307GI-03LF IDT, 307GI-03LF Datasheet - Page 9

• Manufacturer Part Number: 307GI-03LF
• Description: Clock Drivers & Distribution SERIAL PROGRAMMABLE CLOCK SOURCE
• Manufacturer: IDT

Specifications of 307GI-03LF

• Rohs: yes
• Max Output Freq: 270 MHz
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 3 V
• Maximum Operating Temperature: + 70 C
• Package / Case: TSSOP-16
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Supply Current: 24 mA
• Part # Aliases: ICS307GI-03LF

Setting the PLL Loop Response
The PLL loop response is determined both by fixed device
characteristics and by other characterizes set by the user.
This includes the values of R
Components figure on this page.
The PLL loop bandwidth is approximated by:
The above equation calculates the “normalized” loop
bandwidth (denoted as “NBW”) which is approximately
equal to the - 3dB bandwidth. NBW does not take into
account the effects of damping factor or the second pole
imposed by C
approximation of filter performance.
Default Register Values
At power-up, the registers are set to:
ref divide = 5
VCO divide = 50
output divide = 10 (CLK1)
output divide = 2 (CLK2)
output divide = 2 (CLK3)
bit 123, 124 = 1
ICP = 3.75 µA
R = 16k
Default programming word is:
0x31FFDFFEE3BFFFFFFFFFFFFFFFF055FF2
IDT® SERIALLY PROGRAMMABLE CLOCK SOURCE
ICS307-03
SERIALLY PROGRAMMABLE CLOCK SOURCE
Where:
R
I
K
FV Divider = 12 to 2055
CP
O
S
= Value of resistor R
= VCO Gain in Hz/V
= Charge pump current in amps
NBW(PLL)
P
. It does, however, provide a useful
=
----------------------------------------- -
2
R
S
S
and C
S
FV Divider
I
in loop filter in Ohms
CP
S
as shown in the PLL
K
O
9
To prevent jitter due to modulation of the PLL by the phase
detector frequency, the following general rule should be
observed:
.
NBW(VCO PLL)
The PLL loop damping factor is determined by:
DF(VCLK)
Where:
C
S
= Value of capacitor C
= 300e
=
f(Phase Detector)
-------------------------------------- -
-12
R
----- -
2
S
in Farads
SER PROG CLOCK SYNTHESIZER
I
----------------------------------- -
10
CP
FV Divider
C
S
S
ICS307-03
in loop filter in Farads
K
O
REV L 032911