描述 Description

General description
The TDA8757 is a triple 8-bit ADC for the digitizing of large bandwidth RGB/YUV signals at a sampling rate up to 170 Msps.
The IC supports display resolutions up to 1600 × 1200 (UXGA) at 60 Hz. The IC also includes a PLL that can be locked to the horizontal line frequency and generates the ADC clock. The PLL jitter is minimized for high resolution PC graphics applications. An external clock signal can also be used to clock the ADC.
The outputs are available either on one port up to 110 Msps or on two ports up to 170 Msps. The operating mode is selectable with the serial interface to for either I2C-bus or 3-wire serial bus (3W-bus) operation.
The clamp level, the gain and the other settings are controllable through the serial interface.

特性 Features

■ Triple 8-bit ADC
■ Sampling rate up to 170 Msps
■ IC controllable by a serial interface which can be I2C-bus or 3W-bus, selected by a TTL input pin
■ Three clamps for programming a clamping code from ?63.5 to +64 in steps of 1?2 LSB (RGB) and from +120 to +136 in steps of 1?2 LSB (YUV)
■ Three controllable amplifiers: gain controlled by the serial interface to produce a full-scale resolution of 1?2 LSB peak-to-peak
■ Amplifier bandwidth of 250 MHz
■ Low gain variation with temperature
■ PLL controllable through the serial interface to generate the ADC clock which can be locked to any line frequency of 15 to 150 kHz
■ Integrated PLL divider
■ Programmable phase clock adjustment cells
■ Internal voltage regulators
■ TTL compatible digital inputs and outputs
■ Outputs on one port or demultiplexed on two ports; selectable with the serial interface
■ Chip enable, high-impedance ADC output
■ Power-down mode
■ 1.5 W power dissipation
■ Sync on green extractor.Applications
■ RGB/YUV high-speed digitizing
■ LCD panels drive
■ LCD projection systems
■ VGA to UXGA (1600 × 1200 at 60 Hz) modes.?