參數(shù)資料
型號(hào): AD9854/PCBZ
廠商: Analog Devices Inc
文件頁(yè)數(shù): 9/52頁(yè)
文件大?。?/td> 0K
描述: BOARD EVAL FOR AD9854
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
設(shè)計(jì)資源: AD9854 Eval Brd Schematic
AD9854 Eval Brd BOM
標(biāo)準(zhǔn)包裝: 1
系列: AgileRF™
主要目的: 計(jì)時(shí),直接數(shù)字合成(DDS)
已用 IC / 零件: AD9854
已供物品:
相關(guān)產(chǎn)品: AD9854ASTZ-ND - IC DDS QUADRATURE CMOS 80-LQFP
AD9854
Rev. E | Page 17 of 52
VCO
LOOP
FILTER
PHASE
COMPARATOR
REFERENCE
CLOCK
FILTER
AD9854
DDS
TUNING
WORD
REF CLK IN
RF
FREQUENCY
OUT
DAC OUT
PROGRAMMABLE
DIVIDE-BY-N FUNCTION
(WHERE N = 248/TUNING WORD)
00
636
-029
Figure 29. Programmable Fractional Divide-by-N Synthesizer
TUNING
WORD
VCO
LOOP
FILTER
PHASE
COMPARATOR
REF
CLOCK
RF
FREQUENCY
OUT
FILTER
AD9854
DDS
DIVIDE-BY-N
00
63
6-
0
30
Figure 30. Agile High Frequency Synthesizer
PHASE
SPLITTER
Σ
0.8 TO
2.5GHz
AD9854
QUADRATURE
DDS
DDS – LO
LO
DDS
+LO
36dB
TYPICAL
SSB
REJECTION
50
VOUT
AD8346 QUADRATURE
MODULATOR
90
COSINE (DC TO 70MHz)
SINE (DC TO 70MHz)
LO
0
0
06
36-
0
31
NOTES
1. FLIP DDS QUADRATURE SIGNALS TO SELECT ALTERNATE SIDEBAND. ADJUST DDS
SINE OR COSINE SIGNAL AMPLITUDE FOR GREATEST SIDEBAND SUPPRESSION.
DDS DAC OUTPUTS MUST BE LOW-PASS FILTERED PRIOR TO USE WITH THE AD8346.
Figure 31. Single Sideband Upconversion
REFERENCE
CLOCK
50
1:1 TRANSFORMER
(Mini-Circuits T1-1T)
FILTER
50
DIFFERENTIAL
TRANSFORMER-COUPLED
OUTPUT
AD9854
DDS
IOUT
00
636
-03
2
Figure 32. Differential Output Connection for Reduction of Common-Mode Signals
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