Hi, I'm trying to find the best ADC for my application, as follows:
* I have a suite of analog sensors for inertial navigation
* 3-axis analog gyro, 3-axis analog accelerometer, 3-axis analog magnetometer
* I need a 9 channels of ADC (or 6 channels if I exclude the magnetometer)
* At most 1kHz sampling rate
* 16-bits resolution
* SPI interface to Freescale K60 microcontroller.
* Single-ended analog inputs from 0-3.3 V.
* Prefer simultaneous sampling
I'm considering analog sensors because the cell-phone/consumer grade integrated chips are not good enough for our application. We are closer to an industrial/automotive application where performance is more important than cost, space, or power consumption; ie we need 0.1 degree orientation accuracy at rather slow rotation rates (up to 20 degrees per second). For this type of application I'm finding single-axis analog components to be more readily available than integrated 3, 6, or 9 axis components. Therefore I'm considering just building up my own 6 or 9-axis sensor suite and doing a system-level calibration over temperature.
In the cases where I find a multi-channel ADC, it seems the interface is for DSP, or the range is not quite 0-3.3 V.
Our total sensor suite needs to be << $100, so the modules from ADI are out of our price range.
Can someone please help guide me toward the right solution?