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參數資料
| 型號： | AD9858 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | XO, clock |
| 英文描述： | 1 GSPS Direct Digital Synthesizer |
| 中文描述： | 1 GSPS的直接數字頻率合成器 |
| 文件頁數： | 26/32頁 |
| 文件大小： | 1412K |
| 代理商： | AD9858 |
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AD9858
CFR<19>: Clear Phase Accumulator Bit
Rev. A | Page 26 of 32
When CFR<19> = 1, the phase accumulator is synchronously
cleared and is held clear until CFR<19> is returned to a Logic 0
state (default).
CFR<18>: Not Used.
CFR<17>: PLL Fast-Lock Enable Bit
When CFR<17> = 0 (default), the PLL’s fast-lock algorithm is
disabled.
When CFR<17> = 1, the PLL’s fast-lock algorithm is active.
CFR<16>
This bit allows the user to control whether or not the PLL’s fast-
locking algorithm uses the tuning word value to determine
whether or not to enter fast-locking mode.
When CFR<16> = 0 (default), the PLL’s fast-locking algorithm
considers the relationship between the programmed frequency
tuning word and the instantaneous frequency as part of the
locking process.
When CFR<16> = 1, the PLL’s fast-locking algorithm does not
use the frequency tuning word as part of the locking process.
CFR<15>: Frequency Sweep Enable Bit
When CFR<15> = 0 (default), the device is in the single-
tone mode.
When CFR<15> = 1, the device is in the frequency-
sweep mode.
CFR<14>: Sine/Cosine Select Bit
When CFR<14> = 0 (default), the angle-to-amplitude
conversion logic employs a cosine function.
When CFR<14> = 1, the angle-to-amplitude conversion logic
employs a sine function.
CFR<13>: Charge Pump Current Offset Bit
When CFR<13> = 0 (default), the charge pump operates with
normal current settings.
When CFR<13> = 1, the charge pump operates with offset
current settings (see charge pump description).
CFR<12:11>: Phase Detector Reference
Input Frequency Divider Ratio
These bits set the phase detector divide value per Table 10.
Table 10.
CFR<12:11>
00b
01b
1xb
Phase Detector
Divider Ratio (N)
1
2
4
Notes
Default Value
LSB Ignored
CFR<10>: Charge Pump Polarity Select Bit
When CFR<10> = 0 (default), the charge pump is set up for
operation with a ground-referenced VCO. In this mode, the
charge pump sources current when the frequency at PD
IN
is
less
than the frequency at DIV
IN
. It sinks current when the opposite
is true.
When CFR<10> = 1, the charge pump is set up for a supply-
referenced VCO. In this mode, the charge pump’s source/sink
operation is opposite that for a ground-referenced VCO.
CFR<9:8>: Phase Detector Feedback
Input Frequency Divider Ratio
These bits set the phase detector divide value per Table 11.
Table 11.
CFR<9:8>
Ratio (M)
00b
1
01b
2
1xb
4
CFR<7>: Not Used
Phase Detector Divider
Notes
Default value
LSB ignored
CFR<6>: Disable Bit for the 2 GHz REFCLK Divider
When CFR<6> = 0 (default), the REFCLK divide-by-2 function
is not bypassed. REFCLK input can be up to 2 GHz.
When CFR<6> = 1, the REFCLK divide-by-2 function is
disabled. REFCLK input must be no more than 1 GHz.
CFR<5>: SYNCLK Disable Bit
When CFR<5> = 0 (default), the SYNCLK pin is active.
When CFR<5> = 1, the SYNCLK pin assumes a static Logic 0
state (disabled). In this state, the pin drive logic is shut down to
keep noise generated by the digital circuitry at a minimum.
However, the synchronization circuitry remains active
(internally) to maintain normal device timing.
CFR<4:2>: Power-Down Bits
Active high (Logic 1) powers down the respective function.
Writing a Logic 1 to all three bits causes the device to enter full-
sleep mode.
CFR<4> is used to shut down the analog mixer stage
(default = 1).
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9858/FDPCB | 制造商:Analog Devices 功能描述:EVAL KIT FOR FRACTIONAL DIVIDER EVAL BD - Bulk |
| AD9858/PCBZ | 功能描述:BOARD EVAL FOR AD9858 RoHS:是 類別:編程器，開發系統 >> 評估演示板和套件 系列:- 標準包裝:1 系列:PSoC® 主要目的:電源管理，熱管理 嵌入式:- 已用 IC / 零件:- 主要屬性:- 次要屬性:- 已供物品:板，CD，電源 |
| AD9858/TLPCB | 制造商:Analog Devices 功能描述:NCO/DDS, 1GSPS DIRECT DGTL SYNTHESIZER - Bulk |
| AD9858/TLPCBZ | 制造商:Analog Devices 功能描述:EVAL BOARD - Bulk |
| AD9858BSV | 制造商:Rochester Electronics LLC 功能描述:1000 MHZ DDS/DAC - Bulk 制造商:Analog Devices 功能描述:1GHZ DDS/DAC SMD 9858 TQFP100 制造商:Analog Devices 功能描述:Frequency Synthesizer,AD9858 1GHz TQFP |
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