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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： | 26/42頁 |
| 文件大?。?/td> | 473K |
| 代理商： | AD9953PCB |
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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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