NATIONAL SEMICONDUCTOR ADC1173 User Guide

Summary

This ultra low-power 8-bit ADC is a high-speed signal converter operating at up to 15 MSPS, designed for diverse imaging and video applications. It efficiently digitizes analog signals using single +3V power while maintaining excellent performance metrics. This comprehensive manual provides electronics designers with detailed pin descriptions, operating ratings, technical specifications, and application guidance necessary for integrating the ADC into portable equipment, set-top boxes, digital cameras, and advanced communications systems.

ADC1173
- General Description
- Features
- Key Specifications
- Applications
- Pin Configuration
- Ordering Information
- Block Diagram
- Pin Descriptions and Equivalent Circuits
- Absolute Maximum Ratings
- Operating Ratings(Notes , )
- Converter Electrical Characteristics
- Typical Performance Characteristics
- Specification Definitions
- Timing Diagram
  - FIGURE 1. ADC1173 Timing Diagram
- FIGURE 2. tEN, tDISTest Circuit
- Functional Description
- Applications Information
  - 1.0 THE ANALOG INPUT
  - 2.0 REFERENCE INPUTS
  - FIGURE 3. Simple, Low Component Count, Self -Bias Reference application. Because of resistor toleran
  - FIGURE 4. Better defining the ADC Reference Voltage. Self-bias is still used, but the reference volt
  - FIGURE 5. Driving the reference to force desired values requires driving with a low impedance source
  - 3.0 POWER SUPPLY CONSIDERATIONS
  - 4.0 THE ADC1173 CLOCK
  - 5.0 LAYOUT AND GROUNDING
  - FIGURE 6. Layout example showing separate analog and digital ground planes connected below the ADC11
  - 6.0 DYNAMIC PERFORMANCE
  - FIGURE 7. Isolating the ADC clock from Digital Circuitry.
  - 7.0 COMMON APPLICATION PITFALLS
  - FIGURE 8. 5.5 MHz Low Pass Filter to Eliminate Harmonics at the Signal Input.
  - FIGURE 9. 11 MHz Low Pass filter to eliminate harmonics at the signal input. Use at input frequencie
- Physical Dimensions

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Manual Details

Brand	National
Pages	21
File Size	605.57 KB
Published	June 02, 2026

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Frequently Asked Questions

What is the maximum sampling frequency this converter supports?

The ADC1173 has a maximum sampling frequency of 15 MSPS (minimum).

How do I enable and read the digital output data?

The outputs are enabled by bringing the OE pin low, and valid data appears after the D0-D7 10 rising edge of the CLK input.

What power requirements must be met for stable operation?

It requires a clean, quiet +3V single supply voltage, with common sources like AV and DV needing separate bypass capacitors (10µF and 0.1µF ceramic chip).

NATIONAL SEMICONDUCTOR ADC1173 User Guide

Summary

FIGURE 1. ADC1173 Timing Diagram

1.0 THE ANALOG INPUT

2.0 REFERENCE INPUTS

FIGURE 3. Simple, Low Component Count, Self -Bias Reference application. Because of resistor toleran

FIGURE 4. Better defining the ADC Reference Voltage. Self-bias is still used, but the reference volt

FIGURE 5. Driving the reference to force desired values requires driving with a low impedance source

3.0 POWER SUPPLY CONSIDERATIONS

4.0 THE ADC1173 CLOCK

5.0 LAYOUT AND GROUNDING

FIGURE 6. Layout example showing separate analog and digital ground planes connected below the ADC11

6.0 DYNAMIC PERFORMANCE

FIGURE 7. Isolating the ADC clock from Digital Circuitry.

7.0 COMMON APPLICATION PITFALLS

FIGURE 8. 5.5 MHz Low Pass Filter to Eliminate Harmonics at the Signal Input.

FIGURE 9. 11 MHz Low Pass filter to eliminate harmonics at the signal input. Use at input frequencie

ADC1173

General Description

Features

Key Specifications

Applications

Pin Configuration

Ordering Information

Block Diagram

Pin Descriptions and Equivalent Circuits

Absolute Maximum Ratings

Operating Ratings(Notes , )

Converter Electrical Characteristics

Typical Performance Characteristics

Specification Definitions

Timing Diagram