Author Topic: High Precision 10 V Reference - Analog Devices AD587KN + AD7535JN + 5x OP07CJ  (Read 2555 times)

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Offline DC1MC

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This topic pertains to the $subject, low cost (10EUR) cards that were avalable from the ebay seller  smokeli.

https://www.ebay.de/itm/High-Precision-10-V-Reference-Analog-Devices-AD587JN-AD7535JN-5x-OP177/154410695222

[url=https://www.ebay.de/itm/High-Precision-10-V-Reference-Analog-Devices-AD587JN-AD7535JN-5x-OP07CJ/154410692288]https://www.ebay.de/itm/High-Precision-10-V-Reference-Analog-Devices-AD587JN-AD7535JN-5x-OP07CJ/154410692288[/url]

He also has on his alternate account, the matching connectors:
https://www.ebay.de/itm/96pol-Federleiste-Buchsenleiste-90-gewinkelt-3-reihig-female-ERNI-004516/124355155637

There are a number of variants, some of them had AD587KN, others AD587JN, personally have 2 with AD587KN.

The most important components are socketed and can be harvested "as-is", but the idea is to reverse the board and see if we can use it in the current configuration.

So enjoy the top/bottom pictures and the first blood power of a board.

Cheers,
DC1MC
« Last Edit: April 18, 2021, 12:25:36 pm by DC1MC »
 
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Offline DC1MC

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Intial examination:
The logic on the board is fully combinational, no pesky clocks or other noise inducing signals.

The value of the 16bit BCD inputs are latched via IC2 and IC3 (74HC573A Octal TransparentD-TypeLatchesWith 3-State Outputs) and displayed on the front 4 digit 7-segment display, via the decoder ICs 7-9 (HEF4511BT BCD to 7-segment latch decoder drivers).

Also the input values are entered in a BCD to binary converter EPROM IC14 (M27C1024 64KBx16 UV EPROM), the outputs go into IC15 (AD7535JN 14bit DAC with parallel inputs ) that uses as reference IC16 (AD587KJ or JN 10volts precision reference).

On the board are a large number of precision OP, either OP07 or OP177, some relays and a mystery EPROM, IC1 (M27C128 16KBx8).

On the front panel there are two 2 positions, non-retaining switch ( Ein - 0 - Ext ein) and (Aus - 0 - Setz), most likely switching the reference with some external one.

Recommended BCD switches:
https://www.ebay.de/itm/Kodierschalter-0-9-BCD-Codierschalter-Vorwahlschalter-Pushweelswitch-1-Stuck/312231336643

So much for now, lots of things TODO.

 

Offline DC1MC

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Power (before pinout):

+5V - Over C2 (Tested OK)
-15V - Over C4 (Not-tested!!!, polarity OK, actual value TBD).
+15V - Over C6 (Not-tested !!!, polarity OK, actual value TBD).

Fun (?!?) fact: in my board the line on the capacitor body signifies (-) but fortunately the correct polarity is printed on the PCB silk mask.
 

Offline Bad_Driver

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The same BCD switches from Aliexpress, just ordered!
Still awaiting the boards ....  :box:
 

Offline McBryce

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Hi,
     I have two of the boards and I've dumped the EPROMs. The BCDBIN (27C1024) has identical contents on both boards (as expected) and contain a lookup table. The mystery EPROM (27C128) is different on both boards. They are essentially blank (filled with &00 not &FF) except for a few bytes which are possibly some sort of addressing for the card? Binary files below.

McBryce.

« Last Edit: April 21, 2021, 07:22:45 am by McBryce »
 

Offline Bad_Driver

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Interesting! Only 2 Bits difference. Let's see what the other board owners report.

btw: what are you using for the EPROM read-out? I do not have anything for this but it's never to late.
 

Offline McBryce

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My recommendation depends on how often you would use it. I have a Batronix BX48. It's bullet-proof and can program almost anything you throw at it, but it's relatively expensive. However, I use it almost daily as my main interest is vintage computer repair / restoration. For casual use there are much cheaper solutions, such as the TL-866 which I would also highly recommend.

McBryce.

https://www.batronix.com/versand/programmiergeraete/BX48/batego-II.html

https://www.ebay.de/itm/TL866A-Great-Speed-in-circuit-Programmer-USB-EPROM-EEPROM-FLASH-BIOS-AVR-AL-PIC/402699959557
 

Offline DC1MC

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Thanks everybody for your contribution, now the bit two tasks are waiting ;)

 - Connector pinout !!!

