Points for Duty Cycle/Period
Single-ended Measurement Points for Delta Cross Point
Differential Measurement Points for Rise/Fall Edge Rate
Single-ended Measurement Points for Absolute Cross
Point/Swing
+150mV
VRB = +100mV
0.0V
VRB = -100mV
-150mV
Q - nQ
TSTABLE
VRB
TSTABLE
VRB
Differential Measurement Points for Ringback
Rev E 7/1/15
11 FEMTOCLOCK® NG CRYSTAL-TO-HCSL FREQUENCY SYNTHESIZER
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet 841N4830.PDF ] | |
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