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Table of Contents


The OP7817 (also named OP7817-2) provides 16 push-pull digital output signals with specific voltage conditioning. All outputs are updated individually by the OP7000 or OP7000V2 Primary FPGA with a maximum time delay of fewer than 75 nanoseconds.

All outputs support voltages up to 30V and the output current is up to 100mA in push-pull.

The board also holds a CPLD which allows controlling the line states when the Primary FPGA is inactive, such as during the power-up phase of the chassis.

Board Layout

The 16 channels are routed via the mid-plane of the chassis to the Primary FPGA card (OP7161-1 or OP7170-1) which controls the channels' state.  

OP7817 Digital Signal Conditioning Module

Output Circuit Description

The diagram below illustrates the circuit for one channel. The state of the Vout output is controlled by the FPGA, and its value depends on the V_User and V_User_RTN values.

Typical Push-Pull circuit diagram

On the actual board, the circuitry uses dual opto-coupler and operational amplifiers for consecutive channels (channels 0 and 1, 2 and 3, etc.).

Electrical Specifications

The measurements provided below are for typical Vuser values, but the board can also operate between the specified ranges.

Vuser = 5V

Conditions

MINIMUM

TYPICAL

MAXIMUM

UNITS

MODE

High Level

RL (1 kohm)

3

3.4


VDC

Pull Down

Iout source max* 80 mA

2.2

2.8


VDC


Low Level

Iout sink max* 80 mA



0.2

VDC

Pull Up


Vuser = 12V

Conditions

MINIMUM

TYPICAL

MAXIMUM

UNITS

MODE

High Level

RL (1 kohm)

10

10.4


VDC

Pull Down

Iout source max* 100 mA

8.4

9.4


VDC


Low Level

Iout sink max* 100mA



0.2

VDC

Pull Up


Vuser =24V

Conditions

MINIMUM

TYPICAL

MAXIMUM

UNITS

MODE

High Level

RL (1 kohm)

21.7

22.4


VDC

Pull Down

Iout source max* 100 mA

20.4

21.4


VDC


Low Level

Iout sink max* 100mA



0.2

VDC

Pull Up

*Due to the dual component used in the design, the maximum current value applies to two consecutive channels of the card, and this limitation must be taken into account. For example, for any two consecutive channels, the 100mA limit shared between the two channels can be distributed as follows:

  • First and second channel driving 50mA each
  • First channel at 80mA and second channel at 20mA
  • First channel at 0mA and second channel at 100mA
  • etc.

Installation

The OP7817 digital output signal conditioning module must be inserted at the back of the OP7000 simulator. The card can be installed in any of the 16 back slots, provided the front slot configuration is compatible. Refer to the page OP7000V2: Adding or Replacing Boards for more information on digital I/O card placement in the chassis - the same applies to the OP7000 chassis.

Make sure that the board is properly aligned using the guide tracks before pressing it into place.

Face Plate

The faceplate provides a DB37F connector (see “connector pins assignment” for details).

DB37F Connector Pins Assignment

DB37

Connector

Channel

DB37

Connector

Channel


1

+IN00

20

-IN00

db37 connector

2

+IN01

21

-IN01

3

+IN02

22

-IN02

4

+IN03

23

-IN03

5

+IN04

24

-IN04

6

+IN05

25

-IN05

7

+IN06

26

-IN06

8

+IN07

27

-IN07

9

+IN08

28

-IN08

10

+IN09

29

-IN09

11

+IN10

30

-IN10

12

+IN11

31

-IN11

13

+IN12

32

-IN12

14

+IN13

33

-IN13

15

+IN14

34

-IN14

16

+IN15

35

-IN15

17


36


18


37


19




Specifications

Product name

OP7817-2

Part number

126-0390

Product type

OP7000 back 16 Dout push-pull

Number of channels

16

Isolation

opto-isolator

Output Current max

±100 mA continuous (shared between 2 consecutive channels)

Output Protection

Reverse Bat/Overvoltage protection (33V)/short-circuit protection

Output Voltage range

3.3V to 30 Vdc

Vuser (external)

5 Vdc to 30 Vdc

Delay Low-to-High

65 ns (with 500Ω load)

Delay High-to-Low

65 ns (with 500Ω load)

Rise/Fall times

50 ns (with 500Ω load)

Bandwidth

500 kHz

Dimensions

18.8 x 16.4 cm (7.4 in x 6.46 in)

I/O connector

DB37F

Operating temperature

10 to 40 ºC (50 to 104ºF)

Storage temperature

-55 to 85ºC (-67 to 185ºF)

Relative humidity

10 to 90%, non-condensing

Maximum altitude

2,000 m (6562 ft.)