 - Analog part schematic, what are all the OP doing ?

If something's left in WE, I'll try the pinout, at least to start it.

 Cheers,
 DC1MC
 

Offline Bad_Driver

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It's 40 years ago when I built my last EPROM programmer for a Z80 based OEM system (U880 in East Germany) and wrote the assembler code.

I think the 2nd one is enough for my needs. Thanks for the link! I ordered one but it takes time on the slow boat from china  :=\

First idea was that the code line is a serial number of the board but than I saw that the datas are at different addresses in both EPROMs.
Hope my boards arrive today but DHL is like the weather, the forecast is never correct.
« Last Edit: April 16, 2021, 08:03:12 am by Bad_Driver »
 

Offline McBryce

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Thanks everybody for your contribution, now the bit two tasks are waiting ;)

 - Connector pinout !!!

 - Analog part schematic, what are all the OP doing ?

If something's left in WE, I'll try the pinout, at least to start it.

 Cheers,
 DC1MC

I have already started on some of the pinout, but I still need to find out how the connector pins are normally numbered. There's no pin numbers on the physical connectors I have.

McBryce.
 

Offline Bad_Driver

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Offline McBryce

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I found the shorter version just for that connector. I'll use the numbering they supply here (1 to 32 with rows ABC).

McBryce.

 
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Offline Bad_Driver

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DHL is better than expected. My boards arrived.
Attached first shots for your entertainment.
Seems to be a multilayer PCB with ground and power supply in the middle?
 

Offline DC1MC

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DHL is better than expected. My boards arrived.
Attached first shots for your entertainment.
Seems to be a multilayer PCB with ground and power supply in the middle?

Welcome to the (very exclusive) club   :-+ !!!
Let's make the roll call, who has the boards and read the topic still ?

Cheers,
DC1MC
 
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Offline McBryce

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DHL is better than expected. My boards arrived.
Attached first shots for your entertainment.
Seems to be a multilayer PCB with ground and power supply in the middle?

Welcome to the (very exclusive) club   :-+ !!!
Let's make the roll call, who has the boards and read the topic still ?

Cheers,
DC1MC

Me, but I didn't have enough time to look at the boards any further yet.

McBryce.
 

Offline Bad_Driver

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Sorry it takes some time to start. Real life implications during f@%&ing shutdown with 3 kids at home
and full time job give me only short interrupts for my bench.  :--
(nach dreizehn Monaten zweifelt man immer mehr an der Fähigkeit unserer geilen Regierung)

Has someone ask the seller where the boards come from?

 

Offline artag

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Unfortunately, he doesn't ship to UK
 

Offline FransW

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Waiting for my boards & connectors.
PE1CCN, Systems Engineering, HP, Philips, TEK, BRYMAN, Fluke, Keithley
 

Offline tggzzz

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Unfortunately, he doesn't ship to UK

Fortunately, in my case - since I have some standards and don't need another :)
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
Having fun doing more, with less
 

Offline McBryce

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For those who are as anal OCD as I am, I made this sheet to help on pinout reverse engineering. The connector picture is of the mating connector, not the connector on the populated PCB.

McBryce.

« Last Edit: April 18, 2021, 11:04:57 am by McBryce »
 
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Offline Bad_Driver

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It seems that all boards are sold. That‘s good because I couldn't suppress my wish to buy more boards.
 

Offline McBryce

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Not going to have much more time today, so here is my Pinout info for today.

McBryce.

 
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Offline DC1MC

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Not going to have much more time today, so here is my Pinout info for today.

McBryce.

