I talked to Glen Miller, the sales rep for MuRata.  He would like to obtain
pricing.  What was the small quantity that you wanted to order now?  What production
quantities would you like pricing for?  The question came up as to which values are
matched to 0.25%; we assume that 1K's are matched to each other and that 2K's are
matched to each other.  Am I correct is assuming that the 1K's and 2K's are matched
to each other also?  He said that these would have to be special ordered since none
of the resistors are matched to 0.25%.

		erwin

Irwin, I am sending you a copy of my correspondance on the R2R Ladder Network.

The question of what matches within 0.25% has never come up before. In order

for this thing to work, each "R" must be within 0.25% of every other "R".

Since "R" is nominally 1K, 0.25% is 2.5 ohms so that each "R" is plus or minus

2.5 Ohms and each "2R" is plus or minus 5.0 Ohms. If the "R"s don't track

with the "2R"s, it doesn't work. The absolute tolerance on "R" is not critical,

only the relative tolerance.


2 April 1987
Atari Games Corp.
675 Sycamore Drive
P.O. Box 361110
Milpitas, CA	95035-1110


Richard Ponce de Leon
Brooks Technical Group
883 Stierlin Road
Mountain View, CA  94043


Dear Richard,

	As Evelyn suggested I am faxing the drawing for the R2R Resistor
Network for which I would like a quote.

	I would like the quote for quantities of 1K, 5K, 10K, and 25K.
I expect the game that I am considering this part for will be produced
in the 3rd Quarter this year.

	I would also like cost and delivery information for 100 prototype
units.

						Sincerely yours,
					


						Jed Margolin
						Senior Staff EE
						Atari Games Corporation


4/22/87	  From Richard Ponce de Leon

	NRE for Soft Tooling and 10 prototypes	-  $250. [8-10 weeks]

	NRE for Soft Tooling and 50 prototypes	-  $300. [8-10 weeks]

	NRE for Hard Tooling - $250.	[18 weeks]

	 25K     10K      5K      1K
	-----   -----   -----   -----
	$0.38	$0.43	$0.49	$1.14


24 April 1987
Atari Games Corp.
675 Sycamore Drive
P.O. Box 361110
Milpitas, CA	95035-1110


Jim Calhoun
Moulthrop Sales


Dear Mr. Calhoun,

	As Judy suggested I am faxing the drawing for the R2R Resistor
Network for which I would like a quote. 

	I would like the quote for quantities of 1K, 5K, 10K, and 25K.
I expect the game that I am considering this part for will be produced
in the 3rd Quarter this year.

	I would also like cost and delivery information for 100 prototype
units.

	I have included the quote from LTI that you got for us three years 
ago but you may select whatever company you feel is most appropriate.


						Sincerely yours,



						Jed Margolin
						Senior Staff EE
						Atari Games Corporation

						Phone: (408) 434-1730

						FAX: (408) 434-3776


5/6/87	from Moulthrop Sales, Janet

LTI Resistor Network:

	100 prototypes - $3.15 ea + $400 NRE	6-7 weeks ARO

	1K	 5K	 10K	 25K
	-----	-----	-----	-----
	$0.63	$0.46	$0.43	$0.38

	Jim Calhoun representing Panasonic tried to contact you to discuss
your requirements.  The best that they would be able to do in the area of
matching is 0.5% instead of 0.25%.  The absolute value tolerance would be 2%.

	Jim wanted to find out if you could live with 0.5% matching.

		erwin

I have quotes from Centralab and from LTI for R2R Networks which I
got as a response to my drawing which specified 0.25% matching.

For an 8 bit network, 0.25% gives an accuracy of 0.64 LSB. 
0.5% would give an accuracy of 1.28 LSB. Since this figure is
greater than one LSB, there would be no point using 8 bits.

I want to stay with 0.25% matching, especially since we have quotes from
two companies who say they can do it.

The quote from LTI came via Moulthrop Sales which also employs a
gentleman by the name of Jim Calhoun. (Could he be the very same
Jim Calhoun referred to in your message?)


	Jed

	OK on the 0.25%.

	Yes, it's the same Jim Calhoun.  I wonder why he didn't mention LTI.
	Maybe he assumed that I knew about the LTI quote.

	I'll watch for other potential sources.


			erwin

	The Atari part number is             118015-001