The part number "ADV7123KSTZ140" is from Analog Devices, a well-known company that specializes in analog, mixed-signal, and digital signal processing products. Specifically, the ADV7123 is a Digital-to-Analog Converter (DAC) used for video applications.
Package Type
The "KSTZ" in the model number refers to the LQFP (Low-profile Quad Flat Package), which typically has 100 pins. The "140" at the end of the part number is an indicator of the temperature grade, usually meaning it can operate within a specific temperature range.
Pin Function Specifications and Circuit Principle
Let's break down the pinout of the ADV7123. The part uses a 100-pin LQFP package, and here's a detailed explanation of all the pin functions:
Pin Function Table for ADV7123 (100-Pin LQFP) Pin Number Pin Name Function Description 1 VDD Power supply pin (Digital Power, typically 3.3V) 2 VSS Ground (Digital Ground) 3 REFOUT Output reference voltage for DAC 4 VOUT Voltage output of DAC 5 R/FS Read/Frame Sync Input (Used to synchronize input data) 6 CLKIN Clock input for synchronization of data input 7 C0 Channel 0 data input bit 0 8 C1 Channel 0 data input bit 1 9 C2 Channel 0 data input bit 2 10 C3 Channel 0 data input bit 3 11 C4 Channel 0 data input bit 4 12 C5 Channel 0 data input bit 5 13 C6 Channel 0 data input bit 6 14 C7 Channel 0 data input bit 7 15 C8 Channel 1 data input bit 0 16 C9 Channel 1 data input bit 1 17 C10 Channel 1 data input bit 2 18 C11 Channel 1 data input bit 3 19 C12 Channel 1 data input bit 4 20 C13 Channel 1 data input bit 5 21 C14 Channel 1 data input bit 6 22 C15 Channel 1 data input bit 7 23 D0 Data input bit 0 24 D1 Data input bit 1 25 D2 Data input bit 2 26 D3 Data input bit 3 27 D4 Data input bit 4 28 D5 Data input bit 5 29 D6 Data input bit 6 30 D7 Data input bit 7 31-36 GND Ground pins 37 REFIN Reference input voltage for DAC 38 VDDIO I/O Power supply (typically 3.3V) 39 RST Reset pin to initialize the DAC 40 /LD Load Data Control Pin (used to load input data into DAC) 41 /OE Output Enable Pin (controls the DAC output) 42 DACOUT0 DAC Channel 0 output pin 43 DACOUT1 DAC Channel 1 output pin 44 /FS Frame Sync Input Pin (used for synchronizing multiple devices) 45-49 VDD Additional power supply pins 50-54 GND Additional ground pins 55 BUSY Indicates if the DAC is busy processing data 56 FSYNC Frame Sync input (used to align with external devices) 57-59 AVDD Analog power pins (for the DAC circuits) 60-64 AGND Analog ground pins 65 LATCH Latch the data input for output 66-75 DATA[15:0] Data input pins (16-bit data input for DAC conversion) 76 RESET Reset input pin (used to reset the entire device) 77-100 Various Reserved Pins Reserved for future use and debuggingFAQ - Frequently Asked Questions
Q1: What is the power supply requirement for the ADV7123? A1: The ADV7123 requires a 3.3V digital power supply (VDD) and 5V analog power supply (AVDD) for proper operation.
Q2: How do I reset the ADV7123 DAC? A2: The reset pin (/RST) should be pulled low for at least one clock cycle to reset the DAC.
Q3: What is the purpose of the REFOUT pin on the ADV7123? A3: REFOUT provides a reference voltage for external components that need a stable voltage source for operations such as the analog circuits in the system.
Q4: What is the input data format for the ADV7123? A4: The ADV7123 accepts a 16-bit input data format, where 8 bits are used for each channel (for a total of two channels).
Q5: What is the function of the FSYNC pin? A5: The FSYNC pin is used for synchronization of the DAC with other devices or to align the frame timing.
Q6: Can I use a 5V supply for the ADV7123? A6: No, the ADV7123 is designed for 3.3V digital power supply and 5V analog supply.
Q7: How can I check if the ADV7123 is busy? A7: The BUSY pin indicates whether the DAC is processing or ready to accept new data.
Q8: What is the output signal format from the ADV7123? A8: The ADV7123 provides analog voltage outputs, with one channel output on DACOUT0 and another on DACOUT1.
Q9: How does the ADV7123 handle multiple input data channels? A9: The ADV7123 uses separate input pins for each channel (C0-C7 for Channel 0 and C8-C15 for Channel 1) to receive data.
Q10: How do I configure the DAC output? A10: The /OE (Output Enable) pin must be pulled low to enable the DAC output.
Q11: Can I use the ADV7123 with a 5V logic input? A11: The ADV7123 is designed for 3.3V logic level inputs; using 5V logic might damage the device.
Q12: What is the function of the LATCH pin? A12: The LATCH pin is used to latch the input data into the DAC for conversion.
Q13: How do I synchronize the DAC with external systems? A13: The R/FS pin and the FSYNC pin can be used to synchronize the ADV7123 with external systems.
Q14: Can the ADV7123 be used for video applications? A14: Yes, the ADV7123 is specifically designed for video and graphical applications, providing high-quality analog outputs from digital inputs.
Q15: What happens if I do not connect the REFOUT pin? A15: If REFOUT is not used, the DAC’s performance may degrade because external components may not have the necessary reference voltage.
Q16: How many channels does the ADV7123 support? A16: The ADV7123 supports two channels, with separate data inputs and output pins for each channel.
Q17: How can I adjust the resolution of the ADV7123? A17: The resolution is fixed at 8 bits per channel (16-bit total for two channels), and cannot be adjusted.
Q18: What is the temperature range for the ADV7123? A18: The ADV7123 operates in a standard industrial temperature range from -40°C to +85°C.
Q19: How can I connect the ADV7123 to a microcontroller? A19: The ADV7123 can be interface d with a microcontroller via its data pins (DATA[15:0]) and control pins like R/FS and /LD.
Q20: What should I do if the DAC is not producing output? A20: Ensure that the output enable (/OE) pin is properly configured, and check the input data and clock signals to ensure they are valid.
This comprehensive explanation covers the pin functions, circuit principles, and answers to some frequently asked questions about the ADV7123.
