参数资料
型号: ADSP-21489KSWZ-4A
厂商: Analog Devices Inc
文件页数: 18/68页
文件大小: 0K
描述: IC CCD SIGNAL PROCESSOR 100LQFP
标准包装: 1
系列: SHARC®
类型: 浮点
接口: EBI/EMI,DAI,I²C,SPI,SPORT,UART/USART
时钟速率: 400MHz
非易失内存: 外部
芯片上RAM: 5Mb
电压 - 输入/输出: 3.30V
电压 - 核心: 1.10V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 100-LQFP 裸露焊盘
供应商设备封装: 100-LQFP-EP(14x14)
包装: 托盘
Rev. B
|
Page 25 of 68
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March 2013
Clock Signals
The ADSP-2148x can use an external clock or a crystal. See the
CLKIN pin description in Table 11 on Page 14. Programs can
configure the processor to use its internal clock generator by
connecting the necessary components to CLKIN and XTAL.
Figure 7 shows the component connections used for a crystal
operating in fundamental mode. Note that the clock rate is
achieved using a 25 MHz crystal and a PLL multiplier ratio 16:1
(CCLK:CLKIN achieves a clock speed of 400 MHz). To achieve
the full core clock rate, programs need to configure the multi-
plier bits in the PMCTL register.
Figure 7. Recommended Circuit for
Fundamental Mode Crystal Operation
C1
22pF
Y1
R1
XTAL
CLKIN
C2
22pF
25MHz
R2
47
TYPICAL VALUES
ADSP-2148x
CHOOSE C1 AND C2 BASED ON THE CRYSTAL Y1.
R2 SHOULD BE CHOSEN TO LIMIT CRYSTAL DRIVE
POWER. REFER TO CRYSTAL MANUFACTURER’S
SPECIFICATIONS.
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