參數資料
| 型號： | AD9912ABCPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 9/40頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DDS 1GSPS DAC 14BIT 64LFCSP |
| 產品培訓模塊： | 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 |
| 標準包裝： | 1 |
| 分辨率（位）： | 14 b |
| 主 fclk： | 1GHz |
| 調節(jié)字寬（位）： | 48 b |
| 電源電壓： | 1.8V, 3.3V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-VFQFN 裸露焊盤，CSP |
| 供應商設備封裝： | 64-LFCSP-VQ（9x9） |
| 包裝： | 托盤 |
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AD9912
Rev. F | Page 17 of 40
THEORY OF OPERATION
06
76
3-
03
1
DDS/DAC
FREQUENCY
TUNING WORD
÷S
2×
DIGITAL SYNTHESIS CORE
CONTROL
LOGIC
LOW NOISE
CLOCK
MULTIPLIER
AMP
SYSCLK PORT
EXTERNAL
ANALOG
LOW-PASS
FILTER
EXTERNAL
LOOP
FILTER
DIGITAL
INTERFACE
SYSCLK SYSCLKB
S1 TO S4
FDBK_IN
FDBK_INB
DAC_OUT
DAC_OUTB
OUT
OUTB
OUT_CMOS
CONFIGURATION
LOGIC
Figure 39. Detailed Block Diagram
OVERVIEW
The AD9912 is a high performance, low noise, 14-bit DDS
clock synthesizer with integrated comparators for applications
desiring an agile, finely tuned square or sinusoidal output signal.
A digitally controlled oscillator (DCO) is implemented using a
direct digital synthesizer (DDS) with an integrated output DAC,
clocked by the system clock.
A bypassable PLL-based frequency multiplier is present,
enabling use of an inexpensive, low frequency source for the
system clock. For best jitter performance, the system clock PLL
should be bypassed, and a low noise, high frequency system
clock should be provided directly. Sampling theory sets an upper
bound for the DDS output frequency at 50% of fS (where fS is
the DAC sample rate), but a practical limitation of 40% of
fS is generally recommended to allow for the selectivity of the
required off-chip reconstruction filter.
The output signal from the reconstruction filter can be fed back
to the AD9912 to be processed through the output circuitry.
The output circuitry includes HSTL and CMOS output buffers,
as well as a frequency doubler for applications that need
frequencies above the Nyquist level of the DDS.
The AD9912 also offers preprogrammed frequency profiles that
allow the user to generate frequencies without programming
the part. The individual functional blocks are described in the
following sections.
DIRECT DIGITAL SYNTHESIZER (DDS)
The frequency of the sinusoid generated by the DDS is
determined by a frequency tuning word (FTW), which is a
digital (that is, numeric) value. Unlike an analog sinusoidal
generator, a DDS uses digital building blocks and operates as
a sampled system. Thus, it requires a sampling clock (fS) that
serves as the fundamental timing source of the DDS. The
accumulator behaves as a modulo-248 counter with a program-
mable step size that is determined by the frequency tuning word
(FTW). A block diagram of the DDS is shown in Figure 40.
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| AD9912ABCPZ-REEL7 | 功能描述:IC DDS 1GSPS DAC 14BIT 64LFCSP 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(jié)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) |
| AD9912BCPZ | 制造商:Analog Devices 功能描述:Direct Digital Synthesizer 1000MHz 1-DAC 14-Bit Serial 64-Pin LFCSP EP 制造商:Analog Devices 功能描述:DIRECT DGTL SYNTHESIZER 64LFCSP EP - Trays 制造商:Analog Devices 功能描述:IC DDS 1GSPS 14BIT DAC |
| AD9912BCPZ-REEL7 | 制造商:Analog Devices 功能描述:DIRECT DGTL SYNTHESIZER 64LFCSP EP - Tape and Reel |
| AD9913 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Power 250 MSPS 10-Bit DAC 1.8 V CMOS Direct Digital Synthesizer |
| AD9913/PCBZ | 功能描述:數據轉換 IC 開發(fā)工具 Sub 50mW 250MSPS (+) 10-bit DDS RoHS:否 制造商:Texas Instruments 產品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
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