National Instruments PCI-1200 Analog Input

Chapter 4 Theory of Operation

© National Instruments Corporation 4-5 PCI-1200 User Manual

timing, or you can use the three external timing signals, EXTCONV*,

EXTTRIG, and EXTUPDATE*, for DAQ and DAC timing.

The second group of counter/timers is called groupB and includes B0, B1,

andB2. You can use counters B0 and B1 for internal DAQ and DAC

timing, or you can use the external timing signal CLKB1 for analog input

timing. If you are not using countersB0 and B1 for internal timing, you can

use these counters as general purpose counter/timers. CounterB2 is

reserved for external use as a general purpose counter/timer.

For a more detailed description of counter group A and

countersB0 and B1, refer to the Analog Input and Analog Output sections.

Analog Input

The PCI-1200 has eight channels of analog input with

software-programmable gain and 12-bit A/D conversion. The PCI-1200

also contains DAQ timing circuitry for automatic timing of multiple A/D

conversions and includes advanced options such as external triggering,

gating, and clocking. Figure 4-4 sho ws a block diagram of the analog inpu t

circuitry.

Figure 4-4. Analog Input Circuitry

Sample-

and-Hold

Amp

DAQ

Timing

Gain Select/

Mux Counter

+

Program-

mable

Gain Amp

–

ADC

A/D

FIFO

External Trigger

Counter/Timer

Signals

WRT/RD

CONV

AVAIL

A/D

RD

EXTCONV*

OUTB1

EXTTRIG

ACH0

ACH1

ACH2

ACH3

ACH4

ACH5

ACH6

ACH7

12

12

8

6

A/D

Data

Data

Data

GAIN0

GAIN1

GAIN2

Convert

Mux

ACH1

ACH3

ACH5

ACH7

AISENSE/

AIGND

External Convert

External Scan Interval

Dither

Circuitry Dither Enable

Dither

PCI Bus

Digital

Control

Logic

MITE

PCI

Interface

Chip

Data/Address

Interface Control

Error Reporting

Arbitration

System

Interrupt

1

2

2

2

6

37

Address

Data

Control

Interrupt

1

DRQ

1

4

8

5

I/O Connector

Mux

Contents

Main Page Important Information Warranty Copyright Trademarks WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS Contents Chapter 4 Theory of Operation Page Tables About This Manual Organization of This Manual Conventions Used in This Manual National Instruments Documentation Related Documentation Customer Communication Introduction About the PCI-1200 What You Need to Get Started Unpacking Software Programming Choices National Instruments Application Software NI-DAQ Driver Software Register-Level Programming Optional Equipment Custom Cabling Page Installation and Configuration Software Installation Hardware Installation Board Configuration Analog I/O Configuration Analog Output Polarity Analog Input Polarity Analog Input Mode RSE Input (Eight Channels, Reset Condition) NRSE Input (Eight Channels) DIFF Input (Four Channels) Signal Connections I/O Connector Figure 3-1. PCI-1200 I/O Connector Pin Assignments Signal Connection Descriptions Page Page Analog Input Signal Connections Page Types of Signal Sources Floating Signal Sources Ground-Referenced Signal Sources Input Configurations Chapter 3 Signal Connections Table 3-4. Summary of Analog Input Connections Differential Connection Considerations (DIFF Configuration) Differential Connections for Grounded Signal Sources Figure 3-3. Differential Input Connections for G rounded Signal Sources Differential Connections for Floating Signal Sources Figure 3-4. Differential Input Connections for Floating Sources Single-Ended Connection Considerations Single-Ended Connections for Floating Signal Sources (RSE Configuration) Single-Ended Connections for Grounded Signal Sources (NRSE Configuration) Common-Mode Signal Rejection Considerations Analog Output Signal Connections Digital I/O Signal Connections Logical Inputs and Outputs Port C Pin Connections Power Connections DAQ and General Purpose Timing Signal Connections DAQ Timing Connections Page Page Page General Purpose Timing Signal Connections Page Page Chapter 3 Signal Connections PCI-1200 User Manual 3-26 National Instruments Corporation Figure 3-16. General Purpose Timing Signals The GATE and OUT signals in Figure3-16 are referenced to the rising edge of the CLK signal. Timing Specifications Mode 1 Input Timing Mode 1 Output Timing Mode 2 Bidirectional Timing National Instruments Corporation 4-1 PCI-1200 User Manual Theory of Operation This chapter explains the operation of each functional unit of the PCI-1200. Functional Overview The block diagram in Figure4-1 shows a functional overview of the PCI-1200 board. Figure 4-1. PCI-1200 Block Diagram PCI Interface Circuitry Timing Chapter 4 Theory of Operation PCI-1200 User Manual 4-4 National Instruments Corporation Figure 4-3. Timing Circuitry Chapter 4 Theory of Operation National Instruments Corporation 4-5 PCI-1200 User Manual Analog Input Figure 4-4. Analog Input Circuitry Analog Input Circuitry DAQ Operations Controlled Acquisition Mode Freerun Acquisition Mode Interval Scanning Acquisition Mode Single-Channel Data Acquisition Multichannel Scanned Data Acquisition DAQ Rates Analog Output Analog Output Circuitry DAC Timing Digital I/O Page Calibration Calibration at Higher Gains Calibration Equipment Requirements Using the Calibration Function A Specifications Analog Input Input Characteristics Transfer Characteristics Amplifier Characteristics Dynamic Characteristics Stability Explanation of Analog Input Specifications Explanation of Dither Explanation of DAQ Rates Analog Output Output Characteristics Transfer Characteristics Voltage Output Dynamic Characteristics Stability Explanation of Analog Output Specifications Digital I/O Timing I/O Page B Customer Communication Electronic Services Bulletin Board Support FTP Support Fax-on-Demand Support Telephone and Fax Support Country Telephone Fax Technical Support Form Page PCI-1200 Hardware and Software Configuration Form National Instruments Products Other Products Page Documentation Comment Form Title: Edition Date: Part Number: Mail to: Technical Publications Fax to: Technical Publications Glossary Numbers/Symbols A C D E Page L M N O P R S T V W Index A B C D E F G I L M N O R S T U V W