National Instruments NI 6115, NI 6120 Analog Input

Chapter 3 Hardware OverviewNI 6115/6120 User Manual 3-2 ni.com

Figure 3-2. NI 6120 Block Diagram

Analog Input

The following sections describe in detail each AI category.

Input Mode

The NI6115/6120 supports only differential (DIFF) input mode. For more

information about DIFF input, refer to the Connecting Analog Input

Signals section of Chapter4, Connecting Signals, which contains diagrams

showing the signal paths for DIFF input mode.

Note The inputs are differential only in the sense that the ground loops are broken.

Then egative input is not intended to carry signals of interest, rather it provides a DC

reference point for the positive input, which may be different than ground.

Timing

PFI / Trigger

I/O Connector

RTSI Bus

STC Digital I/O (8)

EEPROM

+

CH0

Amplifier

–

Calibration

Mux

AI CH0

Mux

Analog

Trigger

Circuitry

2

Trigger Level

DACs

Trigger

Calibration

DACs

DAC1

DAQ - STC

Analog Input

Timing/Control

Analog Output

Timing/Control

Digital I/O

Trigger

Counter/

Timing I/O

RTSI Bus

Interface

DMA/IRQ

Bus

Interface

DAC

FIFO

Address/Data

Control

Data (32)

Analog

Input

Control

EEPROM

Control DMA

Interface

FPGA

DAQ-STC

Bus

Interface

Analog

Output

Control

I/O

Bus

Interface

IRQDMA

Mini

MITE

Generic

Bus

Interface

PCI

Bus

Interface

CH0+

CH0–

+

CH1

Amplifier

–

AI CH1

Mux

CH1

Latch

CH1+

CH1–

+

CH2

Amplifier

–

AI CH2

Mux

CH2

Latch

CH2+

CH2–

+

CH3

Amplifier

–

AI CH3

Mux

CH3

Latch

CH3+

CH3–

AI Control

Data (16)

Data (16)

Data (16)

Data (16)

ADC

FIFO

Data (16)

DIO

FIFO

DIO

Control

AO Control

FPGA Digital I/O (8)

Digital I/O (8)

PXI/PCI Bus

DAC0

Anti-

Aliasing

Filter

CH0

16-Bit

ADC

16

Anti-

Aliasing

Filter

CH1

16-Bit

ADC

16

Anti-

Aliasing

Filter

CH2

16-Bit

ADC

16

Anti-

Aliasing

Filter

CH3

16-Bit

ADC

16

DIO

MUX

CH0

Latch

Data (32)

Contents

Main Page Important Information Warranty Copyright Trademarks Patents Compliance FCC/Canada Radio Frequency Interference Compliance Determining FCC Class FCC/DOC Warnings Class A Compliance to EU Directives Contents Chapter 4 Connecting Signals Page About This Manual Conventions National Instruments Documentation Related Documentation Introduction About the NI 6115/6120 Using PXI with CompactPCI What You Need to Get Started Software Programming Choices NI-DAQ National Instruments ADE Software Optional Equipment Custom Cabling Unpacking Safety Information Page Page Installing and Configuring the NI 6115/6120 Installing the Software Installing the Hardware Page Configuring the Device National Instruments Corporation 3-1 NI 6115/6120 User Manual Hardware Overview DAQ - STC RTSI Bus Figure 3-1. NI 6115 Block Diagram Analog Input The following sections describe in detail each AI category. Input Mode Note The inputs are differential only in the sense that the ground loops are broken. I/O Connector Input Polarity and Input Range Considerations for Selecting Input Ranges Input Coupling Analog Output Analog Trigger Figure 3-3. Analog Trigger Block Diagram for the NI 6115/6120 Figure 3-4. Below-Low-Level Analog Triggering Mode Page Antialiasing Filters Phase-Locked Loop Circuit Correlated Digital I/O Timing Signal Routing Page Programmable Function Inputs Device and RTSI Clocks RTSI Triggers Page Figure 3-13. PXI RTSI Bus Signal Connections Connecting Signals I/O Connector Figure 4-1. I/O Connector Pin Assignment for the NI 6115/6120 I/O Connector Signal Descriptions Table 4-2. Signal Descriptions for I/O Connector Pins Table 4-2. Signal Descriptions for I/O Connector Pins (Continued) Table 4-3. Analog I/O Signal Summary for the NI 6115 Table 4-2. Signal Descriptions for I/O Connector Pins (Continued) Table 4-4. Analog I/O Summary for the NI 6120 Table 4-5. Digital I/O Signal Summary Types of Signal Sources Floating Signal Sources Table 4-5. Digital I/O Signal Summary (Continued) Ground-Referenced Signal Sources Connecting Analog Input Signals Connections for Ground-Referenced Signal Sources * Figure 4-2. Pseudodifferential Input Connections on the NI 6115 forGro und-Referenced Signals Figure 4-3. Pseudodifferential Input Connections on the NI 6120 forGro und-Referenced Signals Connections for Nonreferenced or Floating Signal Sources * Figure 4-4. Differential Input Connections on the NI 6115 for Nonreferenced Signals Common-Mode Signal Rejection Considerations Working Voltage Range Connecting Analog Output Signals Connecting Digital I/O Signals Correlating DIO Signal Connections Page Power Connections Connecting Timing Signals Page Programmable Function Input Connections DAQ Timing Connections TRIG1 Signal TRIG2 Signal Page STARTSCAN Signal Page CONVERT* Signal AIGATE Signal SISOURCE Signal SCANCLK Signal EXTSTROBE* Signal Waveform Generation Timing Connections WFTRIG Signal UPDATE* Signal UISOURCE Signal General-Purpose Timing Signal Connections GPCTR0_SOURCE Signal GPCTR0_GATE Signal GPCTR0_OUT Signal GPCTR0_UP_DOWN Signal GPCTR1_SOURCE Signal GPCTR1_GATE Signal GPCTR1_OUT Signal Figure4-34 shows the timing requirements for GPCTR1_OUT. Figure 4-35. GPCTR1_OUT Signal Timing Figure 4-36. GPCTR Timing Summary GPCTR1_UP_DOWN Signal FREQ_OUT Signal Field Wiring Considerations Calibration Loading Stored Calibration Constants Self-Calibration External Calibration Page A Specifications Analog Input Input Characteristics DC Transfer Characteristics Table A-1. NI 6115 Analog Input DC Accuracy Information Table A-2. NI 6120 Analog Input DC Accuracy Information Dynamic Characteristics Table A-4. NI6120 Analog Input Dynamic Charac teristics Figure A-1. NI 6115 Total Harmonic Distortion Plus Noise (THD+N) Figure A-2. NI 6120 Total Harmonic Distortion Plus Noise (THD+N) Figure A-3. NI6115 High-Voltage THD + N Figure A-4. NI 6120 High-Voltage THD+ N Figure A-5. NI 6115 THD + N with Filters Stability Analog Output Output Characteristics DC Transfer Characteristics Voltage Output Dynamic Characteristics Stability Digital I/O Timing I/O Triggers Analog Trigger Page Safety Maximum Working Voltage Electromagnetic Compatibility B Common Questions General Information Installing and Configuring the Device Analog Input and Output Page Timing and Digital I/O Page C Technical Support and Professional Services Glossary Numbers/Symbols A B C D E F G H I K L M N O P R S T U V W Index Numerics A B C D E F G H I K L M N O P Q R S Page T U V W