AD5932 datasheet(19/28 Pages) AD

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AD5932

Rev. 0 | Page 19 of 28

VOUT MAX

3p/2

7p/2

p/2

5p/2

9p/2

11p/2

VOUT MIN

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.

Figure 32. Triangle Output

Digital Outputs

Analog Outputs

Square-Wave Output from MSBOUT

Sinusoidal Output

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.

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.

DVDD

DGND

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.

Figure 33. MSB Output

SYNCOUT Pin

Triangle Output

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

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.

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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