ICS601G-01ILFT IDT, Integrated Device Technology Inc, ICS601G-01ILFT Datasheet - Page 3

• Manufacturer Part Number: ICS601G-01ILFT
• Description: IC CLOCK MULTIPLIER 16-TSSOP
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock/Frequency Synthesizerr

Specifications of ICS601G-01ILFT

• Pll: Yes with Bypass
• Input: Clock, Crystal
• Output: CMOS
• Number Of Circuits: 1
• Ratio - Input:output: 2:2
• Differential - Input:output: No/No
• Frequency - Max: 156MHz
• Divider/multiplier: No/Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Frequency-max: 156MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 601G-01ILFT

Achieving Low Phase Noise
External Component/Crystal Selection
IDT™ / ICS™ LOW PHASE NOISE CLOCK MULTIPLIER
ICS601-01
LOW PHASE NOISE CLOCK MULTIPLIER
Figure 1 shows a typical phase noise measurement in a 125 MHz system. Therea are a few simple steps that can
be taken to achieve these levels of phase noise from the ICS601-01. Variations in VDD will increase the hase noise,
so it is important to have a stable, low noise supply voltage at the device. Use decoupling capacitors of 0.1 F in
parallel with 0.01 F. It is important to have these capacitors as close as possible to the ICS601-01 supply pins.
Disabling the REFOUT clock is also important for achieving low phase noise; lab tests have shown that this can
reduce the phase noise by as much as 10 dBc/Hz.
The ICS601-01 requires a minimum number of external components for proper operation. Decoupling capacitors of
0.01 F and 0.1 F should be connected between VDD and GND, as close to the part as possible. A series
termination resistor of 33 may be used for each clock output. The crystal must be connected as close to the chip
as possible. The crystal should be fundamental mode, parallel resonant. Do not use third overtone. For exact tuning
when using a crystal, capacitors should beconnected from pins X1 to ground and X2 to ground. In general, the
value of these capacitors is given by the following equation, where CL is the crystal load capacitance: Crystal caps
(pF) = (CL - 5) x 2. So for a crystal with 16 pF load capacitance, two 22 pF caps can be used. For any given board
layout, ICS can measure the board capacitance and recommend the exact capacitance value to use.
-100
-120
-140
-20
-40
-60
-80
1.00E +01
0
1.00E +02
Figure 1. Phase N oise of ICS601-01 for 125 M H z output, 25 M Hz crystal input.
1.00E +03
VD D = 3.3 V, R EFO U T disabled.
O ffset from C arrier (H z)
1.00E +04
3
1.00E +05
1.00E +06
1.00E+07
ICS601-01
CLOCK MULTIPLIER
REV N 051310