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MCA Block Diagram

MCA Block Diagram. Signal. Comparator. Value (t-1). Value (t). Threshold. USB. PIC. Reset. Peak Voltage. Read. ADC. Peak and Hold. MCA Block Diagram. Signal. Comparator. Value (t-1). Pulse width: .1-100 μ s Pulse speed: 100 kcps Pulse height: 0-10 V. Value (t). Threshold.

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MCA Block Diagram

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  1. MCA Block Diagram Signal Comparator Value (t-1) Value (t) Threshold USB PIC Reset Peak Voltage Read ADC Peak and Hold

  2. MCA Block Diagram Signal Comparator Value (t-1) • Pulse width: .1-100 μs • Pulse speed: 100 kcps • Pulse height: 0-10 V Value (t) Threshold USB PIC Reset Peak Voltage Read • PIC: 40 kcps • External: 400 kcps to 20 Mcps ADC Peak and Hold

  3. Testing the PIC ADC • ~40 μs; equivalent to 1/.000040 or 25 kcps • Looking into other ADCs from 400 kcps to 20 Mcps

  4. USB • Case 2 • -High speed • -Bulk transfer • -Can USB keep us with 1 Mcps? • 125 μs microframes • Thirteen 512-byte transactions per microframe • Yes, even at <.8% max rate • Case 1 • -Full speed • -Bulk transfer • -Can USB keep us with 1 Mcps? • 1 ms frames • Nineteen 64-byte transactions per frame • Probably not…requires ~33% max rate • Assumes transfer after 2500 pulses on average • Also, how much time does USB take?

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