Overview
The AD9985KSTZ-110, produced by Analog Devices Inc., is a highly integrated analog interface designed for flat panel display applications. This device features a 110 MSPS triple analog-to-digital converter (ADC) with an internal 1.25 V reference, a phase-locked loop (PLL), and programmable gain, offset, and clamp control. It operates with a single 3.3 V power supply and supports three-state CMOS outputs that can be powered from 2.5 V to 3.3 V. The AD9985 includes full sync processing for composite sync and sync-on-green applications, making it versatile for various display systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 8 | 8 | 8 | Bits |
| Differential Nonlinearity (25°C) | ±0.5 | +1.25/–1.0 | ±1.45/–1.0 | LSB |
| Integral Nonlinearity (25°C) | ±0.5 | ±1.85 | ±2.3 | LSB |
| Analog Input Voltage Range | 0.5 | 1.0 | V p-p | |
| Gain Tempco (25°C) | 100 | ppm/°C | ||
| Input Bias Current (25°C) | 1 | 2 | µA | |
| Supply Voltage (VD, VDD, PVD) | 3.15 | 3.3 | 3.45 | V |
| Supply Current (VD, VDD, PVD) at 25°C | 132 | mA | ||
| Total Power Dissipation | 525 | 760 | mW | |
| Analog Bandwidth (25°C) | 300 | MHz |
Key Features
- Triple 8-bit ADC with up to 110 MSPS conversion rate
- Internal 1.25 V reference and PLL for generating pixel clock from Hsync input
- Programmable gain, offset, and clamp control
- Full sync processing for composite sync and sync-on-green applications
- Three-state CMOS outputs with 2.5 V to 3.3 V power supply compatibility
- Sampling phase adjustment and data, Hsync, and clock output phase relationships maintenance
- Clamp signal generation internally or via user input
- Fully programmable via a 2-wire serial interface
Applications
The AD9985KSTZ-110 is primarily designed for flat panel display applications, including LCD and plasma displays. It is also suitable for other high-speed analog-to-digital conversion needs in various display systems, such as medical imaging, industrial imaging, and consumer electronics.
Q & A
- What is the maximum conversion rate of the AD9985KSTZ-110?
The maximum conversion rate of the AD9985KSTZ-110 is 110 MSPS. - What is the resolution of the ADCs in the AD9985KSTZ-110?
The resolution of the ADCs is 8 bits. - What is the typical power supply voltage for the AD9985KSTZ-110?
The typical power supply voltage is 3.3 V. - Does the AD9985KSTZ-110 support sync-on-green applications?
Yes, it supports full sync processing for composite sync and sync-on-green applications. - How is the pixel clock generated in the AD9985KSTZ-110?
The pixel clock is generated by the on-chip PLL from the Hsync input. - What is the range of the analog input voltage for the AD9985KSTZ-110?
The analog input voltage range is from 0.5 V p-p to 1.0 V p-p. - Is the AD9985KSTZ-110 programmable?
Yes, it is fully programmable via a 2-wire serial interface. - What is the typical analog bandwidth of the AD9985KSTZ-110?
The typical analog bandwidth is 300 MHz. - What are the typical supply currents for VD, VDD, and PVD at 25°C?
The typical supply currents are 132 mA for VD, 19 mA for VDD, and 8 mA for PVD. - What is the total power dissipation of the AD9985KSTZ-110?
The total power dissipation is typically 525 mW to 760 mW.
