MN3001 & MN3002 VBB

[armdnrdy]

Since to make the MN3004 and 3010 work in one Ziff socket I have to go the route of a rotary switch to change the clock signal, outputs, and ground of the MN3010 to N/C. for the MN3004,

This thread: http://www.diystompboxes.com/smfforum/index.php?topic=103367.0

I decided to explore the feasibility of adding the MN3001 and MN3002 to the BBD tester's capability.

The thing that's got me is the VBB (back gate bias voltage) requirement for the latter BBD's.

Normally one can fill the negative power requirement of the MN30XX BBD's by supplying VDD pin with ground instead of negative voltage and supply the ground pin with positive voltage. This configuration satisfies the BBD's requirement for it's VDD being more negative than it's ground.

The problem...if I'm reading the data sheet correctly...is in this configuration it seems as if VBB wants to be negative voltage.

I can't seem to find a circuit example of the MN3001 or 3002 being powered in this fashion.
Does anyone know of a circuit that's powered in this manner or have any insight to this issue?

MN3001-2 Data sheet:




       

[Govmnt_Lacky]

Larry,

Im not seeing anything different in the datasheets that you referenced when compared to any of the other MN30XX datasheets. 

It looks like the MN3001/2 chips are still looking for a more "negative" voltage base applied to Vdd than to Vbb.

I think the same applies here. You would apply your negative voltage (in this case 0V/GND) to Pin 11 and then supply your positive voltage (15VDC?) to Pin 1.

this would still be a 15V NEGATIVE difference between the Vdd and Vbb. Same as putting 0V on Pin 1 and -15V on Pin 11. Its it still a 15V negative difference in the correct spots. 

[armdnrdy]

GL, Thanks for the reply

I found a MN3002 circuit powered with positive voltage.......on my PC of all places!

I was looking for a single MN3001 data sheet when the title "MN3002 radio shack delay" caught my eye.

It was as I thought. The MN3001 and 3002 are the two "odd men out" of the MN BBD group.

The normal negative voltage configuration as in the Panasonic data sheet application has the VDD pin at -V, the ground pin at ground, the VGG pin at 1 volt more positive than the VDD pin, and the VBB pin +5 volts more positive than the ground pin.

If you were to power the 3001 or 3002 with positive voltage, the VDD pin at gnd, the ground pin at +V, the VGG pin at 1 volt more positive than the VDD pin, (which in this case would be 1 volt) and the VBB pin at 5 volts more positive than the ground pin. (which in this case would be 5 volts more positive than the positive voltage that is being supplied to ground.

Here is an old scan that I found on the net of the Radio Shack MN3002 application sheet.