AD5932 datasheet(19/28 Pages) AD | Programmable Frequency Scan Waveform Generator

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Data Sheet

AD5932

Rev. C | Page 19 of 28

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.

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 Ω

resistor on board. To have a sinusoidal output from the VOUT

pin, set SINE/TRI (Bit D9) in the control register to 1.

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.

VOUT MAX

3p/2

7p/2

p/2

5p/2

9p/2

11p/2

VOUT MIN

Figure 32. Triangle Output

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

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 × TCLOCK

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.

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