8N3Q001EG-1033CDI IDT, 8N3Q001EG-1033CDI Datasheet - Page 4

• Manufacturer Part Number: 8N3Q001EG-1033CDI
• Description: Programmable Oscillators
• Manufacturer: IDT
• Series: IDT8Nr

Specifications of 8N3Q001EG-1033CDI

• Package / Case: 5 mm x 7 mm x 1.5 mm
• Frequency: 15.476 MHz to 866.67, 975 MHz to 1300 MHz
• Frequency Stability: +/- 50 PPM
• Supply Voltage: 3.63 V
• Load Capacitance: 10 pF
• Termination Style: SMD/SMT
• Output Format: LVPECL
• Minimum Operating Temperature: - 40 C
• Maximum Operating Temperature: + 85 C
• Dimensions: 7 mm W x 5 mm L x 1.5 mm H
• Product: VCXO
• Supply Voltage - Max: 3.465 V
• Supply Voltage - Min: 3.135 V
• Part # Aliases: IDT8N3Q001EG-1033CDI

IDT8N3Q001 REV G Data Sheet
Principles of Operation
The block diagram consists of the internal 3
oscillator which provide the reference clock f
MHz or 100MHz. The PLL includes the FemtoClock NG VCO along
with the Pre-divider (P), the feedback divider (M) and the post divider
(N). The P, M, and N dividers determine the output frequency based
on the f
operation. The feedback divider is fractional supporting a huge
number of output frequencies. The configuration of the feedback
divider to integer-only values results in an improved output phase
noise characteristics at the expense of the range of output
frequencies. In addition, internal registers are used to hold up to four
different factory pre-set P, M, and N configuration settings. These
default pre-sets are stored in the I
configuration is selected via the the FSEL[1:0] pins and can be read
back using the SCLK and SDATA pins.
The user may choose to operate the device at an output frequency
different than that set by the factory. After power-up, the user may
write new P, N and M settings into one or more of the four
configuration registers and then use the FSEL[1:0] pins to select the
newly programmed configuration. Note that the I
volatile and a power supply cycle will reload the pre-set factory
default conditions.
If the user does choose to write a different P, M, and N configuration,
it is recommended to write to a configuration which is not currently
selected by FSEL[1:0] and then change to that configuration after the
I
results in an immediate change of the output frequency to the
selected register values. The P, M, and N frequency configurations
support an output frequency range 15.476MHz to 866.67MHz and
975MHz to 1,300MHz.
The devices use the fractional feedback divider with a delta-sigma
modulator for noise shaping and robust frequency synthesis
capability. The relatively high reference frequency minimizes phase
noise generated by frequency multiplication and allows more efficient
shaping of noise by the delta-sigma modulator.
The output frequency is determined by the 2-bit pre-divider (P), the
feedback divider (M) and the 7-bit post divider (N). The feedback
divider (M) consists of both a 7-bit integer portion (MINT) and an
18-bit fractional portion (MFRAC) and provides the means for
high-resolution frequency generation. The output frequency f
calculated by:
The four configuration registers for the P, M (MINT & MFRAC) and N
dividers which are named Pn, MINTn, MFRACn and Nn with n=0 to
3. “n” denominates one of the four possible configurations.
IDT8N3Q001GCD REVISION A MARCH 6, 2012
2
C transaction has completed. Changing the FSEL[1:0] controls
XTAL
f OUT
reference and must be configured correctly for proper
=
f XTAL

----------- -
P N
1

2
C registers at power-up. Each

MINT
+
rd
XTAL
MFRAC
---------------------------------- -
overtone crystal and
2
C registers are
of either 114.285
2
18
+
0.5
(1)
OUT
is
4
As identified previously, the configurations of P, M (MINT & MFRAC)
and N divider settings are stored the I
configuration loaded at power-up is determined by the FSEL[1:0]
pins.
Table 4. Frequency Selection
Frequency Configuration
An order code is assigned to each frequency configuration
programmed by the factory (default frequencies). For more
information on the available default frequencies and order codes,
please see the Ordering Information Section in this document. For
available order codes, see the FemtoClock NG Ceramic-Package
XO and VCXO Ordering Product Information document.
For more information and guidelines on programming of the device
for custom frequency configurations, the register description, the
selection of fractional and integer-feedback configurations and the
serial interface description, see the FemtoClock NG Ceramic 5x7
Module Programming Guide.
0 (def.)
FSEL1
0
1
1
Input
0 (def.)
FSEL0
1
0
1
Frequency 0
Frequency 1
Frequency 2
Frequency 3
Selects
QUAD-FREQUENCY PROGRAMMABLE-XO
©2012 Integrated Device Technology, Inc.
2
C register, and the
P0, MINT0, MFRAC0, N0
P1, MINT1, MFRAC1, N1
P2, MINT2, MFRAC2, N2
P3, MINT3, MFRAC3, N3
Register