Graphics Tablet User Manual

Hardware Overview

This chapter includes an overview of the NI 5911, explains the operation of

each functional unit making up your NI 5911, and describes the signal

connections. Figure 2-1 shows a block diagram of the NI 5911.

Figure 2-1. NI 5911 Block Diagram

Differential Programmable Gain Input Amplifier (PGIA)

The analog input of the NI 5911 is equipped with a differential

programmable gain input amplifier. The PGIA accurately interfaces to and

scales the signal presented to the analog-to-digital converter (ADC)

regardless of source impedance, source amplitude, DC biasing, or

common-mode noise voltages.

Protect/

Calibration

Mux

Calibration

Generator

PGIA

Noise

Shaper

Reference

Clock

Data

A/D Converter

100 MHz, 8-Bit

Digital Signal

Processor

Digital IO

Connector

Analog Input

Connector

AC/DC Coupling

Capture

Memory

Timing IO/

Memory Control