參數(shù)資料
型號: ICS844S42BKILFT
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 14/27頁
文件大小: 0K
描述: IC SYNTHESIZER RF FREQ 56-VFQFPN
標(biāo)準(zhǔn)包裝: 1,000
系列: HiPerClockS™
類型: 頻率合成器
PLL: 帶旁路
輸入: LVCMOS,LVTTL,晶體
輸出: LVDS,LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 2:2
差分 - 輸入:輸出: 無/是
頻率 - 最大: 2.592GHz
除法器/乘法器: 是/無
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 56-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 56-VFQFP-EP(8x8)
包裝: 帶卷 (TR)
其它名稱: 844S42BKILFT
ICS844S42BKI REVISION A FEBRUARY 21, 2012
21
2012 Integrated Device Technology, Inc.
ICS844S42I Data Sheet
DUAL OUTPUT RF FREQUENCY SYNTHESIZER
Power Considerations – LVPECL Outputs
This section provides information on power dissipation and junction temperature for the ICS844S42I, for all outputs that are configured to
LVPECL (LEV_SEL = 1). Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the ICS844S42I is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for VDD = 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 = VDD_MAX * IGND_MAX = 3.465V * 260mA = 900.9mW
Power (outputs)MAX = 36mW/Loaded Output pair
If all outputs are loaded, the total power is 2 * 36mW = 72mW
Total Power_MAX (3.465V, with all outputs switching) = 800.9mW + 72mW = 972.9mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad directly affects the reliability of the device. The
maximum recommended junction temperature is 125°C. Limiting the internal transistor junction temperature, Tj, to 125°C ensures that the bond
wire and bond pad temperature remains below 125°C.
The equation for Tj is as follows: Tj =
JA * Pd_total + TA
Tj = Junction Temperature
JA = Junction-to-Ambient Thermal Resistance
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
TA = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance
JA must be used. Assuming no air flow and
a multi-layer board, the appropriate value is 31.4°C/W per Table 7A below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.973W * 31.4°C/W = 115.6°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 (multi-layer).
Table 7A. Thermal Resistance JA for 56 Lead VFQFN Forced Convection
JA by Velocity
Meters per Second
01
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
31.4°C/W
27.5°C/W
24.6°C/W
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