NATIONAL SEMICONDUCTOR ADC108S052 User's Manual

Summary

This highly reliable, low-power CMOS 10-bit Analog-to-Digital Converter features eight input channels and variable conversion rates up to 500 kSPS. Designed for demanding environments, it uses independent analog and digital supplies, ensuring optimal performance stability. This documentation provides comprehensive technical details, including electrical specifications, pinouts, and guidelines necessary for proper integration into applications such as automotive navigation systems, medical instruments, mobile communications gear, and industrial control systems.

ADC108S052
- General Description
- Features
- Key Specifications
- Applications
- Connection Diagram
- Ordering Information
- Block Diagram
- Pin Descriptions and Equivalent Circuits
- Absolute Maximum Ratings
- Operating Ratings (Notes , )
- Package Thermal Resistance
- ADC108S052 Converter Electrical Characteristics
- ADC108S052 Timing Specifications
- Timing Diagrams
  - FIGURE 1. ADC108S052 Operational Timing Diagram
  - FIGURE 2. ADC108S052 Serial Timing Diagram
  - FIGURE 3. SCLK and CS Timing Parameters
- Specification Definitions
- Typical Performance Characteristics
- 1.0 Functional Description
  - 1.1 ADC108S052 OPERATION
    
    FIGURE 4. ADC108S052 in Track Mode
    
    FIGURE 5. ADC108S052 in Hold Mode
  - 1.2 SERIAL INTERFACE
  - TABLE 1. Control Register Bits
  - TABLE 2. Control Register Bit Descriptions
  - TABLE 3. Input Channel Selection
  - 1.3 ADC108S052 TRANSFER FUNCTION
    
    FIGURE 6. Ideal Transfer Characteristic
  - 1.4 ANALOG INPUTS
    
    FIGURE 7. Equivalent Input Circuit
  - 1.5 DIGITAL INPUTS AND OUTPUTS
- 2.0 Applications Information
  - 2.1 TYPICAL APPLICATION CIRCUIT
    
    FIGURE 8. Typical Application Circuit
  - 2.2 POWER SUPPLY CONSIDERATIONS
    
    2.2.1 Power Supply Sequence
    
    2.2.2 Power Management
    
    2.2.3 Power Supply Noise Considerations
  - 2.3 LAYOUT AND GROUNDING
- Physical Dimensions

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September

108S 8-C hannel,200 k S to k S ,10-B it /D onverter

ADC108S052 8-Channel, k SPS to k SPS, 10-Bit A/D Converter General Description Features

The ADC108S052 is low-power, eight-channel CMOS 10- Eight input channels bit analog-to-digital converter specified for conversion Variable power management

throughput rates of k SPS to k SPS. The converter is Independent analog and digital supplies based on successive-approximation register architecture

SPI/QSPI/MICROWIRE/DSP compatible

with an internal track-and-hold circuit. It can be configured to

Packaged in 16-lead TSSOP

accept up to eight input signals at inputs IN0 through IN7. The output serial data is straight binary and is compatible

Key Specifications

with several standards, such as SPI™, QSPI™, MICROW-

Conversion Rate k SPS to k SPS

IRE™, and many common DSP serial interfaces.

DNL (VA VD 2.7V to 5.0V) ±0.4 LSB (max)

The ADC108S052 may be operated with independent ana-

INL (VA VD 2.7V to 5.0V) ±0.4 LSB (max)

log and digital supplies. The analog supply (VA) can range

Power Consumption

from +2.7V to +5.25V, and the digital supply (VD) can range

3V Supply 1.5 m W (typ)

from +2.7V to VA. Normal power consumption using +3V or

5V Supply 7.5 m W (typ)

+5V supply is 1.5 m W and 7.5 m W, respectively. The power- down feature reduces the power consumption to 0.09 µW using +3V supply and 0.30 µW using +5V supply. Applications The ADC108S052 is packaged in 16-lead TSSOP pack- Automotive Navigation age. Operation over the extended industrial temperature Portable Systems range of −40˚C to +105˚C is guaranteed.

