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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)： 26/42頁(yè)
文件大小： 473K
代理商： AD9953
PRELIMINARY TECHNICAL DATA
Bi-directional Ramp mode allows the AD9953 to offer a symmetrical sweep between two
frequencies using the Profile<0> signal as the control input. The AD9953 is programmed for Bi-
directional Ramp mode by writing the RAM Enable bit true and the RAM Mode Control bits of
RSCW0 to logic 010(b). In Bi-directional Ramp mode, the Profile<1> input is ignored and the
Profile<0> input is the ramp direction indicator. In this mode, the memory is not segmented and
uses only a single beginning and final address. The address registers that affect the control of the
RAM are located in the RSCW associated with profile 0.
Upon entering this mode (via an I/O UPDATE or changing Profile<0>), the RAM address
generator loads the RAM Segment Beginning Address bits of RSCW0 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. While operating in this mode, toggling
the Profile<0> pin does not cause the device to generate an internal I/O UPDATE. That is to say,
when the Profile<0> pin is acting as the ramp direction indicator, any transfer of data from the I/O
buffers to the internal registers can only be initiated by a rising edge on the I/O UPDATE pin.
RAM address control now is a function of the Profile<0> input. When the Profile<0> bit is a logic
one, the RAM address generator increments to the next address when the ramp rate timer
completes a cycle (and reloads to start the timer again). As in the Ramp-Up mode, this sequence
continues until the RAM address generator has incremented to an address equal to the final address
as long as the Profile<0> input remains high
.
If the Profile<0> input goes low, the RAM address
generator immediately decrements and the ramp rate timer is reloaded. The RAM address
generator will continue to decrement at the ramp rate period until the RAM address is equal to the
beginning address as long as the Profile<0> input remains low
.
The
sequence of ramping up and down is controlled via the Profile<0> input signal for as long as
the part is programmed into this mode. The no dwell bit is a “don’t care” in this mode as is all data
in the RAM Segment Control Words associated with profiles 1,2,3. Only the information in the
RAM Segment Control Word for profile 0 is used to control the RAM in the Bi-Directional Ramp
Mode.
Notes to the Bi-directional Ramp mode:
1) The user must insure that the beginning address is lower than the final address.
2) Issuing an I/O UPDATE automatically terminates the current sweep causing the starting
address to be reloaded and the ramp rate timer to initialize.
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 Bi-directional Ramp Mode
AD9953
REV. PrB 1/30/03
Page 26
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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