Overview
The ADV7120KST50, produced by Analog Devices Inc., is a high-speed, triple 8-bit digital-to-analog converter (DAC) designed for high-resolution color graphics and video systems. This monolithic CMOS device integrates three 8-bit DACs, each with separate input ports for red, green, and blue video data. It features a standard TTL input interface and high impedance analog output current sources. The ADV7120KST50 is ideal for applications requiring low cost, high speed DACs, and it supports video standards such as RS-343A and RS-170 without needing external buffering.
Key Specifications
| Parameter | Specification |
|---|---|
| Number of DACs | 3 (RGB) |
| Resolution | 8-bit |
| Input Interface | Standard TTL |
| Analog Output | High impedance current sources |
| Supply Voltage | +5 V |
| Reference Voltage | External 1.23 V |
| Clock Input | TTL compatible, typically pixel clock rate |
| Sync and Blank Control | TTL compatible, latched on rising edge of CLOCK |
| Integral Nonlinearity | ± 1 LSB |
| Differential Nonlinearity | ± 0.5 LSB |
| Package Options | 40-pin plastic DIP, 44-pin PLCC, 48-lead TQFP |
Key Features
- High-speed operation up to 80 MHz
- Guaranteed monotonicity with low differential and integral nonlinearity
- Compatible with RS-343A and RS-170 video standards
- Separate input ports for red, green, and blue video data
- Composite sync, blank, and reference white control inputs
- Low power dissipation due to CMOS construction
- Multiple package options for flexibility in design
Applications
- High-resolution color graphics and video systems
- High-speed communications requiring low-cost, high-speed DACs
- Video encoding and decoding systems
- Display systems compatible with RS-343A and RS-170 standards
Q & A
- What is the resolution of the DACs in the ADV7120KST50?
The DACs in the ADV7120KST50 have an 8-bit resolution.
- What are the supported video standards for the ADV7120KST50?
The ADV7120KST50 supports RS-343A and RS-170 video standards.
- What is the typical supply voltage for the ADV7120KST50?
The typical supply voltage for the ADV7120KST50 is +5 V.
- What type of input interface does the ADV7120KST50 use?
The ADV7120KST50 uses a standard TTL input interface.
- How are the sync and blank control inputs handled in the ADV7120KST50?
The sync and blank control inputs are TTL compatible and are latched on the rising edge of the CLOCK input.
- What is the maximum differential nonlinearity of the ADV7120KST50?
The maximum differential nonlinearity is ± 0.5 LSB.
- What is the maximum integral nonlinearity of the ADV7120KST50?
The maximum integral nonlinearity is ± 1 LSB.
- What are the package options available for the ADV7120KST50?
The ADV7120KST50 is available in 40-pin plastic DIP, 44-pin PLCC, and 48-lead TQFP packages.
- What is the purpose of the external 1.23 V reference voltage in the ADV7120KST50?
The external 1.23 V reference voltage is required to drive the ADV7120KST50 and is typically provided by a voltage reference such as the AD589 from Analog Devices.
- How does the ADV7120KST50 handle analog and digital ground planes in PCB design?
The ADV7120KST50 requires separate analog and digital ground planes, with the analog ground plane connecting to the regular PCB ground plane at a single point through a ferrite bead.