Medical Instruments Mobile Communications Instrumentation and Control Systems

Connection Diagram

Ordering Information

Order Code Temperature Range Description

ADC108S052CIMT −40˚C to +105˚C 16-Lead TSSOP Package ADC108S052CIMTX −40˚C to +105˚C 16-Lead TSSOP Package, Tape Reel ADC108S052EVAL Evaluation Board

TRI-STATE® is trademark of National Semiconductor Corporation. MICROWIRE™ is trademark of National Semiconductor Corporation. QSPI™ and SPI™ are trademarks of Motorola, Inc.

National Semiconductor Corporation DS201644 www.national.com

Page Summary Contents For NATIONAL SEMICONDUCTOR ADC108S052 User's Manual

Page 1 September 108S 8-C hannel,200 k S to k S ,10-B it /D onverter ADC108S052 8-Channel, k SPS to k SPS, 10-Bit A/D Converter General Description Features The ADC108S052 is low-power, eight-channel CMOS 10...

Page 2 Block Diagram Pin Descriptions and Equivalent Circuits Pin No. Symbol Equivalent Circuit Description ANALOG I/O IN0 to IN7 Analog inputs. These signals can range from 0V to VREF. DIGITAL I/O Digital c...

Page 3 Absolute Maximum Ratings (Note 1) Operating Ratings (Notes 1, 2) 108S If Military/Aerospace specified devices are required, −40˚C TA please contact the National Semiconductor Sales Office/ Operating T...

Page 4 ADC108S052 Converter Electrical Characteristics (Note 8) (Continued) The following specifications apply for VA VD +2.7V to +5.25V, AGND DGND 0V, f SCLK 3.2 MHz to MHz, f SAMPLE k SPS to k SPS, and CL ...

Page 5 ADC108S052 Timing Specifications 108S The following specifications apply for VA VD +2.7V to +5.25V, AGND DGND 0V, f SCLK 3.2 MHz to MHz, f SAMPLE k SPS to k SPS, and CL 50p F. Boldface limits apply fo...

Page 6 Timing Diagrams FIGURE 1. ADC108S052 Operational Timing Diagram FIGURE 2. ADC108S052 Serial Timing Diagram FIGURE 3. SCLK and CS Timing Parameters www.national.com

Page 7 second or the third order intermodulation products to the Specification Definitions sum of the power in both of the original frequencies. Second 108S ACQUISITION TIME is the time required for the ADC ...

Page 8 Typical Performance Characteristics TA +25˚C, f SAMPLE k SPS, f SCLK MHz, f IN 40.2 k Hz unless otherwise stated. DNL DNL INL INL DNL vs. Supply INL vs. Supply www.national.com

Page 9 Typical Performance Characteristics TA +25˚C, f SAMPLE k SPS, f SCLK MHz, f IN 40.2 k Hz 108S unless otherwise stated. (Continued) SNR vs. Supply THD vs. Supply ENOB vs. Supply DNL vs. VD with VA 5.0 ...

Page 10 Typical Performance Characteristics TA +25˚C, f SAMPLE k SPS, f SCLK MHz, f IN 40.2 k Hz unless otherwise stated. (Continued) INL vs. SCLK Duty Cycle SNR vs. SCLK Duty Cycle THD vs. SCLK Duty Cycle EN...

Page 11 Typical Performance Characteristics TA +25˚C, f SAMPLE k SPS, f SCLK MHz, f IN 40.2 k Hz 108S unless otherwise stated. (Continued) SNR vs. SCLK THD vs. SCLK ENOB vs. SCLK DNL vs. Temperature INL vs. T...

Page 12 Typical Performance Characteristics TA +25˚C, f SAMPLE k SPS, f SCLK MHz, f IN 40.2 k Hz unless otherwise stated. (Continued) THD vs. Temperature ENOB vs. Temperature SNR vs. Input Frequency THD vs. I...

Page 13 Figure shows the ADC108S052 in hold mode: switch SW1 1.0 Functional Description connects the sampling capacitor to ground, maintaining the 108S The ADC108S052 is successive-approximation analog-to- sa...

Page 14 1.0 Functional Description after the fall of CS. The control register is loaded with data (Continued) indicating the input channel to be converted on the subse- neously and the ADC enters track mode. ...

Page 15 tant that VA be kept as clean as possible. Due to the low 2.0 Applications Information power requirements of the ADC108S052, it is also possible to use precision reference as power supply. 2.1 TYPICAL...

