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#1
July 24th 03, 11:25 AM
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IC function generator issues
"Tomislav Stimac" wrote in message
om... I have XR2206 function generator IC. Output frequency is is determined by capacitor and resistor. Documentation is clear and test circuit simple. However i cant reach 1 MHz. !! I can't reach above 860 kHz. Component values are exactly as they need to be for 1MHz. What's your R and C? Any parasitic capacitance or inductance (long wires) in your setup? Markus |
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#2
July 24th 03, 11:25 AM
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"Tomislav Stimac" wrote in message
om... I have XR2206 function generator IC. Output frequency is is determined by capacitor and resistor. Documentation is clear and test circuit simple. However i cant reach 1 MHz. !! I can't reach above 860 kHz. Component values are exactly as they need to be for 1MHz. What's your R and C? Any parasitic capacitance or inductance (long wires) in your setup? Markus |
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#3
July 24th 03, 12:42 PM
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"Tomislav Stimac" wrote
I have XR2206 function generator IC. Output frequency is is determined by capacitor and resistor. Documentation is clear and test circuit simple. However i cant reach 1 MHz. !! I can't reach above 860 kHz. Component values are exactly as they need to be for 1MHz. XR2206 datasheet: Maximum Operating Frequency: minimum 0.5MHz (that's what the manufacturer guarantees) typical 1.0MHz (that's what an "average device" will reach with C=1000pF and R1=1k). This means the spread is not primarily in your R and C but in the IC itself! If your design _must_ reach 1.0MHz and you don't have hundreds of ICs to select from, I would not hesitate to reduce R and C by 5...10%. This will increase your f_max by 11...20%. |
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#4
July 24th 03, 12:42 PM
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"Tomislav Stimac" wrote
I have XR2206 function generator IC. Output frequency is is determined by capacitor and resistor. Documentation is clear and test circuit simple. However i cant reach 1 MHz. !! I can't reach above 860 kHz. Component values are exactly as they need to be for 1MHz. XR2206 datasheet: Maximum Operating Frequency: minimum 0.5MHz (that's what the manufacturer guarantees) typical 1.0MHz (that's what an "average device" will reach with C=1000pF and R1=1k). This means the spread is not primarily in your R and C but in the IC itself! If your design _must_ reach 1.0MHz and you don't have hundreds of ICs to select from, I would not hesitate to reduce R and C by 5...10%. This will increase your f_max by 11...20%. |
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