Multibus-International

Model: ST-716

Manufactured by: Datel

4 or 8 D/A channels, 16-bit resolution

Compatible with both 8-and 16 bit CPU's (8- or 16-bit data transfer)

Accurate to 0.005% of Full Scale reading

Complete hardware and software compatibility with MULTIBUS and SBC-Series microcomputers

24-bit addressing

Memory-mapped, with user-selectable base address

Three user-selectable output ranges available: +5 V dc, 0 to +10 V dc, and +10 V dc

Selectable Transfer Acknowledge delay (XACK/) ensures compatibility with different memory speeds.

DATEL’S SineTrac ST-716 D/A BOARD PROVIDES END USERS AND OEM’s WITH A MEANS OF PRODUCING HIGH RESOLUTION ANALOG OUTPUTS FROM THEIR MULTIBUS AND ISBC MICROCOMPUTERS, WITH 16 BITS OF RESOLUTION, THIS BOARD IS AN IDEAL CHOICE FOR PRECISION SERVO CONTROL AND SIMILAR APPLICATIONS

The ST-716 provides 4 or 8 channels of digital-to-analog (D/A) conversion with 16 bits of resolution. Overall accuracy is within .005% of full scale reading.  Voltage range outputs are jumper-selectable to ensure the board’s compatibility with popular process control and test instrumentation.

Like other SineTrac products, the ST-716 is fully hardware and software compatible with its host SBC or MULTIBUS computer.  All necessary address decoders, logic controls, and data receivers are built in.  The user simply slides the ST-716 into an Intel-compatible card cage and wires the analog outputs.  The ST-716 is then ready as a memory-mapped D/A peripheral.  It is addressed by the host computer as 16 consecutive memory locations with a user-defined base address. This memory-mapped format permits virtually unlimited D/A channel expansion by using multiple ST-716’s, each with a different base address.

The ST-716 is pin-compatible with DATEL’s ST-724, ST-728, SBC-724, and SBC-728 analog output boards.  The 4-channel ST-716’s are software-compatible with the ST-724’s and ST728’s while the 8-channel ST-716’s are software-compatible with the ST-728’s.

Data inputs to the ST-716 are from the host computer’s bus.  Input coding is offset binary.

Each channel uses a DATEL Model DAC-HP16B (or DAC-HP16B-1), a 16-bit hybrid device which offers linearity to +0.003% of Full Scale reading.  The output of the converter is monotonic to 14 bits between +10C and +40C.  Offset error on each channel has been adjusted to zero prior to shipping the boards.  Trim pots on the board permit recalibration of zero (or offset) and range setting.  The converter settles in 15uS to within +0.005% of FSR.  Zero tempco is +5 ppm of FSR/C, and gain tempco is within +20 ppm of FSR/C.

The board's base address is factory set at 0F710.  However, the user may relocate the board's address anywhere up to FFFF0 by rewiring a 20-pin DIP plug.  The user may also extend the addressing to a full 24 bits by soldering jumpers into holes provided on the board adding four more bits.  This would extend the addressing capability to FFFFF0 hex.

The ST-716 is fully bus, card cage, and software compatible with the MULTIBUS.  The board is 12" W x 6.75" D x .05" H (305 x 172 x 13 mm).  Multiple ST-716 boards can mount in adjacent card slots when used with a standard, .60" spacing Intel card cage.  The ST-716C and ST-716D draw all their power from the MULTIBUS +5V line.

An on-board dc-to-dc converter provides the +15V to drive the board analog output circuits.  The ST-716 weighs approximately 11.2 ounces (0.318kg).  It can operate over a temperature range of 0 to +55C with relative humidity from 10 to 90% (non-condensing), and from 0 to 15,000 feet (0 to 4600m) in altitude.

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