Page 16 2.0 Applications Information mance degradation of the ADC108S052 due to supply noise, do not use the same supply for the ADC108S052 that is used (Continued) for digital logic. output capacitance, the ...

Page 17 Physical Dimensions inches (millimeters) unless otherwise noted 108S 8-C hannel,200 k S to k S ,10-B it /D onverter 16-Lead TSSOP Order Number ADC108S052CIMT, ADC108S052CIMTX NS Package Number MTC16 N...

Manual Details

Brand	National
Pages	17
File Size	843.81 KB
Published	June 02, 2026

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Frequently Asked Questions

What type and placement of capacitors are required for the analog supply power pin?

The V+ power pin should be bypassed by a 1 µF and a 0.1 µF monolithic ceramic capacitor located within 1 cm.

How does a conversion reading begin using this chip?

A conversion process begins on the falling edge of the CS (Chip Select) pin, and continues as long as CS is held low.

What is the maximum guaranteed operating temperature range for the ADC108S052?

The guaranteed operating temperature range is from −40°C to +105°C.

How does the converter communicate its output data to the system?

The output serial data is straight binary and can be read out on the falling edges of the SCLK pin.

NATIONAL SEMICONDUCTOR ADC108S052 User's Manual

Summary

FIGURE 1. ADC108S052 Operational Timing Diagram

FIGURE 2. ADC108S052 Serial Timing Diagram

FIGURE 3. SCLK and CS Timing Parameters

1.1 ADC108S052 OPERATION

FIGURE 4. ADC108S052 in Track Mode

FIGURE 5. ADC108S052 in Hold Mode

1.2 SERIAL INTERFACE

TABLE 1. Control Register Bits

TABLE 2. Control Register Bit Descriptions

TABLE 3. Input Channel Selection

1.3 ADC108S052 TRANSFER FUNCTION

FIGURE 6. Ideal Transfer Characteristic

1.4 ANALOG INPUTS

FIGURE 7. Equivalent Input Circuit

1.5 DIGITAL INPUTS AND OUTPUTS

2.1 TYPICAL APPLICATION CIRCUIT

FIGURE 8. Typical Application Circuit

2.2 POWER SUPPLY CONSIDERATIONS

2.2.1 Power Supply Sequence

2.2.2 Power Management

2.2.3 Power Supply Noise Considerations

2.3 LAYOUT AND GROUNDING

ADC108S052

General Description

Features

Key Specifications

Applications

Connection Diagram

Ordering Information

Block Diagram

Pin Descriptions and Equivalent Circuits

Absolute Maximum Ratings

Operating Ratings (Notes , )

Package Thermal Resistance

ADC108S052 Converter Electrical Characteristics

ADC108S052 Timing Specifications

Timing Diagrams

FIGURE 1. ADC108S052 Operational Timing Diagram

FIGURE 2. ADC108S052 Serial Timing Diagram

FIGURE 3. SCLK and CS Timing Parameters

Specification Definitions

Typical Performance Characteristics

1.0 Functional Description

1.1 ADC108S052 OPERATION

FIGURE 4. ADC108S052 in Track Mode

FIGURE 5. ADC108S052 in Hold Mode

1.2 SERIAL INTERFACE

TABLE 1. Control Register Bits

TABLE 2. Control Register Bit Descriptions

TABLE 3. Input Channel Selection

1.3 ADC108S052 TRANSFER FUNCTION

FIGURE 6. Ideal Transfer Characteristic

1.4 ANALOG INPUTS

FIGURE 7. Equivalent Input Circuit

1.5 DIGITAL INPUTS AND OUTPUTS

2.0 Applications Information

2.1 TYPICAL APPLICATION CIRCUIT

FIGURE 8. Typical Application Circuit

2.2 POWER SUPPLY CONSIDERATIONS

2.2.1 Power Supply Sequence

2.2.2 Power Management

2.2.3 Power Supply Noise Considerations

2.3 LAYOUT AND GROUNDING

Physical Dimensions

Page 1 Text Content

108S 8-C hannel,200 k S to k S ,10-B it /D onverter

ADC108S052 8-Channel, k SPS to k SPS, 10-Bit A/D Converter General Description Features

Key Specifications

Connection Diagram

Ordering Information

Page Summary Contents For NATIONAL SEMICONDUCTOR ADC108S052 User's Manual

Manual Details

Frequently Asked Questions

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