AD7840ARS Analog Devices Inc, AD7840ARS Datasheet - Page 9

• Manufacturer Part Number: AD7840ARS
• Description: IC DAC 14BIT LOW POWER 5V 24SSOP
• Manufacturer: Analog Devices Inc

Specifications of AD7840ARS

• Rohs Status: RoHS non-compliant
• Settling Time: 2.5µs
• Number Of Bits: 14
• Data Interface: Serial, Parallel
• Number Of Converters: 1
• Voltage Supply Source: Dual ±
• Power Dissipation (max): 100mW
• Operating Temperature: -25°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SSOP

REV. B
The digitizer sampling is synchronized with the AD7840 update
rate to ease FFT calculations. The digitizer samples the
AD7840 after the output has settled to its new value. Therefore,
if the digitizer was to sample the output directly it would effec-
tively be sampling a dc value each time. As a result, the dynamic
performance of the AD7840 would not be measured correctly.
Using the digitizer directly on the AD7840 output would give
better results than the actual performance of the AD7840. Us-
ing a filter between the DAC and the digitizer means that the
digitizer samples a continuously moving signal and the true dy-
namic performance of the AD7840 is measured.
Some applications will require improved performance versus fre-
quency from the AD7840. In these applications, a simple
sample-and-hold circuit such as that outlined in Figure 12 will
extend the very good performance of the AD7840 to 20 kHz.
Other applications will already have an inherent sample-and-
hold function following the AD7840. An example of this type of
application is driving a switched-capacitor filter where the up-
dating of the DAC is synchronized with the switched-capacitor
filter. This inherent sample-and-hold function also extends the
frequency range performance of the AD7840.
Figure 11. AD7840 Dynamic Performance Test Circuit
Figure 12. Sample-and-Hold Circuit
–9–
Performance versus Frequency
The typical performance plots of Figures 13 and 14 show the
AD7840’s performance over a wide range of input frequencies
at an update rate of 100 kHz. The plot of Figure 13 is without a
sample-and-hold on the AD7840 output while the plot of Figure
14 is generated with the sample-and-hold circuit of Figure 12 on
the output.
Figure 13. Performance vs. Frequency
(No Sample-and-Hold)
Figure 14. Performance vs. Frequency
(with Sample-and-Hold)
AD7840