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鍙冩暩(sh霉)璩囨枡
| 鍨嬭櫉(h脿o)锛� | CS5351-BZZ |
| 寤�(ch菐ng)鍟嗭細 | Cirrus Logic Inc |
| 鏂囦欢闋�(y猫)鏁�(sh霉)锛� | 2/16闋�(y猫) |
| 鏂囦欢澶�?銆�?/td> | 0K |
| 鎻忚堪锛� | IC ADC AUD 108DB 204KHZ 24-TSSOP |
| 妯�(bi膩o)婧�(zh菙n)鍖呰锛� | 62 |
| 浣嶆暩(sh霉)锛� | 24 |
| 閲囨ǎ鐜囷紙姣忕锛夛細 | 204k |
| 鏁�(sh霉)鎿�(j霉)鎺ュ彛锛� | 涓茶 |
| 杞�(zhu菐n)鎻涘櫒鏁�(sh霉)鐩細 | 2 |
| 鍔熺巼鑰楁暎锛堟渶澶э級锛� | 243mW |
| 闆诲闆绘簮锛� | 妯℃摤鍜屾暩(sh霉)瀛� |
| 宸ヤ綔婧害锛� | -40°C ~ 85°C |
| 瀹夎椤�(l猫i)鍨嬶細 | 琛ㄩ潰璨艰 |
| 灏佽/澶栨锛� | 24-TSSOP锛�0.173"锛�4.40mm 瀵級 |
| 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁濓細 | 24-TSSOP |
| 鍖呰锛� | 绠′欢 |
| 杓稿叆鏁�(sh霉)鐩拰椤�(l猫i)鍨嬶細 | 2 鍊�(g猫)鍠锛屽柈妤� |
| 閰嶇敤锛� | 598-1781-ND - EVALUATION BOARD FOR CS5351 |
| 鍏跺畠鍚嶇ū(ch膿ng)锛� | 598-1084-5 |
绗�1闋�(y猫)鐣�(d膩ng)鍓嶇2闋�(y猫)绗�3闋�(y猫)绗�4闋�(y猫)绗�5闋�(y猫)绗�6闋�(y猫)绗�7闋�(y猫)绗�8闋�(y猫)绗�9闋�(y猫)绗�10闋�(y猫)绗�11闋�(y猫)绗�12闋�(y猫)绗�13闋�(y猫)绗�14闋�(y猫)绗�15闋�(y猫)绗�16闋�(y猫)
IDT / ICS 3.3V LVPECL CLOCK GENERATOR
10
ICS843001AG REV B March 2, 2009
ICS843001
FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS843001.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS843001 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 * 93mA = 322.2mW
Power (outputs)
MAX
= 30mW/Loaded Output pair
Total Power
_MAX
(3.465V, with all outputs switching) = 322.2mW + 30mW = 352.2mW
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掳C.
The equation for Tj is as follows: Tj =
胃
JA * Pd_total + TA
Tj = Junction Temperature
胃
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
胃
JA must be used. Assuming a
moderate air flow of 1 meter per second and a multi-layer board, the appropriate value is 90.5掳C/W per Table 7 below.
Therefore, Tj for an ambient temperature of 85掳C with all outputs switching is:
85掳C + 0.352W * 90.5掳C/W = 116.9掳C. This is below the limit of 125掳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).
TABLE 7. THERMAL RESISTANCE
胃胃胃胃胃
JA
FOR
8-PIN TSSOP, FORCED CONVECTION
胃胃胃胃胃
JA
by Velocity (Meters per Second)
0
1
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
101.7掳C/W
90.5掳C/W
89.8掳C/W
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