Lets add something extra, maybe next time we can have some common editable format, let's kill all the low hanging fruits:
      A        B        C
01 xxxxxxx  xxxxxxx  xxxxxxx
02 xxxxxxx  xxxxxxx  xxxxxxx
03 xxxxxxx  xxxxxxx  xxxxxxx
04 xxxxxxx  xxxxxxx  xxxxxxx
05 xxxxxxx  xxxxxxx  xxxxxxx
06 xxxxxxx  xxxxxxx  xxxxxxx
07 xxxxxxx  xxxxxxx  xxxxxxx
08 xxxxxxx  xxxxxxx  xxxxxxx
09 xxxxxxx  xxxxxxx  xxxxxxx
10 xxxxxxx  xxxxxxx  xxxxxxx
11  -15V     -15V     -15V
12  -15VX    -15Vx    -15Vx  (IC20 - OP07)
13  +15V     +15V     +15V
14  +15VX    +15Vx    +15Vx  (IC20 - OP07)
15   GND      GND      GND 
16   GND      GND      GND 
17   +5V      +5V      +5V 
18   +5V      +5V      +5V 
19 xxxxxxx  xxxxxxx  xxxxxxx
20 xxxxxxx  xxxxxxx  xxxxxxx
21 xxxxxxx  xxxxxxx  xxxxxxx
22 xxxxxxx  xxxxxxx  xxxxxxx
23 xxxxxxx  xxxxxxx  xxxxxxx
24 xxxxxxx  xxxxxxx  xxxxxxx
25 xxxxxxx  xxxxxxx  xxxxxxx
26 xxxxxxx  xxxxxxx  xxxxxxx
27 xxxxxxx  xxxxxxx  xxxxxxx
28 xxxxxxx  xxxxxxx  xxxxxxx
29 xxxxxxx  xxxxxxx  xxxxxxx
20 xxxxxxx  xxxxxxx  xxxxxxx
31 xxxxxxx  xxxxxxx  xxxxxxx
32 xxxxxxx  xxxxxxx  xxxxxxx
 

Offline DC1MC

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It seems that all boards are sold. That‘s good because I couldn't suppress my wish to buy more boards.

There are just a few connectors left, if you need them now is the time to get them.
 

Offline McBryce

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Ok, here's the editable version with all I have so far (plus your notes too).

I wouldn't be too worried about the availability of the connector, they are relatively easy to find:
ERNI - https://www.ebay.de/itm/96pol-Federleiste-Buchsenleiste-90-gewinkelt-3-reihig-female-ERNI-004516-/124355155637

Amphenol - https://www.ebay.de/itm/4x-Amphenol-Federleiste-Buchse-96-polig-90-C143-012B-96S-NOS/324247782999

McBryce.

« Last Edit: April 18, 2021, 01:03:10 pm by McBryce »
 

Offline DC1MC

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Here's my update version and some notes at the end:
      A        B        C
01  A2K_00   A2K_01   A2K_02
02  A2K_03   A2K_04   A2K_05
03  A2K_06   A2K_07   A2K_08
04  A2K_09   A2K_10   BCD_00
05  BCD_01   BCD_02   BCD_03
06  BCD_10   BCD_11   BCD_12
07  BCD_13   BCD_20   BCD_21
08  BCD_22   BCD_23   BCD_30
09  BCD_31   BCD_32   BCD_33
10  A2K_11  xxxxxxx  xxxxxxx
11  -15V     -15V     -15V
12  -15VX    -15Vx    -15Vx  (IC20 - OP07)
13  +15V     +15V     +15V
14  +15VX    +15Vx    +15Vx  (IC20 - OP07)
15   GND      GND      GND 
16   GND      GND      GND 
17   +5V      +5V      +5V 
18   +5V      +5V      +5V 
19 xxxxxxx  xxxxxxx  xxxxxxx
20 xxxxxxx  xxxxxxx  xxxxxxx
21 xxxxxxx  xxxxxxx  xxxxxxx
22 xxxxxxx  xxxxxxx  xxxxxxx
23 xxxxxxx  xxxxxxx  xxxxxxx
24 xxxxxxx  xxxxxxx  xxxxxxx
25 xxxxxxx  xxxxxxx  xxxxxxx
26 xxxxxxx  xxxxxxx  xxxxxxx
27 xxxxxxx  xxxxxxx  xxxxxxx
28 xxxxxxx  xxxxxxx  xxxxxxx
29 xxxxxxx  xxxxxxx  xxxxxxx
20 xxxxxxx  xxxxxxx  xxxxxxx
31 xxxxxxx  xxxxxxx  xxxxxxx
32 GND_12V  GND_12V  GND_12V


NOTES:
- The LE signal of the BCD inputs is not on the connector, is a NOR output (IC4 74HC32), it could be that the data outputs of the 2K EPROM are used to do some switching.
- Interesting to see how the relays are controled, therr is this beefy ULN Darlington array.
- Is U20 the final amplifier for the output or is special put for the DAC reference voltage ?

 Cheers,
 DC1MC
 

Offline FransW

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While rearranging my stuff, I found a bunch of the Erni connecters.
Male & female, straight & 90 degr bended, used.
If anyone is interested, please contact me by PM.
Regards,
Frans
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Offline Bad_Driver

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I will start these days with the analog part behind the DAC (analog side).
For our convenience I try to model it in Multisim. Seems to be standard design following data sheets.

