EVAL-AD7739EBZ Analog Devices Inc, EVAL-AD7739EBZ Datasheet - Page 28
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EVAL-AD7739EBZ
Manufacturer Part Number
EVAL-AD7739EBZ
Description
BOARD EVAL FOR AD7739
Manufacturer
Analog Devices Inc
Datasheet
1.AD7739BRUZ.pdf
(32 pages)
Specifications of EVAL-AD7739EBZ
Number Of Adc's
1
Number Of Bits
24
Sampling Rate (per Second)
15.1k
Data Interface
Serial
Inputs Per Adc
8 Single Ended
Input Range
±2.5 V
Power (typ) @ Conditions
85mW @ 5 V
Voltage Supply Source
Analog and Digital
Operating Temperature
-40°C ~ 105°C
Utilized Ic / Part
AD7739
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
AD7739
FREQUENCY RESPONSE
The sigma-delta modulator runs at ½ the MCLK frequency,
which is effectively the sampling frequency. Therefore, the
modulator Nyquist frequency is ¼ of the MCLK.
If chopping is enabled, the input signal is resampled by
chopping. Therefore, the overall frequency response features
notches close to the frequency of 1/channel conversion time.
–100
–120
–100
–120
–20
–40
–60
–80
–20
–40
–60
–80
Figure 27. Typical ADC Frequency Response, Chopping Disabled
Figure 26. Typical ADC Frequency Response, Chopping Enabled
0
0
0
0
CHOP = 1
CHOP = 0
(INPUT FREQUENCY × CONVERSION TIME)
(INPUT FREQUENCY × CONVERSION TIME)
NORMALIZED INPUT FREQUENCY
NORMALIZED INPUT FREQUENCY
Rev. 0 | Page 28 of 32
1
1
The typical ADC frequency response plots are given in
Figure 26 and Figure 27. The plots are normalized to 1/channel
conversion time.
Note that these figures apply to each channel separately and are
based on individual channel conversion time. The signal is
effectively resampled once more in the multiplexer by switching
between enabled analog inputs.
10
10
Preliminary Technical Data
100
100
03742-0-026
03742-0-027