Author Topic: High Precision 10 V Reference - Analog Devices AD587KN + AD7535JN + 5x OP07CJ  (Read 6231 times)

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Offline DC1MCTopic starter

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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 DC1MCTopic starter

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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 DC1MCTopic starter

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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 »
30 Years making cars more difficult to repair.
 

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
30 Years making cars more difficult to repair.
 

Offline DC1MCTopic starter

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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.
30 Years making cars more difficult to repair.
 

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.

30 Years making cars more difficult to repair.
 
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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 DC1MCTopic starter

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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.
30 Years making cars more difficult to repair.
 

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
 

Online 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 »
30 Years making cars more difficult to repair.
 
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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.

30 Years making cars more difficult to repair.
 
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Offline DC1MCTopic starter

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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 DC1MCTopic starter

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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 »
30 Years making cars more difficult to repair.
 


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