LTC6930HDCB-7.37#TRMPBF Linear Technology, LTC6930HDCB-7.37#TRMPBF Datasheet - Page 10

• Manufacturer Part Number: LTC6930HDCB-7.37#TRMPBF
• Description: IC OSCILLATOR PREC LP 8-DFN
• Manufacturer: Linear Technology
• Type: Oscillator, Siliconr

Specifications of LTC6930HDCB-7.37#TRMPBF

• Frequency: 7.3728MHz
• Voltage - Supply: 1.7 V ~ 5.5 V
• Current - Supply: 853µA
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-DFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Count: -

APPLICATIONS INFORMATION
LTC6930-X.XX
5 years is not 5 times the drift for one year. A sample cal-
culation for drift over 5 years at 30ppm/√kHr is as follows:
Drift calculations assume that the part is in continuous
operation during the entire time period of the calculation.
The movement of ions which results in drift is usually aided
by electric fields in the operating parts, and the typical drift
spec applies while the part is powered up. Conservative
calculations would use a tenth of the drift specification for
time when power is not applied to the part.
Table 1. Frequency Setting and Available Frequencies
DIV Pin Settings
[DIVC][DIVB][DIVA]
LTC6930-4.19
LTC6930-5.00
LTC6930-7.37
LTC6930-8.00
LTC6930-8.19
10
5 years • 365.25 days/year • 24 hours/day = 43,830
hours = 43.830kHr
√43.830kHr = 6.62√kHr
6.62√kHr • 30ppm/√kHr = 0.0198% over 5 years.
4.194304MHz 2.097152MHz 1.048576MHz
7.3728MHz
5.000MHz
8.000MHz
8.192MHz
000
÷1
3.6864MHz
2.500MHz
4.000MHz
4.096MHz
001
÷2
1.8432MHz
1.250MHz
2.000MHz
2.048MHz
010
÷4
524.288kHz
625.0kHz
921.6kHz
1000kHz
1024kHz
Setting the Frequency
The output frequency of the LTC6930 is chosen from the
values in Table 1 and set using the DIV pins, as noted
in the table. Master oscillator frequency is preset in the
factory, and the DIV pins select an internal binary divider
of up to 128.
For example, if the desired oscillator output frequency
is 2.5MHz, finding 2.5MHz in Table 1 shows that the
LTC6930-5.00 should be ordered, having a master
oscillator frequency of 5MHz, and a DIV value of [001]
should be used. This would equate to grounding DIVC
and DIVB, while connecting DIVA to the positive supply.
Frequencies other than those shown in Table 1 may
be requested.
011
÷8
262.144kHz
312.5kHz
460.8kHz
500.0kHz
512.0kHz
÷16
100
131.072kHz
156.25kHz
230.4kHz
250.0kHz
256.0kHz
÷32
101
65.536kHz
78.125kHz
115.2kHz
125.0kHz
128.0kHz
÷64
110
39.0625kHz
32.768kHz
57.6kHz
62.5kHz
64.0kHz
÷128
111
6930fd