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参数资料
| 型号： | EVAL-AD5930EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD5930 |
| 标准包装： | 1 |
| 主要目的： | 计时，波形发生器 |
| 已用 IC / 零件： | AD5930 |
| 次要属性： | 串行接口 |
| 已供物品： | 板，线缆 |
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AD5930
Data Sheet
Rev. | Page 16 of 28
THEORY OF OPERATION
The AD5930 is a general-purpose synthesized waveform
generator capable of providing digitally programmable
waveform sequences in both the frequency and time domain.
The device contains embedded digital processing to provide a
repetitive sweep of a user programmable frequency profile
allowing enhanced frequency control. Because the device is pre-
programmable, it eliminates continuous write cycles from a
DSP/μcontroller in generating a particular waveform.
THE FREQUENCY PROFILE
The frequency profile is defined by the start frequency (FSTART),
the frequency increment (Δf) and the number of increments
per sweep (NINCR). The increment interval between frequency
increments, tINT, is either user programmable with the interval
automatically determined by the device (auto-increment mode),
or externally controlled via a hardware pin (external increment
mode). For automatic update, the interval profile can either be
for a fixed number of clock periods or for a fixed number of
output waveform cycles.
In the auto-increment mode, a single pulse at the CTRL pin starts
and executes the frequency sweep. In the external increment
mode, the CTRL pin also starts the sweep, but the frequency
increment interval is determined by the time interval between
sequential 0/1 transitions on the CTRL pin. Furthermore, the
CTRL pin can be used to directly control the burst profile, where
during the input high time, the output waveform is present, and
during the input low time, the output is reset to midscale.
The frequency profile can be swept in two different modes: saw
sweep or triangular (up/down) sweep.
Saw-Sweep Mode
In the case of a saw sweep, the AD5930 repeatedly
sweeps between sweep start to sweep end, that is, from
FSTART incrementally to
FSTART + NINCR × Δf
This gives a saw-sweep cycle time of
(NINCR + 1) × tINT
FSTART
FSTART + F
FSTART + NINCR × F
MIDSCALE
05333-
009
Figure 31. Saw-Sweep Profile
Triangular-Sweep Mode
In the case of a triangular sweep, the AD5930 repeatedly
sweeps between sweep start to sweep end, that is, from FSTART
incrementally to
FSTART + NINCR × Δf
The triangular-sweep cycle time is given by
(1 + (2 × NINCR)) × tINT
FSTART
05333-
010
FSTART
FSTART + F
FSTART + NINCR × F
MIDSCALE
Figure 32. Triangular-Sweep Profile
OUTPUT MODES
The AD5930 offers two possible output modes: continuous
output mode and burst output mode. Both of these modes are
illustrated in Figure 33.
05333-
0
1
CONTINUOUS
MODE
BURST
MODE
1
2
NUMBER STEP CHANGES
tINT
TBURST
Figure 33. Continuous Mode and Burst Mode of the AD5930
Continuous Output Mode
In this mode, each frequency of the sweep is available for the
length of time programmed into the time interval (tINT) register.
This means the frequency swept output signal is continuously
available, and is therefore phase continuous at all frequency
increments.
To set up the AD5930 in continuous mode, the CW/BURST bit
(D7) in the control register must be set to 0. See the Activating
and Controlling the Sweep section for more details.
Burst Output Mode
In this mode, the AD5930 provides a programmable burst
of the waveform output for a fixed length of time (TBURST)
within the programmed increment interval (tINT). Then for
the remainder of the tINT interval, the output is reset to mid-
scale and remains there until the next frequency increment.
B
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