Frequency to Voltage Converter LM2917N(14pin) HELP!

[electro]

im trying to explore the operation of the chip in zener regulated F>V
circuit with 250mVpp @ 1khz,12V Vcc as prescirbed in the datasheet.my
threshold levels are rated +-50mVpp so im quite sure that proper output
Voh(8.3) and Vol(2.3) shoudl be produced at pin 2 or 3...
my R1 is 100k C1 is 20nF and C2 is 1uF and a 10k transistor
output(pin5)...

my problem is:

1.my reading at pin 2 is 580 mVdc max
2.my reading at pin 3 is 520mVdc max
-> shouldnt it be equal to ic x R1 = 185uA x 100k = 18.5V where my ic
or I2=I3 is rated to be about 185uA @ 25degree celsius as based from
the datasheet graph
3.my reading at pin 5 is 420mVdc max
-> the output voltage which says Vout = 66Hz/volt is nowhere to be
attained. changing the input frequency from my function gen. doesnt
alter the Vout in anyway...why?
4.my application is in metal detedector. i have a lc tuned oscillator
and i want to use the frequency change as my indicator of metal
presence as opposed to "mixing"...or dou you have any other way to do
this? meaning a simple switch in which when a certain threshold
frequency is attained, it outputs a certain voltge level?

thanks!
help please!


datasheet is here:http://www.national.com/pf/LM/LM2917.html

 

[electro]

im sorry..i forgot to connect pin 12 to ground..the new values are
still problematic for me

pin5=pin4 : 80mV max
pin3 = 80mV max
pin2= 80mV max

 

[Andrew Holme]

im trying to explore the operation of the chip in zener regulated F>V
circuit with 250mVpp @ 1khz,12V Vcc as prescirbed in the datasheet.my
threshold levels are rated +-50mVpp so im quite sure that proper output
Voh(8.3) and Vol(2.3) shoudl be produced at pin 2 or 3...
my R1 is 100k C1 is 20nF and C2 is 1uF and a 10k transistor
output(pin5)...

[snip]

Are you referring to the zener regulated circuit on datasheet page 9? Pin 5
is connected to Vcc and output is taken across the 10k resistor from pin 4
to ground. Note: pin 4 is also connected to pin 7.

BTW Multi-posting is much better than cross-posting because answers posted
in one group automatically appear in the other(s); and you don't have to
type your question twice.

 

[electro]

yes.im referring to the 14pin lm2917 chip.
pin 5 and 10 is connected and then series with a 10k resistor.