Описание
The TDA9955HL is a triple 8-bit video converter interface. The TDA9955HL converts an RGB analog signal into a RGB or YUV (YCBCR) digital signal or converts a YUV (YPBPR) analog signal into a YUV (YCBCR) or RGB digital signal with a sampling rate up to 170 MHz. The TDA9955HL supports analog TV resolutions from 480i (720 × 480i at 60 Hz) to High-Definition TV (HDTV) (up to 1920 × 1080p at 60 Hz) and analog PC resolutions from VGA (640 × 480p at 60 Hz) to UXGA (1600 × 1200p at 60 Hz). The YUV digital output signal can be 4 : 4 : 4 or 4 : 2 : 2 ITU-R BT.656 standard or semi-planar format following the ITU-R BT.601 standard. All settings are controlled via the I2C-bus.
- Triple 8-bit Analog-to-Digital Converter (ADC)
- Three independent analog video sources, up to 170 MHz selectable via the I2C-bus
- Analog composite sync slicer and recognition integrated
- Frame and field detection for interlaced video signal
- Video analog voltage input from 0.45 V to 0.9 V (p-p) to produce a full-scale ADC input of 1.0 V (p-p)
- Three clamps for programming a 8-bit clamping code from 0 to +191 in steps of 1 LSB for RGB and YUV signals
- Three video amplifiers controlled via I2C-bus to reach the full-scale resolution
- Amplifier bandwidth of 100 MHz
- Low gain variation with temperature
- I2C-bus controlled Phase-Locked Loop (PLL) to generate the ADCs, formatter and output clocks which can be locked into a line frequency from 15 kHz to 95 kHz
- Integrated PLL divider
- Programmable clock phase adjustment cells
- Matrix and offsets available for conversion of RGB or YUV signal coming from analog video sources into YUV or RGB
- Output format RGB 4 : 4 : 4, YUV 4 : 4 : 4, YUV 4 : 2 : 2 ITU-R BT.656 or YUV4:2:2 semi-planar standard on output bus
- Integrated downsampling-by-two with selectable filters on CB and CR channels in the 4:2:2 mode
- IC controlled via the I2C-bus, 5 V tolerant and bit rate up to 400 kbit/s
- TTL inputs 5 V tolerant
- LV-TTL outputs
- Power-down mode
- 1.8 V and 3.3 V power supplies
