Texas Instruments APA100 manual Power−Up/Down Sequence, Reset Button/Mute, Error Signals

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Power−Up/Down Sequence

Power Up

6)Press and hold the RESET button (S1)

7)Verify correct voltage and input polarity, and set the external power supply to on.

8)Depress the RESET button (S1).

The EVM begins operation.

9)Adjust the signal source level as needed.

10)Hold RESET button (S1) while powering down

3.2 Power−Up/Down Sequence

The RESET pin of the TAS5111 needs to be held low while turning on power. This enables the feedback loop to get settled and avoids a loud pop. An RC filter was placed on the board to help with this, but for optimal pop perfor- mance, hold the RESET button (S1) during start-up. The RESET button should also be held during power-off to reduce power-off pop.

3.3 Reset Button/Mute

The reset button (S1) controls the RESET pin of the TAS5111. This pin keeps the outputs of the TAS5111 from switching and can also be used as a mute button. This is valuable because it allows the feedback loop to stay active and minimizes the pop going into and coming out of mute.

3.4 Error Signals

The APA100 board has test points to monitor the error signals from the TAS5111. Test points SD and OTW gives TAS5111 state information as described in Table 3−1.

Table 3−1. TAS5111 Error Decoding

OTW SD

 

DESCRIPTION

0

0

Overtemperature error ( Tj>150_C )

 

 

 

0

1

Overtemperature warning ( Tj >125_C )

 

 

 

1

0

Overcurrent (>8 A) or undervoltage (GVDD < 7 V) error

 

 

 

1

1

Normal operation, no errors/warnings

EVM Operation

3-3

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Contents User’s Guide Important Notice About This Manual Read This FirstRelated Documentation From Texas Instruments Contents Tables FiguresEVM Overview Power Requirements Features2 TPA2001D1 and TLV2464A Supply Voltage 3-V Reference EVM Basic Function/Block Diagram−2. APA100 EVM Block Diagram PCB Design Split Ground Plane PCB LayoutBridge Layout PCB Layers −4. Bottom Copper and Silkscreen Bill of Materials −1. Parts ListSchematic Page EVM Operation Quick Start Power SupplyPower−Up/Down Sequence Reset Button/MuteError Signals Changing the Gain Technical Information Feedback System Design −1 shows the block diagram of the feedback loop−2. Open− and Closed−Loop Frequency Response −4. APA100 Integrator Design Feedback System Design −5. Pspice Circuit for Simulating the Feedback −6. Pspice Simulation of Open−Loop Response TPA2001D1 Class-D Modulator−7. TPA2001D1 Block Diagram TAS5111 H-Bridge TLV2464A Gain Setting and Feedback−9. APA100 Output Filter LC Filter−1. TAS5111 Thermal Table ThermalThermal Measured Results −1. APA100 THD+N vs Frequency With 4- W Load Total Harmonic Distortion + Noise−3. APA100 THD+N vs Output Power With 4- W Load −5. APA100 Output Power vs Supply Voltage With 4- W Load Output PowerEfficiency −7. APA100 Efficiency vs Output Power With 4- W LoadSignal-to-Noise Ratio SNR Gain and Phase ResponseSupply Ripple Rejection

APA100 specifications

Texas Instruments is known for its innovation in the field of analog and embedded processing, with the APA100 being one of its noteworthy products. The APA100 is an advanced analog front-end (AFE) device designed to meet the needs of various applications including industrial, automotive, medical, and consumer electronics.

One of the standout features of the APA100 is its high-resolution data conversion capability. It integrates both analog-to-digital converters (ADCs) and digital-to-analog converters (DACs), providing unmatched precision and accuracy in signal processing. The device supports multiple sampling rates, which allows it to adapt to various requirements in different applications, ensuring optimal performance.

The power efficiency of the APA100 is another significant characteristic. Designed with low-power consumption in mind, it enables battery-operated devices to maximize their lifespan while maintaining reliable performance. This energy efficiency makes the APA100 suitable for wearables and portable medical devices, where power management is critical.

In addition to its power efficiency, the APA100 features integrated signal conditioning, which includes amplifiers and filters that enhance the quality of the input signals. This capability reduces the need for external components, thereby simplifying system design and reducing overall costs. With its built-in signal conditioning, engineers can expect improved accuracy and reduced noise in their measurements.

Texas Instruments has also included advanced communication interfaces in the APA100, such as SPI and I2C, to facilitate seamless integration with microcontrollers and processors. This flexibility allows for easy implementation into existing systems, enabling developers to take full advantage of the device's features without extensive re-engineering.

The APA100 is also designed for robustness, featuring a wide operating temperature range, making it suitable for use in harsh environments. This reliability is crucial for industrial applications where device performance can be affected by temperature fluctuations.

Overall, the Texas Instruments APA100 is an exceptional analog front-end device that combines high precision, low power consumption, integrated signal conditioning, and robust design. Its versatile features make it an ideal choice for various applications, paving the way for advancements in technology and improved performance across different sectors. With the APA100, engineers have a powerful tool that can help them innovate and enhance their products in highly competitive markets.
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