參數(shù)資料
型號(hào): AD9911/PCBZ
廠商: Analog Devices Inc
文件頁數(shù): 20/44頁
文件大?。?/td> 0K
描述: BOARD EVAL FOR AD9911
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: AD9911 Eval Brd Schematics
AD9911 Eval Brd BOM
AD9911 Eval Brd Gerber Files
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: AD9911
已供物品:
相關(guān)產(chǎn)品: AD9911BCPZ-REEL7-ND - IC DDS 500MSPS DAC 10BIT 56LFCSP
AD9911BCPZ-ND - IC DDS 500MSPS DAC 10BIT 56LFCSP
AD9911
Rev. 0 | Page 27 of 44
05
78
5-
0
54
SYNC_CLK
SYNC
CLOCK
DDS CORE
AMPLITUDE
MULTIPLIER ENABLE
ACR <12>
0
1
0
1
01
HOLD
INC/DEC EN
OUT
COS(X)
UP/DN
DATA
LOAD
EN
LINEAR SWEEP
ACCUMULATOR
PROFILE/SDIO_1:3
PINS
8
8-BIT BINARY
DOWN
COUNTER
10-BIT BINARY
UP/DOWN
COUNTER
INCREMENT/
DECREMENT
STEP SIZE
ACR <15:14>
TEST TONE
MODULATION
MUX
10
AMPLITUDE SCALE
FACTOR
REGISTER
(ACR) <0:9>
DAC
2
PROFILE REGISTERS
FOR
ASK MODULATION
MANUAL
RAMP UP/DOWN
(RU/RD)
AUTO RAMP
UP/DOWN
(RU/RD)
RAMP UP/DOWN
(RU/RD)
ENABLE
ACR <11>
LOAD ARR
TIMER
BIT ACR <10>
AMPLITUDE
RAMP RATE
REGISTER
(ACR BITS <23:16>)
Figure 46. Output Amplitude Control Configurations
Ramp Rate Timer
The ramp rate timer is a loadable 8-bit down counter. It
generates the clock signal to the 10-bit counter, which in turn
generates the internal scale factor. The formula for calculating
the amplitude ramp rate time is
( )
)
(
_
/
Hz
CLK
SYNC
x
t =
Δ
Where x is the decimal value in Register 00x06 Bits <23:16>.
At 500 MSPS operation (SYNC_CLK =125 MHz), the
minimum time interval between steps is 1/125 MHz × 1 = 8 ns.
The maximum time interval is (1/125 MHz) × 255 = 2.04 μs.
The ramp rate timer is loaded with the value of the ASF every
time the counter reaches 1 (decimal). This load and count down
operation continues for as long as the timer is enabled unless
the timer is forced to load before reaching a count of 1.
If the load ARR timer bit ACR <10> is set, the ramp rate timer
is loaded if any of the following three incidents transpire: an I/O
update occurs, a profile pin changes, or the timer reaches a
See through Table 13 through Table 18 for RU/RD pin
assignments.
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