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參數資料
| 型號： | AD9952 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | XO, clock |
| 英文描述： | 400 MSPS 14-Bit, 1.8 V CMOS Direct Digital Synthesizer |
| 中文描述： | 400 MSPS的14位，1.8伏的CMOS直接數字頻率合成 |
| 文件頁數： | 17/28頁 |
| 文件大小： | 731K |
| 代理商： | AD9952 |
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AD9952
CFR1<6>: Comparator Power-Down Bit
Rev. 0 | Page 17 of 28
CFR1<6> = 0 (default). The comparator is enabled for operation.
CFR1<6> = 1. The comparator is disabled and is in its lowest
power dissipation state.
CFR1<5>: DAC Power-Down Bit
CFR1<5> = 0 (default). The DAC is enabled for operation.
CFR1<5> = 1. The DAC is disabled and is in its lowest power
dissipation state.
CFR1<4>: Clock Input Power-Down Bit
CFR1<4> = 0 (default). The clock input circuitry is enabled for
operation.
CFR1<4> = 1. The clock input circuitry is disabled and the
device is in its lowest power dissipation state.
CFR1<3>: External Power-Down Mode
CFR1<3> = 0 (default). The external power-down mode
selected is the rapid recovery power-down mode. In this mode,
when the PWRDWNCTL input pin is high, the digital logic
and the DAC digital logic are powered down. The DAC bias
circuitry, PLL, oscillator, and clock input circuitry are not
powered down.
CFR1<3> = 1. The external power-down mode selected is the
full power-down mode. In this mode, when the PWRDWNCTL
input pin is high, all functions are powered down. This includes
the DAC and PLL, which take a significant amount of time to
power up.
CFR1<2>: Not Used
CFR1<1>: SYNC_CLK Disable Bit
CFR1<1> = 0 (default). The SYNC_CLK pin is active.
CFR1<1> = 1. The SYNC_CLK pin assumes a static Logic 0
state to keep noise generated by the digital circuitry at a mini-
mum. However, the synchronization circuitry remains active
(internally) to maintain normal device timing.
CFR1<0>: Not Used, Leave at 0
Control Function Register No. 2 (CFR2)
The CFR2 is used to control the various functions, features, and
modes of the AD9952, primarily related to the analog sections
of the chip.
CFR2<23:12>: Not Used
CFR2<11>: High Speed Sync Enable Bit
CFR2<11> = 0 (default). The high speed sync enhancement is off.
CFR2<11> = 1. The high speed sync enhancement is on. This
bit should be set when attempting to use the auto-
synchronization feature for SYNC_CLK inputs beyond 50 MHz,
(200 MSPS SYSCLK). See the Synchronizing Multiple AD9952s
section for details.
CFR2<10>: Hardware Manual Sync Enable Bit
CFR2<10> = 0 (default). The hardware manual sync function is off.
CFR2<10> = 1. The hardware manual sync function is enabled.
While this bit is set, a rising edge on the SYNC_IN pin will
cause the device to advance the SYNC_CLK rising edge by one
REFCLK cycle. Unlike the software manual sync enable bit, this
bit does not self-clear. Once the hardware manual sync mode is
enabled, it will stay enabled until this bit is cleared. See the
Synchronizing Multiple AD9952s section for details.
CFR2<9>: CRYSTAL OUT Enable Bit
CFR2<9> = 0 (default). The CRYSTAL OUT pin is inactive.
CFR2<9> = 1. The CRYSTAL OUT pin is active. When active,
the crystal oscillator circuitry output drives the CRYSTAL OUT
pin, which can be connected to other devices to produce a refer-
ence frequency. The oscillator will respond to crystals in the
range of 20 MHz to 30 MHz.
CFR2<8>: Not Used
CFR2<7:3>: Reference Clock Multiplier Control Bits
This 5-bit word controls the multiplier value out of the clock-
multiplier (PLL) block. Valid values are decimal 4 to 20 (0x04 to
0x14). Values entered outside this range will bypass the clock
multiplier. See the Phase-Locked Loop (PLL) section for details.
CFR2<2>: VCO Range Control Bit
This bit is used to control the range setting on the VCO.
When CFR2<2> == 0 (default), the VCO operates in a range of
100 MHz to 250 MHz. When CFR2<2> == 1, the VCO operates
in a range of 250 MHz to 400 MHz.
CFR2<1:0>: Charge Pump Current Control Bits
These bits are used to control the current setting on the charge
pump. The default setting, CFR2<1:0>, sets the charge pump
current to the default value of 75 μA. For each bit added (01, 10,
11), 25 μA of current is added to the charge pump current:
100 μA, 125 μA, and 150 μA.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9952/PCB | 制造商:Analog Devices 功能描述:Evaluation Board For Digital Synthesizer 制造商:Analog Devices 功能描述:400 MSPS 14BIT CMOS DIRECT DGTL SYNTHESIZER - Bulk 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD9952YSV | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述:IC DDS 400MSPS SMD 9952 TQFP48 |
| AD9952YSV-REEL7 | 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 |
| AD9952YSVZ | 功能描述:IC DDS 14BIT DAC 1.8V 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) |
| AD9952YSVZ | 制造商:Analog Devices 功能描述:IC DDS 400MSPS SMD 9952 TQFP48 |
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