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參數資料
| 型號： | AD9953 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | XO, clock |
| 英文描述： | 400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer |
| 中文描述： | 400 MSPS的14位，1.8V CMOS的直接數字頻率合成器 |
| 文件頁數： | 37/42頁 |
| 文件大小： | 473K |
| 代理商： | AD9953 |
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PRELIMINARY TECHNICAL DATA
The CrystalOut pin is static until the CFR2<1> bit is set, enabling the output. The drive strength of
the CrystalOut pin is typically very low, so this signal should be buffered prior to using it to drive
any loads.
AD9953
Serial Port Operation
With the AD9953, the Instruction Byte specifies read/write operation and register address. Serial
operations on the AD9953 occur only at the register level, not the byte level. For the AD9953, the
serial port controller recognizes the Instruction Byte register address and automatically generates
the proper register byte address. In addition, the controller expects that all bytes of that register will
be accessed.
It is a requirement that all bytes of a register be accessed during serial I/O
operations,
with one exception. The SYNCIO function can be used to abort an IO operation
thereby allowing less than all bytes to be accessed.
There are two phases to a communication cycle with the AD9953. Phase 1 is the instruction cycle,
which is the writing of an instruction byte into the AD9953, coincident with the first eight SCLK
rising edges. The instruction byte provides the AD9953 serial port controller with information
regarding the data transfer cycle, which is Phase 2 of the communication cycle. The Phase 1
instruction byte defines whether the upcoming data transfer is read or write and the serial address
of the register being accessed. [Note – the serial address of the register being accessed is NOT the
same address as the bytes to be written. See the Example Operation section below for details].
The first eight SCLK rising edges of each communication cycle are used to write the instruction
byte into the AD9953. The remaining SCLK edges are for Phase 2 of the communication cycle.
Phase 2 is the actual data transfer between the AD9953 and the system controller. The number of
bytes transferred during Phase 2 of the communication cycle is a function of the register being
accessed. For example, when accessing the Control Function Register 2, which is three bytes wide,
Phase 2 requires that three bytes be transferred. If accessing the Frequency Tuning Word, which is
four bytes wide, Phase 2 requires that four bytes be transferred. After transferring all data bytes per
the instruction, the communication cycle is completed.
At the completion of any communication cycle, the AD9953 serial port controller expects the next
8 rising SCLK edges to be the instruction byte of the next communication cycle.All data input to
the AD9953 is registered on the rising edge of SCLK. All data is driven out of the AD9953 on the
falling edge of SCLK. Figures 34 - 37 are useful in understanding the general operation of the
AD9953 Serial Port.
REV. PrB 1/30/03
Page 37
Analog Devices, Inc.
相關PDF資料 |
PDF描述 |
|---|---|
| AD9953ASV | 400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer |
| AD9953PCB | 400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer |
| AD9954 | 400 MSPS 14-Bit, 1.8 V CMOS Direct Digital Synthesizer |
| AD9954YSV | 400 MSPS 14-Bit, 1.8 V CMOS Direct Digital Synthesizer |
| AD9954YSV-REEL7 | 400 MSPS 14-Bit, 1.8 V CMOS Direct Digital Synthesizer |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9953/PCB | 制造商:Analog Devices 功能描述:400 MSPS, 14BIT DGTL SYNTHESIZER - Bulk |
| AD9953ASV | 制造商:AD 制造商全稱:Analog Devices 功能描述:400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer |
| AD9953PCB | 制造商:AD 制造商全稱:Analog Devices 功能描述:400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer |
| AD9953YSV | 制造商:Analog Devices 功能描述:Direct Digital Synthesizer 400MHz 1-DAC 14-Bit Serial 48-Pin TQFP EP 制造商:Rochester Electronics LLC 功能描述:AD9953 400 MSPS DDS W/ 14 BIT DAC - Bulk 制造商:Analog Devices 功能描述:IC DDS 400MSPS SMD 9953 TQFP48 |
| AD9953YSV-REEL7 | 制造商:Analog Devices 功能描述:Direct Digital Synthesizer 400MHz 1-DAC 14-Bit Serial 48-Pin TQFP EP T/R |
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