Key facts
- Brand
- Analog Devices
- Model
- AD9880
- Industry
- Industrial
- Documents
- 4
- Languages
- EN
- Last added
- 2012-08-02
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AN-775 Implementing the Auto-Offset Function on the AD9880 Application Note
The document describes the implementation of the auto-offset feature on the AD9880 Analog-to-Digital Converter (ADC). This function monitors output during the clamp period to calculate and adjust offset settings automatically. When enabled, specific registers are used as target codes for feedback, while others manage brightness adjustments using two's complement notation.
The guide provides detailed instructions on configuring Register 0x1C to enable auto-offset and setting Target Code Registers (0x09, 0x0B, 0x0D) for different signal types like RGB and YPbPr. It also explains the differences in register definitions between disabled and enabled modes and offers example settings tables.
Analog Devices AD9880 specifications
| Max Speed | 150 MHz |
|---|---|
| Resolution Support | 1080p @ 60 Hz |
| Coefficient Width | 12 bits |
| Supported Formats | RGB, YUV, YCrCb |
Source: Analog Devices AN-795 Color Space Conversion Matrix Application Note
All Analog Devices AD9880 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
How to use the product for one specific task, with worked examples.
Questions answered in these manuals
What is the effective range for adjusting offset when auto-offset is enabled?
The effective range for adjusting offset is +63/-64 LSBs.
From: AN-775 Implementing the Auto-Offset Function on the AD9880 Application Note
What values must be set in Register 0x1D for proper operation?
Register 0x1D bits 7:0 must be set to OxFF.
From: AN-775 Implementing the Auto-Offset Function on the AD9880 Application Note
What is the range of the CSC coefficients?
The coefficients can only be programmed in the range of [–0.999... +0.999].
From: Analog Devices AN-795 Color Space Conversion Matrix Application Note
How are float point coefficients converted for programming?
They must be multiplied by 4096/2^CSC_scale and rounded to 12 bits.
From: Analog Devices AN-795 Color Space Conversion Matrix Application Note
What power supplies does the AD9880 require?
The AD9880 operates from two supplies: 1.8 V for DVDD/PVDD and 3.3 V for VDD.
What is the maximum pixel‑clock frequency of the AD9880?
The pixel‑clock can be generated up to 150 MHz.