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AD5932 Datasheet

  • AD5932

  • Programmable Single-Scan Waveform Generator

  • 17頁

  • AD

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AD5932
OUTPUTS FROM THE AD5932
The AD5932 offers a variety of outputs from the chip. The analog
outputs are available from the VOUT pin and include a sine
wave and a triangle output. The digital outputs are available
from the MSBOUT pin and the SYNCOUT pin.
VOUT MAX
p/2
5p/2
9p/2
05416-032
VOUT MIN
3p/2
7p/2
11p/2
Figure 32. Triangle Output
Analog Outputs
Sinusoidal Output
The SIN ROM is used to convert the phase information from
the frequency register into amplitude information, resulting in
a sinusoidal signal at the output.
The AD5932 includes a 10-bit, high impedance, current source
DAC that is configured for single-ended operation. An external
load resistor is not required because the device has a 200 惟
resistor on board. To have a sinusoidal output from the VOUT
pin, set SINE/TRI (Bit D9) in the control register to 1.
Digital Outputs
Square-Wave Output from MSBOUT
The inverse of the MSB from the NCO can be output from the
AD5932. By setting MSBOUTEN (Bit D8) to 1, the inverted
MSB of the DAC data is available at the MSBOUT pin. This is
useful as a digital clock source.
DVDD
05416-040
DGND
Figure 33. MSB Output
SYNCOUT Pin
The SYNCOUT pin can be used to give the status of the scan.
It is user-selectable for the end of scan or to output a 4 脳 T
CLOCK
pulse at frequency increments. The timing information for both
of these modes is shown in Figure 6.
The SYNCOUT pin must be enabled before use. This is done
using Bit D2 in the control register. The output available from
this pin is then controlled by Bit D3 in the control register.
See Table 6 for more information.
Triangle Output
The SIN ROM can be bypassed so that the truncated digital
output from the NCO is sent to the DAC. In this case, the
output is no longer sinusoidal. The DAC produces a 10-bit
linear triangular function. To have a triangle output from the
VOUT pin, set SINE/TRI (Bit D9) to 0. Note that DAC
ENABLE (Bit D10) must be set to 1 (that is, the DAC is
enabled) when using this pin.
Rev. 0 | Page 19 of 28

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