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I'm using a apd5100 pressure sensor to monitor arterial line blood pressure. Since its an integrated sensor, i figured i could directly connect it to a 16 bit ADC.However I ain't sure of the choice of ADC for this application...as 1. the sampling rate 2. architecture-SAR/delta sigma 3. Input configuration range
Kindly help me out.
In reply to Tom Hendrick:
any specific reason as to why u suggested this ADC? and is a voltage follower circuit necessary?
Also, if I'm simulating the output signal of the sensor, can I do so by connecting a 5k pot across 5V and gnd and give its output directly to any ADC which then communicates with an MSP430.
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In reply to amj:
No specific reason for the ADS8326 other than its 'ease of use'. Typically a SAR adc wants to see a low impedance input. You may be able to get decent results with the 5K pot depending on your sample rate. In another post to this forum, you are looking for an 8-bit device in a DIP package. Here are a few:
thanks :) do i need to give an anti aliasing filter?
You always need some kind of band-limiting filter before a data converter. Sampling a signal always results in some kind of aliasing, you just need to be sure to keep the aliased signals below the noise floor of the converter. Besides, it's good practice to only use the bandwidth you really need to keep noise low, so limiting the bandwidth of the input signal is the right thing to do.
If you're sampling at 250kSPS, and your pressure signal is a fairly low frequency, then a simple RC filter may be all you need, or you can use FilterPro to design a second-order active filter at whatever your maximum signal frequency might be (100Hz, 500Hz?).
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