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PCI-20021M-1B I/O Module Overview

12-Bit 8 Channel Analog Output Expansion I/O Module

The PCI-20021M-1B adds eight 12-bit voltage outputs to any expandable Intelligent Instrumentation board. You can select either a ±5V or a ±10V full-scale range.

A dynamic output refresh technique allows a single digital-to-analog converter (DAC) to service all 8 outputs. The DAC output is multiplexed to 8 sample/hold (S/H) circuits. Onboard RAM stores the digital data. A sequencer continuously cycles RAM data to the input of the DAC and multiplexes the DAC output to the appropriate S/H. The computer updates the RAM through memory write operations or DMA transfers. Memory read operations allow the computer to examine output values.

Features & Benefits

• 8 Analog Output Channels

• 12-Bit Resolution

• 1/2LSB Linearity

• 500µs Settling Time

Hardware Specifications

Parameter	Conditions	Specifications

Analog Outputs
Number of Channels		8
Resolution		12 bits (1 part in 4,096)
Voltage Ranges		±5V, ±10V
Accuracy
Gain		±1/2LSB
Linearity Error	Voltage output, maximum ±1/2LSB
Offset Voltage	0 to +50° C	±2mV
	Noise DC to 10kHz, maximum ±1LSB
	Monotonicity 0 to +70° C 12 bits
Output Stage
Output Current		±1mA
System Throughput*
Analog Output		2,000 outputs/second
Physical Characteristics
Power Requirements**
	+5V	569mA maximum
	+15V	43mA maximum
	-15V	50mA maximum
Operating Temperature Range		0 to 70° C
* Hardware limit only. Software may reduce speed.
** Refer to the data sheet of the host board to determine available power.