The AD7192BRUZ is a precision analog-to-digital converter (ADC) from Analog Devices. It is widely used in measurement systems requiring high accuracy and low noise, particularly in applications like industrial process control, medical devices, and instrumentation.
This particular model comes in a LFCSP (Lead Frame Chip Scale Package) with 24 pins. The full pinout and detailed explanation of each pin’s function are as follows:
AD7192BRUZ Pinout (LFCSP, 24 Pins)
Pin Number Pin Name Pin Function 1 VDRIVE Digital Supply Voltage (2.7V to 3.6V). Connect to appropriate logic voltage for interface signals. 2 AVDD Analog Supply Voltage. Connect to a clean power source (typically 3.3V to 5V). 3 AGND Analog Ground. Connect to the system ground. 4 REF(+)/REF- Voltage reference input pins. REF+ is the positive reference input, REF- is the negative reference input. These control the input range of the ADC. 5 VOUT Internal reference output voltage. Can be used to provide a reference for other circuitry. 6 SDO Serial Data Output. Digital output for the conversion result in serial data format (SPI interface). 7 SCLK Serial Clock Input. Used for SPI communication, to clock in data or receive commands from the microcontroller. 8 SDI Serial Data Input. Digital input for data transfer in SPI communication. 9 CS Chip Select. Used to enable/disable the device for SPI communication. 10 DRDY Data Ready. This output goes low when a new conversion result is ready. Can be used to trigger data processing. 11 AIN1 Analog Input Channel 1. Used for measurement of the input signal in differential mode. 12 AIN2 Analog Input Channel 2. Used for measurement of the input signal in differential mode. 13 AIN3 Analog Input Channel 3. Typically used for single-ended measurement. 14 AIN4 Analog Input Channel 4. Typically used for single-ended measurement. 15 AGND Analog Ground. Connect to the system ground. 16 VOUT Internal reference output voltage. Can be used to provide a reference for other circuitry. 17 RESET Reset Pin. Used to reset the chip to its initial state. 18 REXT External Resistor. Used to connect an external resistor for controlling the reference input for the ADC. 19 RDY Read Data. Used to read the digital output of the ADC. 20 VCC Digital Supply Voltage (2.7V to 3.6V). Provides power to the digital circuitry. 21 AGND Analog Ground. Connect to the system ground. 22 SCLK Serial Clock Input. Used for SPI communication, to clock in data or receive commands from the microcontroller. 23 REF- Negative Reference Input. Connect to an appropriate reference ground. 24 AVSS Analog Supply Ground. Connect to the system ground to complete the power supply circuit.FAQ (Frequently Asked Questions)
What is the AD7192BRUZ model used for? The AD7192BRUZ is an ultra-low noise, 24-bit ADC used for precision measurements in industrial, medical, and other sensor-based applications.
How should I connect the AVDD and AGND pins of the AD7192BRUZ? AVDD should be connected to a stable 3.3V to 5V supply, and AGND should be connected to the system ground to provide the correct analog power and ground for the ADC.
What is the purpose of the REF+ and REF- pins? The REF+ and REF- pins control the input range of the ADC. They should be connected to a stable reference voltage source to ensure accurate conversion.
Can I use the VOUT pin to power other components? The VOUT pin is an internal reference output voltage that can be used to power other components, but ensure that the current drawn does not exceed the recommended limits.
What is the function of the SDO pin? The SDO pin is used for serial data output. It outputs the conversion result of the ADC in SPI format, which can be read by a microcontroller.
How do I communicate with the AD7192BRUZ? The AD7192BRUZ communicates using the SPI interface, with the SDO, SCLK, SDI, and CS pins used for data transfer and control.
What should I do if the DRDY pin remains low? The DRDY pin going low indicates that a new conversion result is ready. If it stays low, check the setup of the conversion or ensure that the chip is not stuck in an idle state.
How can I reset the AD7192BRUZ? Use the RESET pin to reset the device to its initial state. Pull this pin low for a brief period to initiate a reset.
What voltage range should I use for the AVDD pin? The AVDD pin should be connected to a supply voltage in the range of 3.3V to 5V to ensure proper operation of the analog circuitry.
What is the purpose of the RDY pin? The RDY pin is used to read the output of the ADC. When a conversion is complete, the RDY pin is activated to indicate data is available for reading.
What is the correct way to use the AIN1, AIN2, AIN3, and AIN4 pins? These pins are used for connecting analog input signals. AIN1 and AIN2 are typically used in differential mode, while AIN3 and AIN4 can be used for single-ended measurements.
Can I drive the REF+ and REF- pins with a single-ended reference voltage? Yes, you can use a single-ended reference voltage if the desired measurement is within the acceptable input range.
What is the typical noise performance of the AD7192BRUZ? The AD7192BRUZ provides low noise and high resolution, making it suitable for high-precision measurement applications.
How do I power the AD7192BRUZ? The AD7192BRUZ requires both an analog power supply (AVDD) and a digital power supply (VCC). Ensure both are connected as per the datasheet recommendations.
Is it possible to daisy-chain multiple AD7192BRUZ devices using SPI? Yes, multiple devices can be connected in a daisy chain configuration by connecting the SDO pin of one device to the SDI pin of the next device.
Can the AD7192BRUZ operate with a 3.3V supply? Yes, the AD7192BRUZ can operate with a 3.3V supply as long as it meets the recommended voltage levels for both the analog and digital supplies.
What is the maximum sampling rate of the AD7192BRUZ? The AD7192BRUZ has a maximum sampling rate of 4.17 kSPS (samples per second).
How should I connect the AGND and AVSS pins? Both AGND and AVSS should be connected to the same ground reference to ensure proper operation of the ADC.
What type of external resistor should be used with the REXT pin? The external resistor connected to the REXT pin controls the reference input and should match the values specified in the datasheet to achieve optimal performance.
Can the AD7192BRUZ be used with a differential input signal? Yes, the AD7192BRUZ is capable of measuring differential input signals when configured to use the AIN1 and AIN2 pins for differential inputs.
This completes the detailed explanation of the AD7192BRUZ's pinout, function, and FAQs.
