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參數資料
| 型號： | AD9957_07 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 1 GSPS Quadrature Digital Upconverter with 18-Bit IQ Data Path and 14-Bit DAC |
| 中文描述： | 1 GSPS的正交數字上變頻器與18位智商數據路徑和14位DAC |
| 文件頁數： | 32/60頁 |
| 文件大小： | 840K |
| 代理商： | AD9957_07 |
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AD9957
Rev. 0 | Page 32 of 60
0
START ADDRESS
END ADDRESS
1
1
2
3
4
5
RAM ADRESS
Δ
t
1 PDCLK CYCLE
OR
M DDS CLOCK CYCLES
I/O_UPDATE OR
RT TRANSITION
Figure 46. Continuous Recirculate Timing Diagram
RAM Continuous Recirculate Mode
The continuous recirculate mode mimics ramp-up mode,
except that when the state machine reaches the end address of
the active RAM segment register, it does not halt. Instead, the
next timeout of the internal timer causes the state machine to
jump to the start address of the active RAM segment register.
This process continues indefinitely until an I/O update or state
change on the RT pin. A state change on the RT pin aborts the
current waveform and the newly selected RAM segment register
initiates a new waveform.
A graphic representation of the continuous recirculate mode is
shown in Figure 46.
The circled numbers in Figure 46 indicate specific events, which
are explained as follows:
Event 1—an I/O update or state change on the RT pin occurs.
This initializes the state machine to the start address of the
active RAM segment register and causes the state machine to
begin incrementing the address counter at the appropriate rate.
Event 2—the state machine reaches the end address of the active
RAM segment register.
Event 3—the state machine switches to the start address of the
active RAM segment register. The state machine continues to
increment the address counter.
Event 4—the state machine again reaches the end address of the
active RAM segment register.
Event 5—the state machine switches to the start address of the
active RAM segment register. The state machine continues to
increment the address counter.
Event 4 and Event 5 repeat until an I/O update or state change
occurs on the RT pin.
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相關代理商/技術參數 |
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| AD9957BCPZ | 制造商:Analog Devices 功能描述:GSPS QUADRATURE DIGITAL UPCONVERTER W/18-BIT IQ DATA PATH - Trays |
| AD9957BSVZ | 功能描述:IC DDS 1GSPS 14BIT IQ 100TQFP 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) |
| AD9957BSVZ-REEL | 功能描述:IC DDS 1GSPS 14BIT IQ 100TQFP 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) |
| AD9957BSVZREEL13 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1 GSPS Quadrature Digital Upconverter w/18-Bit IQ Data Path and 14-Bit DAC |
| AD9958 | 制造商:AD 制造商全稱:Analog Devices 功能描述:2-Channel 500 MSPS DDS with 10-Bit DACs |
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