參數(shù)資料
型號(hào)： AD9854ASTZ
廠商： Analog Devices Inc
文件頁數(shù)： 5/52頁
文件大?。?/td> 0K
描述： IC DDS QUADRATURE CMOS 80-LQFP
產(chǎn)品培訓(xùn)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(biāo)準(zhǔn)包裝： 1
分辨率（位）： 12 b
主 fclk： 300MHz
調(diào)節(jié)字寬（位）： 48 b
電源電壓： 3.14 V ~ 3.47 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 80-LQFP
供應(yīng)商設(shè)備封裝： 80-LQFP（14x14）
包裝： 托盤
產(chǎn)品目錄頁面： 552 (CN2011-ZH PDF)
配用： AD9854/PCBZ-ND - BOARD EVAL FOR AD9854
AD9854
Rev. E | Page 13 of 52
Figure 10 to Figure 15 show the trade-off in elevated noise floor, increased phase noise (PN), and discrete spurious energy when the internal
REFCLK multiplier circuit is engaged. Plots with wide (1 MHz) and narrow (50 kHz) spans are shown. Compare the noise floor of
Figure 11 and Figure 12 with that of Figure 14 and Figure 15. The improvement seen in Figure 11 and Figure 12 is a direct result of
sampling the fundamental at a higher rate. Sampling at a higher rate spreads the quantization noise of the DAC over a wider bandwidth,
which effectively lowers the noise floor.
0
CENTER 39.1MHz
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
100kHz/
SPAN 1MHz
0
06
36-
0
10
Figure 10. Narrow-Band SFDR, 39.1 MHz, 1 MHz BW,
300 MHz REFCLK with REFCLK Multiplier Bypassed
0
CENTER 39.1MHz
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
5kHz/
SPAN 50kHz
00
636
-011
Figure 11. Narrow-Band SFDR, 39.1 MHz, 50 kHz BW,
300 MHz REFCLK with REFCLK Multiplier Bypassed
0
CENTER 39.1MHz
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
5kHz/
SPAN 50kHz
006
36
-0
14
Figure 12. Narrow-Band SFDR, 39.1 MHz, 50 kHz BW,
100 MHz REFCLK with REFCLK Multiplier Bypassed
0
CENTER 39.1MHz
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
100kHz/
SPAN 1MHz
00
63
6-
01
2
Figure 13. Narrow-Band SFDR, 39.1 MHz, 1 MHz BW,
30 MHz REFCLK with REFCLK Multiplier = 10×
0
CENTER 39.1MHz
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
5kHz/
SPAN 50kHz
00
63
6-
0
1
3
Figure 14. Narrow-Band SFDR, 39.1 MHz, 50 kHz BW,
30 MHz REFCLK with REFCLK Multiplier = 10×
0
CENTER 39.1MHz
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
5kHz/
SPAN 50kHz
006
36
-0
15
Figure 15. Narrow-Band SFDR, 39.1 MHz, 50 kHz BW,
10 MHz REFCLK with REFCLK Multiplier = 10×
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