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AD7403BRIZ-RL7 Datasheet(PDF) 22 Page - Analog Devices

Part # AD7403BRIZ-RL7
Description  16-Bit, Isolated Sigma-Delta Modulator
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7403BRIZ-RL7 Datasheet(HTML) 22 Page - Analog Devices

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Data Sheet
AD7403
Rev. B | Page 21 of 24
INTERFACING TO ADSP-CM4xx
The ADSP-CM4xx family of mixed-signal control processors
contains on-chip sinc filter and clock generation modules for
direct connection to the AD7403 MCLKIN and MDAT pins.
The ADSP-CM4xx can process bit streams from four AD7403
devices using a pair of configurable sinc filters for each bit stream.
The primary sinc filter of each pair produces the filtered and
decimated output for the pair. The output can be decimated to
any integer rate between 8 and 256 times lower than the input
rate. The four secondary sinc filters are low latency filters with
programmable positive and negative overrange detection
comparators that can be used to detect system fault conditions
Figure 40 shows the typical interface between the AD7403 and
the ADSP-CM4xx. Additional information on the configuration of
the sinc filter modules in the ADSP-CM4xx can be found in the
AN-1265 Application Note.
SINC PAIR n
PRIMARY
SECONDARY
LIMIT
CONTROL FOR GROUP n
MODULATOR CLOCK n
ADSP-CM4xx1
AD74031
MDAT
MCLKIN
SINC0_CLK0
SINC0_D0
1ADDITIONAL PINS OMITTED FOR CLARITY
Figure 40. Interfacing the AD7403 to the ADSP-CM4xx
POWER SUPPLY CONSIDERATIONS
The AD7403 requires a 5 V VDD1 supply, and there are various
means of achieving this. One method is to use an isolated dc-to-
dc converter such as the ADuM6000. This method provides a 5 V
regulated dc supply across the isolation barrier. Note that the
inherent isolation of the ADuM6000 is lower than the AD7403.
5V DIGITAL
ISOLATION
BARRIER
VDD1
VDD2
5V ISO
Figure 41. ADuM6000 Isolated 5 V DC-to-DC Regulator Example
Another method is to regulate a dc supply on the high voltage
side of the isolation barrier using a step-down dc-to-dc regulator,
such as the ADP2441.
VDD2
VDD1
5V DIGITAL
5V
4.5V TO 36V
ADP2441
DC-TO-DC
SWITCHING
REGULATOR
ISOLATION
BARRIER
Figure 42. ADP2441 Step-Down DC-to-DC Regulator Example
GROUNDING AND LAYOUT
It is recommended to decouple the VDD1 supply with a 10 μF
capacitor in parallel with a 1 nF capacitor to GND1. Decouple
Pin 1 and Pin 7 individually. Decouple the VDD2 supply with a
100 nF value to GND2. In applications involving high common-
mode transients, ensure that board coupling across the isolation
barrier is minimized. Furthermore, design the board layout so
that any coupling that occurs equally affects all pins on a given
component side. Failure to ensure equal coupling can cause
voltage differentials between pins to exceed the absolute maximum
ratings of the device, thereby leading to latch-up or permanent
damage. Place any decoupling used as close to the supply pins as
possible.
Minimize series resistance in the analog inputs to avoid any
distortion effects, especially at high temperatures. If possible,
equalize the source impedance on each analog input to minimize
offset. Check for mismatch and thermocouple effects on the analog
input printed circuit board (PCB) tracks to reduce offset drift.
INSULATION LIFETIME
All insulation structures eventually break down when subjected
to voltage stress over a sufficiently long period. The rate of
insulation degradation is dependent on the characteristics of
the voltage waveform applied across the insulation. In addition
to the testing performed by the regulatory agencies, Analog
Devices carries out an extensive set of evaluations to determine
the lifetime of the insulation structure within the AD7403.
Analog Devices performs accelerated life testing using voltage
levels higher than the rated continuous working voltage.
Acceleration factors for several operating conditions are
determined. These factors allow calculation of the time to
failure at the actual working voltage. The values shown in Table 9
summarize the peak voltage for 20 years of service life for a
bipolar, ac operating condition and the maximum VDE
approved working voltages.


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