12/16/18-Bit High-Accuracy Analog Input Module

• 16SE/8Diff Channels

The PCI-20364M-1 option module adds 16 single-ended or 8 differential high-accuracy analog inputs to any expandable Intelligent Instrumentation board. The module's integrating A/D converter provides up to 18 bits of measurement resolution. The integrating design provides stable, low-noise performance and maximizes rejection of normal-mode 50/60Hz interference. As a result, the PCI-20364M-1 is ideal for thermocouple, RTD, and strain gage applications. Absolute accuracy, including contributions from all error sources, is less than 0.02% error in the 16-bit mode.

Board Architecture - An embedded controller coordinates all on-board functions (including self-test, auto-zero, and auto-calibration), which makes the PCI-20364M-1 easy to use. You can configure the 16 channels as either single-ended or differential (up to 8) inputs. If you need more channels, you can also use the PCI-20031M-1 Expander/Sequencer module to increase the number of channels in 32SE/16Diff-channel increments.

A programmable gain amplifier provides high input impedance and differential connections with high common-mode rejection. Gains of 1, 10, 100, and 200 are supported, which results in full-scale ranges of 25mV to 10V. The PCI-20364M-1 is completely software-programmable. You can program the module to read channels in any order, and you can select the single-ended/differential mode, gain, and A/D range separately for each channel.

Auto-calibration is performed at power-up and may be repeated upon command. A precision reference is provided for each range. You can also calibrate the module against an external reference to achieve the highest possible accuracy. (Calculations are automatically performed to correct for residual internal offset and gain errors.) Timing and synchronization of measurements can be controlled by software, by a rate generator on another data acquisition device, or by an external signal.

• 12, 16, & 18-Bit Operation

• 8 Differential or 16 Single-Ended Inputs

• Channel Count Easily Expanded

• Low-Noise Integrating Design

• Programmable Gain Amplifier

• Internal and External Auto-Zero and Auto-Calibration

• Totally Software Programmable, No Mechanical Settings

Parameter	Conditions	Specifications
Analog Inputs
Number of Channels	Single-ended	16
	Differential	8
Resolution		12/16/18 bits (1 part in4,096/65,536/262,144)
Voltage Ranges*	Normal Mode
	Gain = 1	±5V, 0 to 10V
	Gain = 10	±0.5V, 0 to 1.0V
	Gain = 100	±0.05V, 0 to 0.1V
	Gain = 200	±0.025V, 0 to 0.05V
	Extended Mode
	Gain = 1	±7V, -2 to 12V
	Gain = 10	±0.7V, -0.2 to 1.2V
	Gain = 100	±0.07V, -0.02 to 0.12V
	Gain = 200	±0.035V, -0.01 to 0.06V
Overvoltage Protection	Power on	±35V
	Power off	±20V
Gain Accuracy	Gain = 1	±0.01%
	Gain = 10	±0.01%
	Gain = 100	±0.02%
	Gain = 200	±0.02%
Offset Voltage	RTO	±1.22mV
Bias Current		1.0nA
Input Impedance	Single-ended	1011 ohms/50pF
Common Mode
Range (Vrange)	Vcm = Vrange - (Vdiff * Gain)/2	±10V, (dc + peak ac)
Rejection Error	50/60Hz, 100 ohm imbalance
	Gain = 1	96dB (0.1LSB/V)
	Gain = 10	116dB (0.1LSB/V)
	Gain = 100	118dB (0.83LSB/V)
	Gain = 200	-118dB (1.65LSB/V)
Noise	Counts peak/LSBs RMS
	12-bit mode
	All gains	±0.5 Counts/0LSB
	16-bit mode
	Gain = 1, 10	±1.5 Counts/0.5LSB
	Gain = 100, 200	±2 Counts/0.7LSB
	18-bit mode
	Gain = 1, 10	±3.5 Counts/1LSB
	Gain = 100	±4 Counts/1.4LSB
	Gain = 200	±7 Counts/2.3LSB
Monotonicity	No missing code	16 bits
Linearity Error		±0.003%
System Throughput**
Multichannel Analog Input	Standard Mode
	12-bit resolution	500Hz
	16-bit resolution	50Hz
	18-bit resolution	12.5Hz
	50Hz rejection mode
	16-bit resolution	45Hz
	18-bit resolution	9.8Hz
	60Hz rejection mode
	16-bit resolution	28Hz
	18-bit resolution	12Hz
Physical Characteristics
Power Requirements***	+5V	400mA maximum
	+15V	4mA maximum
	-15V	25mA maximum
Operating Temperature Range****		0 to 70° C
* The typical specifications shown apply when internal auto-calibration is used. Improvements are possible when external auto-calibration is used.
** Hardware limit only. Software may reduce speed.
*** Refer to the data sheet of the host board to determine available power.
**** In most cases, the extended ranges offer excellent performance at or near the specifications shown for the linear ranges. However, only the linear ranges are verified during final production test.