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參數資料
| 型號： | AD9953PCB |
| 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： | 33/42頁 |
| 文件大?。?/td> | 473K |
| 代理商： | AD9953PCB |
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PRELIMINARY TECHNICAL DATA
AD9953
ASF<15:14> (binary)
00
01
10
11
Table 5 Auto-Scale Factor Internal Step Size
Increment/decrement size
1
2
4
8
A special feature of this mode is that the maximum output amplitude allowed is limited by the
contents of the Amplitude Scale Factor Register. This allows the user to ramp to a value less than
full scale.
OSK Ramp Rate Timer
The OSK ramp rate timer is a loadable down counter, which generates the clock signal to the 14-bit
counter that generates the internal scale factor. The ramp rate timer is loaded with the value of the
ASFR every time the counter reaches 1 (decimal). This load and count down operation continues
for as long as the timer is enabled unless the timer is forced to load before reaching a count of 1.
If the Load OSK Timer bit (CFR1<26>) is set, the ramp rate timer is loaded upon an I/O
UPDATE, change in profile input or upon reaching a value of 1. The ramp timer can be loaded
before reaching a count of 1 by three methods.
Method one is by changing the OSK input pin. When the OSK input pin changes state the ASFR
value is loaded into the ramp rate timer, which then proceeds to count down as normal.
The second method in which the sweep ramp rate timer can be loaded before reaching a count of 1
is if the Load OSK Timer bit (CFR1<26>) bit is set and an I/O UPDATE (or change in profile) is
issued.
The last method in which the sweep ramp rate timer can be loaded before reaching a count of 1 is
when going from the inactive AUTO Shaped On-Off Keying mode
to the active AUTO Shaped
On-Off Keying mode. That is, when the sweep enable bit is being set.
External Shaped On-Off Keying mode operation:
The external Shaped On-Off Keying mode
is enabled by writing CFR1<25> to a logic 1 AND
writing CFR1<24> to a logic 0. When configured for external Shaped On-Off Keying, the content
of the ASFR becomes the scale factor for the data path. The scale factors are synchronized to
sync_clk via the I/O update functionality.
REV. PrB 1/30/03
Page 33
Analog Devices, Inc.
相關PDF資料 |
PDF描述 |
|---|---|
| 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 |
| AD9956 | 2.7 GHz DDS-Based AgileRF |
| AD9956YCPZ-REEL1 | 2.7 GHz DDS-Based AgileRF |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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) |
| AD9954 | 制造商:AD 制造商全稱:Analog Devices 功能描述:400 MSPS 14-Bit, 1.8 V CMOS Direct Digital Synthesizer |
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