The model "AD7798BRUZ" is a product from Analog Devices, a well-known manufacturer specializing in analog, mixed-signal, and digital signal processing ( DSP ) integrated circuits.
Package Type:
The AD7798BRUZ is typically available in a 20-lead LFCSP (Lead Frame Chip Scale Package). The LFCSP package is designed to provide a small footprint, making it ideal for space-constrained applications. The exact number of pins for this package is 20, which is the lead count in the LFCSP package.
Pin Function Specifications and Circuit Principle:
Below is a detailed table describing the function of each of the 20 pins:
Pin No. Pin Name Function Description 1 VDD Power supply input pin. Connect to the positive supply voltage (typically +2.7V to +5.25V). 2 VSS Ground pin. Connect to the system ground. 3 REFOUT Output of the reference voltage. Used for providing an external reference voltage or for monitoring. 4 REFIN Input for the external reference voltage. A voltage reference is applied here. 5 SENSE Differential input pin for analog signals. Used in combination with other analog input pins. 6 AIN2+ Positive analog input. 7 AIN2- Negative analog input. 8 AIN1+ Positive analog input. 9 AIN1- Negative analog input. 10 AIN0+ Positive analog input. 11 AIN0- Negative analog input. 12 SCLK Serial clock input pin. Used to clock data in or out of the device in serial communication. 13 SDIN Serial data input pin. Used to transmit data into the AD7798 for internal processing. 14 SDOUT Serial data output pin. Used to output processed data from the AD7798. 15 CS Chip select pin. Active low signal used to enable communication with the device. 16 RDY Ready output pin. Indicates when the data is ready to be read from the AD7798. 17 VDDIO Input voltage pin for I/O signals, separate from the main power supply (VDD). 18 IN1 Additional analog input channel, can be used for different types of sensors or signals. 19 IN2 Additional analog input channel, can be used for different types of sensors or signals. 20 N/C (No Connect) Pin that is not internally connected to any circuitry inside the device.Pin Function FAQ (Frequently Asked Questions)
Q1: What is the purpose of the VDD pin on the AD7798BRUZ? A1: The VDD pin is the power supply input for the AD7798BRUZ. It should be connected to the positive supply voltage, typically ranging from 2.7V to 5.25V.
Q2: Can the VSS pin be connected to the negative side of the power supply? A2: Yes, the VSS pin should be connected to the system ground, which is the negative side of the power supply.
Q3: What is the function of the REFOUT pin? A3: The REFOUT pin is the output for the reference voltage. It can be used either to supply an external reference voltage or to monitor the internal reference voltage of the AD7798.
Q4: How do I use the REFIN pin? A4: The REFIN pin is where you connect the external reference voltage input for the AD7798. This reference determines the analog input range of the device.
Q5: What is the role of the SENSE pin? A5: The SENSE pin is a differential analog input that can be used for various types of measurements and sensor applications.
Q6: How do I connect the analog input signals to the AD7798? A6: You connect the analog signals to the AIN0+, AIN0-, AIN1+, AIN1-, AIN2+, or AIN2- pins, depending on which channel you wish to use for input.
Q7: What is the function of the SCLK pin? A7: The SCLK pin is the serial clock input. It is used to synchronize the transmission of data to and from the AD7798.
Q8: What does the SDIN pin do? A8: The SDIN pin is used to input serial data to the AD7798. This data could be control commands or configuration information for the device.
Q9: What does the SDOUT pin do? A9: The SDOUT pin is used to output processed data from the AD7798, such as measurement results, to other devices or controllers.
Q10: What does the CS pin control? A10: The CS pin is the chip select pin. It is an active-low pin that enables or disables communication with the AD7798.
Q11: How does the RDY pin work? A11: The RDY pin signals when the AD7798 has processed data and it is ready to be read. It is typically used to synchronize data reads.
Q12: What is the significance of the VDDIO pin? A12: The VDDIO pin provides power for the I/O circuitry. It is separated from the main power supply, allowing for different voltage levels for logic signals.
Q13: Can I connect more than one analog input to the device? A13: Yes, the AD7798 has multiple analog input channels, such as AIN0, AIN1, and AIN2, which can be used for connecting various sensors or signals.
Q14: Is the N/C pin used in the circuit? A14: No, the N/C pin is not internally connected to any circuitry. It is typically not used in the design.
Q15: Can I power the AD7798 with a voltage higher than 5.25V? A15: No, the VDD pin should not exceed 5.25V to avoid damaging the internal components of the AD7798.
Q16: How do I know when the AD7798 is ready to transmit data? A16: The RDY pin will go low when data is ready to be transmitted from the AD7798.
Q17: What is the function of the AIN0, AIN1, and AIN2 pins? A17: These are the main analog input pins, which allow you to connect sensors or other analog sources to the AD7798 for measurement.
Q18: Can I use the AD7798 in differential mode? A18: Yes, the AD7798 supports differential measurements, where the positive and negative inputs (e.g., AIN0+ and AIN0-) are used together.
Q19: What type of sensors is the AD7798 compatible with? A19: The AD7798 is ideal for low-level analog sensors, such as thermocouples, strain gauges, and other differential sensors.
Q20: How should I handle the REFIN pin for optimal performance? A20: The REFIN pin should be supplied with a stable and accurate reference voltage. Typically, a low-noise reference source is recommended for best performance.
This concludes the detailed description of the pin functions, packaging, and FAQ for the AD7798BRUZ.
