EVAL-AD5680DBZ View Datasheet(PDF) - Analog Devices

Part Name

Description

MFG CO.

EVAL-AD5680DBZ

5 V 18-Bit nanoDAC® in a SOT-23

Analog Devices 

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AD5680

APPLICATIONS INFORMATION

CLOSED-LOOP APPLICATIONS

The AD5680 is suitable for closed-loop low bandwidth applica-

tions. Ideally, the system bandwidth acts as a filter on the DAC

output. (See the Filter section for details of the DAC output

prefiltering and postfiltering.) The DAC updates at the

interpolation frequency of 10 kHz.

CONTROLLER

DAC

PLANT

ADC

Figure 32. Typical Closed-Loop Application

FILTER

The DAC output voltage for code transition 4092 to 4094 can be

seen in Figure 33. This is the DAC output unfiltered. Code 4092

does not have any interpolation but Code 4094 has interpolation

with a 50% duty cycle (see Table 5). Figure 34 shows the DAC

output with a 50 Hz passive RC filter and Figure 35 shows the

output with a 300 Hz passive RC filter. An RC combination of

320 kΩ and 10 nF has been used to achieve the 50 Hz cutoff

frequency, and an RC combination of 81 kΩ and 10 nF has

been used to achieve the 300 Hz cutoff frequency.

Data Sheet

∆: 2.09ms

@: 1.28ms

2

1

CODE 4092

CODE 4094

CH1 20.0µV CH2 5V

M 500µs

CH2 1.4V

Figure 34. DAC Output with 50 Hz Filter on Output

∆: 2.09ms

@: 1.28ms

2

1

CODE 4092

CODE 4094

CH1 20.0µV CH2 5V

M 500µs

CH2 1.4V

Figure 35. DAC Output with 300 Hz Filter on Output

CODE 4092

CODE 4094

1

CH1 20.0µV

M 500µs

CH4 0V

Figure 33. DAC Output Unfiltered

Rev. C | Page 14 of 20

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