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参数资料
| 型号： | AD9858/PCBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD9858 |
| 产品培训模块： | Direct Digital Synthesis Tutorial Series (1 of 7): Introduction Direct Digital Synthesizer Tutorial Series (7 of 7): DDS in Action Direct Digital Synthesis Tutorial Series (3 of 7): Angle to Amplitude Converter Direct Digital Synthesis Tutorial Series (6 of 7): SINC Envelope Correction Direct Digital Synthesis Tutorial Series (4 of 7): Digital-to-Analog Converter Direct Digital Synthesis Tutorial Series (2 of 7): The Accumulator |
| 设计资源： | Low Jitter Sampling Clock Generator for High Performance ADCs Using AD9958/9858 and AD9515 (CN0109) |
| 标准包装： | 1 |
| 主要目的： | 计时，直接数字合成（DDS） |
| 已用 IC / 零件： | AD9858/TL |
| 已供物品： | 板 |
| 其它名称： | AD9858/PCB AD9858/PCB-ND |
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AD9858
Rev. C | Page 24 of 32
CFR[22]: Auto Clear Phase Accumulator Bit
When CFR[22] = 0 (default), a new frequency tuning word is
applied to the input of the phase accumulator and added to the
currently stored value.
When CFR[22] = 1, this bit automatically synchronously clears
(loads zeros into) the phase accumulator for one cycle upon
reception of the FUD sequence indicator.
CFR[21]: Load Delta Frequency Timer
When CFR[21] = 0 (default), the contents of the delta frequency
ramp rate word are loaded into the ramp rate timer (down counter)
upon detection of a FUD sequence.
When CFR[21] = 1, the contents of the delta frequency ramp
rate word are loaded into the ramp rate timer upon timeout
with no regard to the state of the FUD sequence indicator (that
is, the FUD sequence indicator is ignored).
CFR[20]: Clear Frequency Accumulator Bit
When CFR[20] = 1, the frequency accumulator is synchronously
cleared and is held clear until CFR[20] is returned to a Logic 0
state (default).
CFR[19]: Clear Phase Accumulator Bit
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]: 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]: FTW for Fast Lock Bit
This bit allows the user to control whether or not the PLL’s fast
lock algorithm uses the tuning word value to determine
whether or not to enter fast locking mode.
When CFR[16] = 0 (default), the fast locking algorithm of the
PLL considers the relationship between the programmed
frequency tuning word and the instantaneous frequency as part
of the locking process.
When CFR[16] = 1, the fast locking algorithm of the PLL 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 single-tone mode.
When CFR[15] = 1, the device is in the frequency sweep mode.
CFR[14]: Enable Sine Output 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 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 section).
CFR[12:11]: Phase Detector Divider Ratio (N)
These bits set the phase detector divide value (see Table 10).
Table 10.
CFR[12:11]
Phase Detector Divider Ratio (N)
Notes
00
1
Default value
01
2
1x
4
LSB ignored
CFR[10]: Charge Pump Polarity 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 PDIN is less than
the frequency at DIVIN. 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 source/sink operation of the
charge pump is opposite that for a ground-referenced VCO.
CFR[9:8]: Phase Detector Divider Ratio (M)
These bits set the phase detector divide value (see Table 11).
Table 11.
CFR[9:8]
Phase Detector Divider Ratio (M)
Notes
00
1
Default value
01
2
1x
4
LSB ignored
CFR[7]: Not Used
CFR[6]: 2 GHz Divider Disable Bit
When CFR[6] = 0 (default), the REFCLK divide-by-2 function
is enabled. 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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9858TLPCB | 制造商:AD 制造商全称:Analog Devices 功能描述:1 GSPS Direct Digital Synthesizer |
| AD9858XSV | 制造商:Analog Devices 功能描述: |
| AD9859 | 制造商:AD 制造商全称:Analog Devices 功能描述:400 MSPS, 10-Bit, 1.8 V CMOS Direct Digital Synthesizer |
| AD9859/PCB | 制造商:Analog Devices 功能描述:NCO, 400MSPS 10 BIT, 1.8V CMOS DIRECT DGTL SYNTHESIZER - Bulk |
| AD9859/PCBZ | 功能描述:BOARD EVAL FOR AD9859 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:AgileRF™ 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081 |
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