FAQ - ΔΣ Modulator

AK922X 

[Q0101]
・Is it possible to set the sampling frequency of AK9223MK to 20 MHz?
A.
・No, it is not possible.  The maximum sampling rate will be 10 MHz since the AK9223MK internally divides clock (CLKI/2) in external CLK mode.
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Related FAQ

Industrial AFEs & ADCs 

[Q0090]
・Are there any restrictions in power-on sequence? 
A.
・It depends on the product.  Please refer to the 【System Reset】 paragraph in each product datasheet.  If there is no particular description in the datasheet, it does not have a restriction.
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[Q0091]
・Can 2-channel data be sampled at the same time? 
A.
・Yes, it is possible.  Two ADCs are integrated in the device and sampling can be executed simultaneously.
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[Q0092]
・What temperature is the recommended operating temperature described in the data sheet? 
A.
・It is indicating ambient temperature.
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[Q0093]
・Does the thermal pad have to be connected? 
A.
・It depends on the product.  Please refer to the 【Package】 paragraph in the datasheet of each product.
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[Q0094]
・What is the output circuit system? 
A.
・It is CMOS type.  The AK9223MK also supports TTL type.
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[Q0095]
・Is reference design available? 
A.
・Yes, it is.  Please refer to 【Application Notes】 for details.
Click here for details
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[Q0096]
・If the number of decoupling capacitors is reduced from the number shown in the data sheet or if the capacitance value is decreased, is there any effect on the characteristics? 
A.
・Yes, it will affect the characteristics.  We cannot guarantee the characteristics in that case.  Connection example in the datasheet is recommended.
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[Q0097]
・Is it possible to eliminate the low pass filter on the preceding stage of the ADC input? 
A.
・It depends on the product series.
<AK922X,AK923X,AK925X>
No, it is not possible.  Since the RC filter on the preceding stage of the analog input also works as kickback protection from the ADC, it is necessary to exceed the recommended value described in the data sheet. 
<AK924X>
Yes, it is possible.  A 250 kHz LPF is built in as default.  It can be changed to 100 kHz by register setting.  When much lower band LPF is required, it is necessary to set a low pass filter separately at signal input circuit.
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[Q0099]
・Is a simple evaluation tool available? 
A.
・Yes, it is.  Various evaluation boards are available.  Please refer to 【Evaluation Kit】 for details.
Click here for details
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[Q0100]
・Is FPGA source code available? 
A.
・No, we do not provide it at the moment.
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