3. Ordering Information
. Specific device configurations are programmed into the Si552 at time of shipment. Configurations are
Figure 1. Part Number Convention
DD
R = Tape & Reel
Blank = Coil Tape
Operating Temp Range (°C)
G –40 to +85 °C
Device Revision Letter
552 Dual VCXO
Product Family
1
st
Option Code
Code VDD Output Format
A 3.3 LVPECL
B3.3LVDS
C3.3CMOS
D3.3CML
E 2.5 LVPECL
F2.5LVDS
G2.5CMOS
H2.5CML
J1.8CMOS
K1.8CML
Notes:
CMOS available to 160 MHz.
552
X X
XXXXXX
D G R
2
nd
Option Code
Temperature Tuning Slope Minimum APR
Stability Kv (±ppm) for VDD @
Code ± ppm (max) ppm/V (typ) 3.3 V 2.5 V 1.8 V
A 100 180 100 75 25
B 100 90 30 Note 6 Note 6
C 50 180 150 125 75
D5090803025
E 20 45 25 Note 6 Note 6
F 50 135 100 75 50
G 20 356 375 300 235
H 20 180 185 145 105
J 20 135 130 104 70
K 100 356 295 220 155
M 20 33 12 Note 6 Note 6
Notes:
1. For best jitter and phase noise performance , always choose the smallest Kv that meets
the application s minimum APR requirements. Unlike SAW-based solutions which
require higher higher Kv values to account for their higher temperature dependence ,
the Si55x series provides lower Kv options to minimize noise coupling and jitter in real -
world PLL designs. See AN255 and AN266 for more information.
2. APR is the ability of a VCXO to track a signal over the product lifetime . A VCXO with an
APR of ±25 ppm is able to lock to a clock with a ± 25 ppm stability over 15 years over all
operating conditions.
3. Nominal Pull range (±) = 0.5 x V
DD
x tuning slope.
4. Nominal Absolute Pull Range (±APR) = Pull range – stability – lifetime aging
= 0.5 x V
DD
x tuning slope – stability – 10 ppm
5. Minimum APR values noted above include worst case values for all parameters .
6. Combination not available.
Example Part Number: 552AF000108DGR is a 5x7mm Dual VCXO in a 6 pad package. Since the six digit code (000108) is >
000100, f0 is 644.53125 MHz (lower frequency) and f1 is 693.48299 (higher frequency), with a 3.3V supply and LVPECL output.
Temperature stability is specified as ± 50 ppm and the tuning slope is 135 ppm/V. The part is specified for a -40 to +85 C° ambient
temperature range operation and is shipped in tape and reel format .
6-digit Frequency Designator Code
Two unique frequencies can be specified within the following bands of frequencies : 10 to
945 MHz, 970 to 1134 MHz, and 1213 to 1417 MHz. A six digit code will be assigned for
the specified combination of frequencies . Codes > 000100 refer to dual XOs programmed
with the lower frequency value selected when FS = 0, and the higher value when FS = 1.
Six digit codes < 000100 refer to dual XOs programmed with the higher frequency value
selected when FS = 0, and the lower value when FS = 1.
