- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373971 > AD9953 (Analog Devices, Inc.) 400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer PDF資料下載
參數(shù)資料
| 型號： | AD9953 |
| 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(shù)字頻率合成器 |
| 文件頁數(shù)： | 41/42頁 |
| 文件大?。?/td> | 473K |
| 代理商： | AD9953 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁當前第41頁第42頁
PRELIMINARY TECHNICAL DATA
Notes on Serial Port Operation
1) The AD9953 serial port configuration bits reside in bits 8 and 9 of CFR1 (address 00h). The
configuration changes immediately upon writing to this register. For multi-byte transfers,
writing to this register may occur during the middle of a communication cycle. Care must be
taken to compensate for this new configuration for the remainder of the current
communication cycle.
2) The system must maintain synchronization with the AD9953 or the internal control logic
will not be able to recognize further instructions. For example, if the system sends an
instruction byte that describes writing a 2-byte register, then pulses the SCLK pin for a 3-
byte write (24 additional SCLK rising edges), communication synchronization is lost. In this
case, the first 16 SCLK rising edges after the instruction cycle will properly write the first
two data bytes into the AD9953, but the next eight rising SCLK edges are interpreted as the
next instruction byte, not the final byte of the previous communication cycle. In the case
where synchronization is lost between the system and the AD9953, the SYNC I/O pin
provides a means to re-establish synchronization without re-initializing the entire chip. The
SYNC I/O pin enables the user to reset the AD9953 state machine to accept the next eight
SCLK rising edges to be coincident with the instruction phase of a new communication
cycle. By applying and removing a “high” signal to the SYNC I/O pin, the AD9953 is set to
once again begin performing the communication cycle in synchronization with the system.
Any information that had been written to the AD9953 registers during a valid
communication cycle prior to loss of synchronization will remain intact.
3) Reading profile registers requires that the profile select pins (Profile<1:0>) be configured to
select the desired register bank. When reading a register that resides in one of the profiles,
the register address acts as an offset to select one of the registers among the group of
registers defined by the profile. While the profile select pins select the appropriate register
group.
AD9953
Power Down Functions of the AD9953
The AD9953 supports an externally controlled, or hardware, power down feature as well as the
more common software programmable power down bits found in previous ADI DDS products.
The software control power down allows the DAC, Comparator, PLL, Input Clock circuitry and
the digital logic to be individually power down via unique control bits (CFR1<7:4>). With the
exception of CFR1<6>, these bits are not active when the externally controlled power down pin
(PwrDwnCtl) is high. External Power Down Control is supported on the AD9953 via the
PwrDwnCtl input pin. When the PwrDwnCtl input pin is high, the AD9953 will enter a power
down mode based on the CFR1<3> bit. When the PwrDwnCtl input pin is low, the external power
down control is inactive.
REV. PrB 1/30/03
Page 41
Analog Devices, Inc.
相關PDF資料 |
PDF描述 |
|---|---|
| AD9953ASV | 400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer |
| AD9953PCB | 400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer |
| 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 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD9953/PCB | 制造商:Analog Devices 功能描述:400 MSPS, 14BIT DGTL SYNTHESIZER - Bulk |
| AD9953ASV | 制造商:AD 制造商全稱:Analog Devices 功能描述:400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer |
| AD9953PCB | 制造商:AD 制造商全稱:Analog Devices 功能描述:400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer |
| 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。