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| 型號： | AD9524BCPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 31/56頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC INTEGER-N CLCK GEN 48LFCSP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 時鐘/頻率發(fā)生器，扇出緩沖器（分配） |
| PLL： | 是 |
| 主要目的： | 以太網(wǎng)，光纖通道，SONET/SDH |
| 輸入： | CMOS |
| 輸出： | HSTL，LVCMOS，LVDS，LVPECL |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 2:6 |
| 差分 - 輸入:輸出： | 是/是 |
| 頻率 - 最大： | 1GHz |
| 電源電壓： | 1.71 V ~ 3.465 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 48-LFCSP-VQ（7x7） |
| 包裝： | 托盤 |
| 相關(guān)產(chǎn)品： | AD9524BCPZ-REEL7DKR-ND - IC INTEGER-N CLCK GEN 48LFCSP AD9524BCPZ-REEL7CT-ND - IC INTEGER-N CLCK GEN 48LFCSP AD9524/PCBZ-ND - BOARD EVAL FOR AD9524 AD9524BCPZ-REEL7TR-ND - IC INTEGER-N CLCK GEN 48LFCSP |
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Data Sheet
AD9524
Rev. E | Page 37 of 56
POWER DISSIPATION AND THERMAL CONSIDERATIONS
The AD9524 is a multifunctional, high speed device that targets
a wide variety of clock applications. The numerous innovative
features contained in the device each consume incremental power.
If all outputs are enabled in the maximum frequency and mode
that have the highest power, the safe thermal operating conditions
of the device may be exceeded. Careful analysis and consideration
of power dissipation and thermal management are critical
elements in the successful application of the AD9524 device.
The AD9524 device is specified to operate within the industrial
ambient temperature range of –40°C to +85°C. This specification is
conditional, however, such that the absolute maximum junction
temperature is not exceeded (as specified in Table 17). At high
operating temperatures, extreme care must be taken when
operating the device to avoid exceeding the junction temperature
and potentially damaging the device.
A maximum junction temperature is listed in Table 1 with the
ambient operating range. The ambient range and maximum
junction temperature specifications ensure the performance of the
device as guaranteed in the Specifications section.
Many variables contribute to the operating junction temperature
within the device, including
Selected driver mode of operation
Output clock speed
Supply voltage
Ambient temperature
The combination of these variables determines the junction
temperature within the AD9524 device for a given set of
operating conditions.
ensure that TA is not exceeded, an airflow source can be used.
Use the following equation to determine the junction
temperature on the application PCB:
TJ = TCASE + (ΨJT × PD)
where:
TJ is the junction temperature (°C).
TCASE is the case temperature (°C) measured by the user at the
top center of the package.
PD is the power dissipation of the AD9524.
Values of θJA are provided for package comparison and PCB
design considerations. θJA can be used for a first-order
approximation of TJ by the equation
TJ = TA + (θJA × PD)
where TA is the ambient temperature (°C).
Values of θJC are provided for package comparison and PCB design
considerations when an external heat sink is required.
Values of ΨJB are provided for package comparison and PCB design
considerations.
CLOCK SPEED AND DRIVER MODE
Clock speed directly and linearly influences the total power
dissipation of the device and, therefore, the junction temperature.
Two operating frequencies are listed under the incremental power
dissipation parameter in Table 3. Using linear interpretation is
a sufficient approximation for frequency not listed in the table.
When calculating power dissipation for thermal consideration,
the amount of power dissipated in the 100 resistor should be
removed. If using the data in Table 2, this power is already
removed. If using the current vs. frequency graphs provided in
the Typical Performance Characteristics section, the power into
the load must be subtracted, using the following equation:
100
2
Swing
Voltage
Output
al
Differenti
EVALUATION OF OPERATING CONDITIONS
The first step in evaluating the operating conditions is to determine
the maximum power consumption (PD) internal to the AD9524.
The maximum PD excludes power dissipated in the load resistors
of the drivers because such power is external to the device. Use the
power dissipation specifications listed in Table 3 to calculate the
total power dissipated for the desired configuration. The base
typical configuration parameter in Table 3 lists a power of 428 mW,
which includes one LVPECL output at 122.88 MHz. If the
frequency of operation is not listed in Table 3, see the Typical
Performance Characteristics section, current vs. frequency and
driver mode, to calculate the power dissipation; then add 20% for
maximum current draw. Remove the power dissipated in the load
resistor to achieve the most accurate power dissipation internal
to the AD9524. See Table 30 for a summary of the incremental
power dissipation from the base power configuration for two
different examples.
Table 30. Temperature Gradient Examples
Description
Mode
Frequency
(MHz)
Maximum
Power (mW)
Example 1
Base Typical
Configuration
428
Output Driver
5 × LVPECL
122.88
275
Total Power
703
Example 2
Base Typical
Configuration
428
Output Driver
5 × LVPECL
983.04
795
Total Power
1223
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| AD9524BCPZ-REEL7 | 功能描述:IC INTEGER-N CLCK GEN 48LFCSP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 專用 系列:- 標(biāo)準(zhǔn)包裝:28 系列:- 類型:時鐘/頻率發(fā)生器 PLL:是 主要目的:Intel CPU 服務(wù)器 輸入:時鐘 輸出:LVCMOS 電路數(shù):1 比率 - 輸入:輸出:3:22 差分 - 輸入:輸出:無/是 頻率 - 最大:400MHz 電源電壓:3.135 V ~ 3.465 V 工作溫度:0°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:64-TFSOP （0.240"，6.10mm 寬） 供應(yīng)商設(shè)備封裝:64-TSSOP 包裝:管件 |
| AD9525 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Jitter Clock Generator with Eight LVPECL Outputs |
| AD9525/PCBZ | 功能描述:時鐘和定時器開發(fā)工具 Evaluation kit 2950MHz VCO installed RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V |
| AD9525/PCBZ-VCO | 功能描述:時鐘和定時器開發(fā)工具 Evaluation kit CRO29508 VCO installed RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V |
| AD9525BCPZ | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 High performance clock distributor Exter RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
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