Acqutek - PA-DA12(16) (details)
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Similar / Related Products PI-IO48A - PA-CP12 - PA-ST12(-H) - PA-MA12(-H) - PA-MD12(16) - PA-AD12(-H) - PA-DA12(16)
XC-IO96 - XC-AD12 - XC-DA12
XI-PI08 - XI-IM04 - XO-RR08 - XO-SRD4/XO-SRA4 - ST-XD02 - ST-DM37 - IC-XCXD

PA-DA12(16) Brief Description
Digital to Analog Card

Description - Model No - Expansion - Block Diagram - Function - Register - Programming - Specifications


    10us (PA-DA12), 20us (PA-DA16) digital to analog converter (D/A).
    12-Bit D/A converter with 1 LSB accuracy. (PA-DA12)
    16-Bit D/A converter with 2 LSB accuracy. (PA-DA16)
    3 voltage output D/A channels.
    3 current output D/A channels.


    For users who require D/A only, we've got the cost saving solution. The PA-DA12 and PA-DA16 are 12 bit/ 16 bit digital to analog converter cards.

    The PA-DA12(16) provides 3 channels of 12 bit or 16 bit digital to analog conversions (D/A). The conversion time for PA-DA12 is 10us and 20us for PA-DA16.

    This card also provides a current output for each channel. Up to 25mA current output can be used to drive the user's application.


    Function PA-DA12 PA-DA16
    D/A Resolution 12 Bit 16 Bit
    Channels 3 3
    Conversion time 10us 20us
    DAC DAC7541 DAC7616
    Accuracy 11 Bit 14 Bit


    Model No. Function
    ST-DM37 Screw terminal board for A/D D/A connector
    IC-XCXD Chassis for XCI/XDI expansion cards



    Data register - The PA-DA12(16) uses 6 data registers or ports. The ports are base+4 through base+9. Using 2 ports enables the user to send a 12-bit or 16-bit word to the D/A converter using an 8-bit bus without getting glitches on the output.

    Here is an example of the data register scheme. Say a user wishes to convert the digital value from 1AFH to 1B0H to an analog value in the 12-bit D/A conversion. Using the standard approach of sending 8 bits at a time would result in a glitch on the output at these digital values 1AFH-1A0H-1B0H (sending LSB first, then MSB) or 1AFH-1BFH-1B0H (sending MSB first, then LSB).

    However, using the PA-DA12, one would write the 0H (4 least significant bits) to the temporary register (base+4 for channel 1, base+6 for channel 2 and base+8 for channel 3). Next the user wouldwrite 1BH (8 most significant bits) to the D/A O/P (base+5 for channel 1, base+7 for channel 2 and base+9 for channel 3). Upon writing the MSB to base+5, the data in the temporary register is automatically sent to the output, thus, both MSB and LSB arrive at the D/A simultaneously. (i.e. no glitch)

    D/A conversion - D/A conversion is accomplished using a 12 or 16 bit D/A conversion chip. The 12-bit or 16-bit words are sent from the data bus and a temporary register simultaneously. This enables a 12-bit or 16-bit word to be sent from an 8-bit data bus without getting odd glitches on the output. (See data register section)

    The signal connector - The connector for the D/A output signals is the 37 pin male D-type connector.


    Port Default Direction Function
    +4 02E4H I/O write D/A channel 1 LSB temp. register
    +5 02E5H I/O write D/A channel 1 MSB register
    +6 02E6H I/O write D/A channel 2 LSB temp. register
    +7 02E7H I/O write D/A channel 2 MSB register
    +8 02E8H I/O write D/A channel 3 LBS temp. register
    +9 02E9H I/O write D/A channel 3 MSB register


    Shipped with this board are Utility, Library and Sample Programs. These programs are included at no additional expense with this product.

    Utility Program - This program will provide comprehensive testing of various functions of the board to ensure proper operation.
    Library And Sample Programs - The library program provides the interface to Turbo-C, Microsoft Quick Basic, Microsoft Quick C, Microsoft GW-BASIC, IBM BASIC and Assembler.
    Window Driver - Window 3.1 and Window NT driver interface is available as an optional product.


    Digital to Analog (D/A)
    Resolution 12 bits (PA-DA12)
    16 bits (PA-DA16)
    Cannel 3
    DAC controller 7541 (PA-DA12)
    7616 (PA-DA16)
    Output voltage range -5V to +5V, -10V to +10V
    0V to +5V, 0V to +10V
    Output current range -25mA to +25 mA
    0 mA to +25mA
    Accuracy 1 bit (PA-DA12)
    2 bits (PA-DA16)
    Conversion time 10 us(PA-DA12)
    20 us(PA-DA16)
    Connector 37 pins D-type male connector
    Interface Characters
    Compatible bus IBM PC and compatibles
    Data path 8 bits
    Interface type 12 bit I/O mapped
    I/O location occupied 8
    Port address range 100H to FF0H
    Jumper configurable
    Power requirement/comsumption 1.25A/+5v
    Operating temperature +5 ° C to +50 ° C
    Storage temperature -25 ° C to +85 ° C
    Operating humidity 0 to 90% non-condensing
    Storage humidity 0 to 90% non-condensing
    Weight 180 g
    Dimension 17.5 x 12.6 x 2.0 cm

Copyright © 1996 - 2000 by Acqutek Corporation, Inc.