參數(shù)資料
型號(hào)： AD9852AST
廠商： ANALOG DEVICES INC
元件分類(lèi)： XO, clock
英文描述： CMOS 300 MHz Complete-DDS
中文描述： PLL FREQUENCY SYNTHESIZER, 20 MHz, PQFP80
封裝： MS-026BEC, LQFP-80
文件頁(yè)數(shù)： 17/42頁(yè)
文件大?。?/td> 424K
代理商： AD9852AST
AD9852
–17–
REV. 0
Single-Tone (Mode 000)
This is the default mode when master reset is asserted or when
it is user-programmed into the control register. The Phase
Accumulator, responsible for generating an output frequency, is
presented with a 48-bit value from Frequency Tuning Word 1
registers whose default values are zero. Default values from the
remaining applicable registers will further define the single-tone
output signal qualities.
The default values after a master reset, define a safe, “no output”
value resulting in an output signal of 0 Hertz, 0 phase. Upon
power-up and reset the output from both I and Q DACs will be
a dc value equal to the midscale output current. This is the
default mode amplitude setting of zero. Refer to the digital multi-
plier section for further explanation of the output amplitude
control. It will be necessary to program all or some of the 28
program registers to realize a user-defined output signal.
Figure 35 graphically shows the transition from the default con-
dition (0 Hz) to a user-defined output frequency (F1).
As with all Analog Devices DDSs, the value of the frequency
tuning word is determined using the following equation:
FTW = (Desired Output Frequency
×
2
N
)/SYSCLK.
000 (SINGLE TONE)
MODE
F1
TW1
000 (DEFAULT)
0
F1
0
F
Figure 35. Default State to User-Defined Output Transition
Where
N
is the phase accumulator resolution (48 bits in this
instance), frequency is expressed in Hertz, and the FTW,
Frequency Tuning Word, is a decimal number. Once a decimal
number has been calculated, it must be rounded to an integer
and then converted to binary format—a series of 48 binary-
weighted 1s or 0s. The fundamental sine wave DAC output
frequency range is from dc to 1/2 SYSCLK.
Changes in frequency are phase continuous—that is, the new
frequency uses the last phase of the old frequency as the reference
point to compute the first new frequency phase.
The single-tone mode allows the user to control the following
signal qualities:
Output Frequency to 48-Bit Accuracy
Output Amplitude to 12-Bit Accuracy
– Fixed, User-Defined, Amplitude Control
– Variable, Programmable Amplitude Control
– Automatic, Programmable, Single-Pin-Controlled, “Shaped
On/Off Keying”
Output Phase to 14-Bit Accuracy
Furthermore, all of these qualities can be changed or modulated
via the 8-bit parallel programming port at a 100 MHz parallel-byte
rate, or at a 10 MHz serial rate. Incorporating this attribute will
permit FM, AM, PM, FSK, PSK, ASK operation in the single-
tone mode.
Table III. Function Availability vs. Mode of Operation
Single-Pin
FSK/BPSK
or HOLD
Single-Pin
Shaped-
Keying
Phase
Offset or
Modulation
Amplitude
Control or
Modulation
Inverse
SINC
Filter
Frequency Frequency Automatic
Tuning
Tuning
Word 1
Word 2
Phase
Adjust 1
Phase
Adjust 2
Frequency
Sweep
Mode
Single-Tone
FSK
Ramped FSK
CHIRP
BPSK
X
X
X
X
X
X
X
X
X
X
X
X
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AD9852ASTZ 制造商:Analog Devices 功能描述:IC DDS 100MHZ LQFP-80
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AD9852ASVZ 制造商:Analog Devices 功能描述:IC DDS 300MHz TQFP-80 制造商:Analog Devices 功能描述:IC, DDS, 300MHz, TQFP-80
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