3. Ordering Information
. Specific device configurations are programmed into the Si550 at time of shipment. Configurations are
Figure 1. Part Number Convention
R = Tape & Reel
Blank = Trays
Operating Temp Range (°C)
G –40 to +85 °C
Device Revision Letter
550 VCXO
Product Family
550
X X
XXXMXXX
D G R
1
st
Option Code
V
DD
Output Format Output Enable Polarity
A 3.3 LVPECL High
B 3.3 LVDS High
C 3.3 CMOS High
D3.3CML High
E 2.5 LVPECL High
F 2.5 LVDS High
G 2.5 CMOS High
H2.5CML High
J 1.8 CMOS High
K1.8CML High
M3.3LVPECL Low
N3.3LVDS Low
P3.3CMOS Low
Q3.3CML Low
R2.5LVPECL Low
S2.5LVDS Low
T2.5CMOS Low
U2.5CML Low
V1.8CMOS Low
W1.8CML Low
Note
:
CMOS available to 160 MHz.
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
D50 90 803025
E 20 45 25 Note 6 Note 6
F50 135 1007550
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: 550AF622M080DGR is a 5 x 7 mm VCXO in a 6 pad package. The nominal frequency is 622.080 MHz, with a 3.3 V supply,
LVPECL output, and Output Enable active high polarity. 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.
Frequency (e.g. 622M080 is 622.080 MHz)
Available frequency range is 10 to 945 MHz, 970 to 1134, and 1213 to
1417 MHz. The position of “M” shifts to denote higher or lower
frequencies. If the frequency of interest requires greater than 6 digit
resolution, a six digit code will be assigned for the specific frequency.
