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參數資料
| 型號： | AD9953ASV |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 數字信號處理外設 |
| 英文描述： | 400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer |
| 中文描述： | DSP-NUM CONTROLLED OSCILLATOR, PQFP48 |
| 封裝： | TQFP-48 |
| 文件頁數： | 27/42頁 |
| 文件大小： | 473K |
| 代理商： | AD9953ASV |
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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.
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| 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 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 |
| AD9953YSVZ | 功能描述:IC DDS DAC 14BIT 400MSPS 48-TQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 直接數字合成 (DDS) 系列:- 產品變化通告:Product Discontinuance 27/Oct/2011 標準包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調節字寬（位）:32 b 電源電壓:2.97 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD9953YSVZ-REEL7 | 功能描述:IC DDS DAC 14BIT 1.8V 48TQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 直接數字合成 (DDS) 系列:- 產品變化通告:Product Discontinuance 27/Oct/2011 標準包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調節字寬（位）:32 b 電源電壓:2.97 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
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