參數(shù)資料
型號(hào)： 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(shù)字頻率合成器
文件頁(yè)數(shù)： 27/42頁(yè)
文件大?。?/td> 473K
代理商： AD9953
PRELIMINARY TECHNICAL DATA
Continuous Bi-directional Ramp mode allows the AD9953 to offer an automatic symmetrical
sweep between two frequencies. The AD9953 is programmed for Continuous Bi-directional Ramp
mode by writing the RAM Enable bit true and the RAM Mode Control bits of each profile to be
used to logic 011(b).
Upon entering this mode (via an I/O UPDATE or changing Profile<1:0>), the RAM address
generator loads the RAM Segment Beginning Address bits of the current RSCW and the Ramp
Rate Timer loads the RAM Segment Address Ramp Rate bits. The RAM drives data from the
beginning address and the ramp rate timer begins to count down to 1. When the ramp rate timer
completes a cycle, the RAM address generator increments to the next address, the timer reloads the
ramp rate bits and continues counting down. This sequence continues until the RAM address
generator has incremented to an address equal to the RAM Segment Final Address bits of the
current RSCW. Upon reaching this terminal address, the RAM address generator will decrement
in value at the ramp rate until it reaches the RAM Segment Beginning address. Upon reaching the
beginning address, the entire sequence repeats.
The
entire sequence repeats for as long as the part is programmed for this mode. The No Dwell bit
is a “don’t care” in this mode. In general, this mode is identical in control to the Bi-directional
Ramp Mode except the ramp up and down is automatic (no external control via the Profile<0>
input) and switching profiles is valid. Once in this mode, the address generator ramps from
beginning address to final address back to beginning address at the rate programmed into the ramp
rate register. This mode enables generation of an automatic saw tooth sweep characteristic.
Notes to the Continuous Bi-directional Ramp mode:
1) The user must insure that the beginning address is lower than the final address.
2) Changing profiles or issuing an I/O UPDATE automatically terminates the current sweep
and starts the next sweep.
3) Setting the RAM destination bit true such that the RAM output drives the phase-offset adder
is valid. While the above discussion describes a frequency sweep, a phase sweep operation
is also available.
Continuous Re-circulate Mode
Continuous Re-circulate mode allows the AD9953 to offer an automatic, continuous unidirectional
sweep between two frequencies. The AD9953 is programmed for Continuous Re-circulate mode
by writing the RAM Enable bit true and the RAM Mode Control bits of each profile to be used to
logic 100(b).
Upon entering this mode (via an I/O UPDATE or changing Profile<1:0>), the RAM address
generator loads the RAM Segment Beginning Address bits of the current RSCW and the Ramp
Rate Timer loads the RAM Segment Address Ramp Rate bits. The RAM drives data from the
REV. PrB 1/30/03
Page 27
AD9953
Analog Devices, Inc.
相關(guān)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(guān)代理商/技術(shù)參數(shù)
參數(shù)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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