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參數(shù)資料
| 型號： | ICS843001I-22 |
| 英文描述： | FEMTOCLOCKS⑩ CRYSTAL/LVCMOS-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER |
| 中文描述： | FEMTOCLOCKS⑩CRYSTAL/LVCMOS-TO-3.3V，2.5V的LVPECL的頻率合成器 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 211K |
| 代理商： | ICS843001I-22 |
843001AGI-22
www.icst.com/products/hiperclocks.html
REV. A AUGUST 1, 2005
13
Integrated
Circuit
Systems, Inc.
ICS843001I-22
F
EMTO
C
LOCKS
C
RYSTAL
/LVCMOS-
TO
-
3.3V, 2.5V LVPECL F
REQUENCY
S
YNTHESIZER
P
OWER
C
ONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS843001I-22.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS843001I-22 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for V
CC
= 3.3V + 5% = 3.465V, which gives worst case results.
NOTE:
Please refer to Section 3 for details on calculating power dissipated in the load.
Power (core)
MAX
= V
CC_MAX
* I
EE_MAX
= 3.465V * 160mA =
554.4mW
Power (outputs)
MAX
=
30mW/Loaded Output pair
Total Power
_MAX
(3.465V, with all outputs switching) =
554.4mW + 30mW =
584.4mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of
the device. The maximum recommended junction temperature for HiPerClockS
TM
devices is 125°C.
The equation for Tj is as follows: Tj =
θ
JA
* Pd_total + T
A
Tj = Junction Temperature
θ
JA
= Junction-to-Ambient Thermal Resistance
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
T
A
= Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance
θ
must be used.
Assuming a moderate air flow of 1 meter per second and a multi-layer board, the appropriate value is 65°C/W per Table 8
below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.584W * 65°C/W = 123°C. This is below the limit of 125°C.
This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air
flow, and the type of board (single layer or multi-layer).
T
ABLE
8. T
HERMAL
R
ESISTANCE
θ
JA
FOR
24-
PIN
TSSOP, F
ORCED
C
ONVECTION
θ
JA
by Velocity (Meters per Second)
0
1
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
70°C/W
65°C/W
62°C/W
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICS843001I-23 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL/LVCMOS FREQUENCY SYNTHESIZER |
| ICS843002 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS843002-01 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS843002-31 | 制造商:ICS 制造商全稱:ICS 功能描述:700MHZ FEMTOCLOCKS⑩ VCXO BASED FREQUENCY TRANSLATOR AND JITTER ATTENUATOR |
| ICS843002A01 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
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