sorry. i am totally new to such forum and i have problem uploading the thread, that is y i have it all over the web. won't do it again.
by the way, i am using the circuit in the datasheet page 8 (1st diagram).
the circuit is all right when i test it with a square wave signal generator. i believe it is my input problem. the input range is from 1 to 3 v, which mean that it is floating above Zero. i try to connect my input to pin 11 (+)and 1(-)
but i got weird reading. it is at 14v.
by the way, i am using this lm2917 for a flow sensor. the flow sensor output is in term of freqency, therefore i am using it to convert to voltage so i can read the output using an oscilloscope.