Texas Instruments ADS5102 EVM, ADS5103 EVM manual Circuit Function, Analog Inputs

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Circuit Function

3.1 Circuit Function

The following paragraphs describe the function of the individual circuits. See the data sheet for device operating characteristics.

3.1.1Analog Inputs

The ADC has either transformer-coupled inputs or differential-amplifier inputs from a single-ended source. The inputs are provided via the SMA connectors

J1 and J2 on the EVM, which must be configured as follows:

-For a differential amplifier input to the ADC, a single ended source is

connected to J1. R36 and R38 must be installed, and R37 and R39 must be removed. The input has a 50-Ω terminator.

-For a 1:1 transformer coupled input to the ADC, a single ended source is

connected to J2. R36 and R38 must be removed, and R37 and R39 must be installed. The input is ac-coupled and has a 50-Ω terminator.

3.1.2External Reference Inputs

In addition to being able to use the internal reference of the ADC, a reference circuit has been included on the EVM. This circuit uses a precision 2.5-V, low-noise linear regulator as the primary source, and allows adjustment of the REFT and REFB signals to the ADC using potentiometers R27 and R28, respectively. A third source, CML, is also generated to provide an adjustable common mode voltage to be used by the transformer and differential amplifier during external reference operation. CML is adjusted by potentiometer R29. In order to use the ADC with external references, install jumpers W10 and W11, install jumper W3 between pins 2 and 3, jumper W6 between pins 1 and 2, and jumper W1 between pins 1 and 2. If REFT is set to any voltage other than 1.25 V, jumper W1 must be installed between pins 2 and 3 for optimal ADC performance. The ranges of the external reference signals are shown in Table 3–1.

Table 3–1. Reference Voltage Adjustment Ranges

Signal

Minimum Voltage

Typical Voltage

Maximum Voltage

 

 

 

 

REFT

0.9

1.25

1.6

 

 

 

 

REFB

0.3

0.75

0.9

 

 

 

 

CML

0.5

1.0

1.25

 

 

 

 

3-2

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Contents User’s Guide Important Notice EVM Important Notice EVM Warnings and Restrictions Read This First About This ManualFCC Warning Contents FiguresTables Overview TopicEVM Basic Functions Power RequirementsPurpose ADS5102/3 EVM Operational Procedure Two Pin Jumper ListSwitch power supplies on Physical Description PCB Layout Top LayerInner Layer 1, Ground Plane Inner Layer 2, Power Plane Bill of Materials Bill of MaterialsNot Installed Circuit Description Circuit Function Analog InputsClock Inputs Schematic Diagram Output Connector J15For ADS5102, R51= 4.42K 25V TYP ADC Analog Supply +1.8V Data OUT

ADS5103 EVM, ADS5102 EVM specifications

Texas Instruments is known for its innovation in analog and embedded processing technologies, and the ADS5102 and ADS5103 Evaluation Modules (EVM) exemplify this legacy. These high-performance data converters are designed to meet the needs of a wide range of applications in industrial, medical, and communication systems.

The ADS5102 and ADS5103 EVMs are equipped with high-speed analog-to-digital converters (ADCs) that boast impressive specifications. The ADS5102 features a 12-bit resolution, while the ADS5103 pushes boundaries further with 14-bit resolution, ensuring exceptional accuracy in signal conversion. Operating at a sampling rate of up to 250 MSPS, both modules enable the processing of high-frequency signals with minimal latency. This makes them ideal for applications that require real-time data acquisition and processing.

A standout feature of both EVMs is their Error Vector Magnitude (EVM) performance, which allows for low distortion and high linearity in signal processing. This characteristic is critical for applications such as communications, where signal integrity is paramount. The combination of high bit resolution and low EVM makes these devices a natural choice for advanced systems requiring clear and accurate signal representation.

Technology-wise, the EVMs utilize a high-speed deserializer for efficient transmission of data. This feature supports advanced communication protocols, enabling seamless integration with digital signal processors (DSPs) or FPGAs. The design includes flexible input options, allowing users to connect various analog sources and easily adapt the systems to different use cases.

The ADS5102 and ADS5103 EVMs also provide comprehensive software support, including TI’s high-performance software libraries. This enables users to quickly set up their evaluation environment and perform thorough testing and analysis. In addition, the modular design of the EVMs allows for easy upgrades and modifications, making them versatile tools for engineers.

In summary, the Texas Instruments ADS5102 and ADS5103 EVMs are powerful evaluation tools for high-speed, high-resolution data conversion. With their exceptional sampling rates, low distortion, and user-friendly design, they serve as vital components in the development of advanced signal processing systems across various industries. These EVMs not only demonstrate Texas Instruments' commitment to quality and innovation but also provide engineers with the essential tools needed to drive their designs forward.
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