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參數資料
| 型號： | AD9910BSVZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | 1 GSPS, 14-Bit, 3.3 V CMOS Direct Digital Synthesizer |
| 中文描述： | SERIAL, PARALLEL, WORD INPUT LOADING, 14-BIT DAC, PDSO100 |
| 封裝： | ROHS COMPLIANT, MS-026AED-HD, TQFP-100 |
| 文件頁數： | 17/60頁 |
| 文件大?。?/td> | 764K |
| 代理商： | AD9910BSVZ-REEL |
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AD9910
RAM MODULATION MODE
The RAM modulation mode (see Figure 23) is activated via the
RAM enable bit and assertion of the I/O_UPDATE pin (or a
profile change). In this mode, the modulated DDS signal
control parameters are supplied directly from RAM.
Rev. 0 | Page 17 of 60
The RAM consists of 32-bit words and is 1024 words deep.
Coupled with a sophisticated internal state machine, the RAM
provides a very flexible method for generating arbitrary, time
dependent waveforms. A programmable timer controls the rate
at which words are extracted from the RAM for delivery to the
DDS. Thus, the programmable timer establishes a sample rate at
which 32-bit samples are supplied to the DDS.
The selection of the specific DDS signal control parameters that
serve as the destination for the RAM samples is also programmable
through eight independent RAM profile registers. Select a par-
ticular profile using the three external profile pins (PROFILE<2:0>).
A change in the state of the profile pins with the next rising
edge on SYNC_CLK activates the selected RAM profile.
In RAM modulation mode, the ability to generate a time
dependent amplitude, phase, or frequency signal enables
modulation of any one of the parameters controlling the DDS
carrier signal. Furthermore, a polar modulation format is
available that partitions each RAM sample into a magnitude
and phase component; 16 bits allocated to phase and 14 bits
allocated to magnitude.
0
16
PARALLEL
INPUT
PDCLK
SCLK
SDIO
I/O_RESET
PROFILE
I/O_UPDATE
RAM
POWER
DOWN
CONTROL
E
DAC_RSET
IOUT
IOUT
CS
TxENABLE
DAC FSC
OSK
A
θ
INVERSE
SINC
FILTER
CLOCK
AMPLITUDE (A)
FREQUENCY (
ω
)
PHASE (
θ
)
DIGITAL
RAMP
GENERATOR
8
DAC FSC
8
2
2
MULTICHIP
SYNCHRONIZATION
SYSCLK
PLL
÷2
C
REF_CLK
REF_CLK
REFCLK_OUT
XTAL_SEL
PARALLEL DATA
TIMING AND
CONTROL
S
2
AD9910
PROGRAMMING
REGISTERS
OUTPUT
SHIFT
KEYING
DATA
ROUTE
AND
PARTITION
CONTROL
3
INTERNAL CLOCK TIMING
AND CONTROL
ω
Acos (
ω
t+
θ
)
Asin (
ω
t+
θ
)
S
S
S
P
P
M
2
2
DDS
AUX
DAC
8-BIT
DAC
14-BIT
RAM_SWP_OVR
DRCTL
DRHOLD
DROVER
S
Figure 23. RAM Modulation Mode
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