I will use my board with the DIP OPs since they are easier to lift for testing because I want to avoid any kind of damage to the OPs.
But plz don't expect a finalized schematics this week. It will take time due to real life impact.
 
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Offline DC1MC

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I will start these days with the analog part behind the DAC (analog side).
For our convenience I try to model it in Multisim. Seems to be standard design following data sheets.

I will use my board with the DIP OPs since they are easier to lift for testing because I want to avoid any kind of damage to the OPs.
But plz don't expect a finalized schematics this week. It will take time due to real life impact.

There is absolutely no hurry, I'll try the rest of the digital and connector part and maybe power it on in the WE.

 Cheers,
 DC1MC
 

Offline Qw3rtzuiop

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Thanks for the hints and the research.

Here are some of my almost empty eproms.
 
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Offline DC1MC

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Thanks for the hints and the research.

Here are some of my almost empty eproms.

Thanks for your contribution, if the 2KB memory is used as a PAL to do some selections, the comparisons of them will be telling us about what they're doing. Soon I'll statz deeply in the digital part, there is some combinatorics logic that I want to decode, because the signal to strobe the BCD inputs in the latches is generated there.

 Cheers,
 DC1MC
 

Offline Bad_Driver

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Do we all have the same board revisions? My both are K3/EEB1081/2.

I'm awaiting my EEPROM reader but this will take some weeks.

For easier contribution to the connector layout the table of DC1MC as EXCEL.
« Last Edit: April 21, 2021, 08:17:56 am by Bad_Driver »
 

Offline McBryce

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Do we all have the same board revisions? My both are K3/EEB1081/2.

I'm awaiting my EEPROM reader but this will take some weeks.

That's the number on both of mine.

McBryce.
 

Offline DC1MC

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Do we all have the same board revisions? My both are K3/EEB1081/2.

I'm awaiting my EEPROM reader but this will take some weeks.

For easier contribution to the connector layout the table of DC1MC as EXCEL.

Mine are the same revision as well  :-+ !!!
 

Offline FransW

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And so ar mine.
Frans
PE1CCN, Systems Engineering, HP, Philips, TEK, BRYMAN, Fluke, Keithley
 

Offline DC1MC

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Guess what just arrived in  ^-^
 

Offline DC1MC

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To complement the BCD switches, I've got this:

https://www.ebay.de/itm/164595954992

and this:

https://www.ebay.de/itm/164175322203

I already have the green perfboard where I'll solder the connector and some machined pin bars to make a little socket for the switches.

This WE I was conscripted by the SWMBO for garden work :(, but I intend to finish the digital part next week, any news on the analog part ?

 Cheers,
 DC1MC
 

Offline Bad_Driver

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My EPROM reader arrived earlier than expected. Attached the both files, no suprises.
A lonely "20H" and one line of code.

Unfortunately my family wants the reactivation of my 3D printer but after standing in the corner for 2 years it needs a lot of efforts.... :phew:
I'm in the "change every single part" mode ....  |O Maybe I should check the PSU now since all dry runs work but not real printing.

So the ref boards have to wait on my bench a little bit longer.

 

Offline FransW

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[attachimg=2]Annotated ref board.
Vectored image.
updated
« Last Edit: April 29, 2021, 03:15:36 pm by FransW »
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Offline FransW

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Any working example or prototype?
Unipolar or bi-polar?
BCD switches seem logical as does the ERNI connector replacement, however
the latter not strictly necessary.

All V-supply pin rows are inter-connected which leaves only one in actual use.
Is your plan to connect the memory directly to the BCD switches or via the ERNI
connector?
Or the use of a breakout assembly?

Frans
« Last Edit: May 04, 2021, 12:10:38 pm by FransW »
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Offline DC1MC

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Some unexpected health problems popped up, so for the moment here is a picture with the (unfinished) BCD connectors, one of the resistor networks that I've mentioned in a previous post and a Kikad project where I've traced the minimum to load the latches with the BCD values (the signal is LE).

 Cheers,
 DC1MC
 

Offline FransW

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Updated Board picture.
Frans

Edit: added picture
Note: female breadboard wires are a perfect fit on the 90 degr add-on connector.
They fit nicely next to each other, rows & columns.
« Last Edit: May 07, 2021, 11:45:54 am by FransW »
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Offline FransW

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Abandoned by TS?

Misjudged purpose & means?
« Last Edit: June 05, 2021, 09:25:49 am by FransW »
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