TDA4856

General description

The TDA4856 is a high performance and efficient solution for autosync monitors. All functions are controllable by the I²C-bus.

The TDA4856 provides synchronization processing, horizontal and vertical synchronization with full autosync capability and very short settling times after mode changes. External power components are given a great deal of protection. The IC generates the drive waveforms for DC-coupled vertical boosters such as TDA486x and TDA835x.

The TDA4856 provides extended functions e.g. as a flexible B+ control, an extensive set of geometry control facilities, and a combined output for horizontal and vertical focus signals.

Together with the I²C-bus driven Philips TDA488x video processor family, a very advanced system solution is offered.

Features

Concept features

• Full horizontal plus vertical autosync capability
• Extended horizontal frequency range from 15 to 130 kHz
• Comprehensive set of I²C-bus driven geometry adjustments and functions, including standby mode
• Very good vertical linearity
• Moire cancellation
• Start-up and switch-off sequence for safe operation of all power components
• X-ray protection
• Power dip recognition
• Flexible switched mode B+ supply function block for feedback and feed forward converter
• Internally stabilized voltage reference
• Drive signal for focus amplifiers with combined horizontal and vertical parabola waveforms
• DC controllable inputs for Extremely High Tension (EHT) compensation
• SDIP32 package.

Synchronization

• Can handle all sync signals (horizontal, vertical, composite and sync-on-video)
• Output for video clamping (leading/trailing edge selectable by I²C-bus), vertical blanking and protection blanking
• Output for fast unlock status of horizontal synchronization and blanking on grid 1 of picture tube.

Horizontal section

• I²C-bus controllable wide range linear picture position, pin unbalance and parallelogram correction via horizontal phase
• Frequency-locked loop for smooth catching of horizontal frequency
• Simple frequency preset of f_min and f_max by external resistors
• Low jitter
• Soft start for horizontal and B+ control drive signals.

Vertical section

• I²C-bus controllable vertical picture size, picture position, linearity (S-correction) and linearity balance
• Output for I²C-bus controllable vertical sawtooth and parabola (for pin unbalance and parallelogram)
• Vertical picture size independent of frequency
• Differential current outputs for DC coupling to vertical booster
• 50 to 160 Hz vertical autosync range.

East-West (EW) section

• I²C-bus controllable output for horizontal pincushion, horizontal size, corner and trapezium correction
• Optional tracking of EW drive waveform with line frequency selectable by I²C-bus.

Focus section

• I²C-bus controllable output for horizontal and vertical parabolas
• Vertical parabola is independent of frequency and tracks with vertical adjustments
• Horizontal parabola independent of frequency
• Adjustable pre-correction of delay in focus output stage.

Applications

Related applications
50-60 Hz CRT integrated DTV (TV210D)

Design support

Application Notes

AN00033_1; CM433 autosync monitor (17-May-00)

AN00039_1; Application information for TDA8359J deflection output circuit (01-Aug-00)

AN00040_1; Vertical power booster TDA4863AJ/TDA4863J (05-Jul-00)

AN00042_1; Failure mechanisms of the line output transistor (13-Jun-00)

AN00057_1; ECO-monitor (08-Nov-00)

AN01056_1; Application information for TDA8357J N2 and TDA8359J N2 deflection output circuits (01-Jan-02)

AN10114_1; Application information for TDA8358J N2 deflection output circuit with East-West amplifier (01-Jun-02)

AN10281_1; SAA4848/SAA4849 digital deflection controller plus microcontroller for CRT monitor (08-Jan-04)

Print / Email

• Print this information
• Email this information

Disclaimer

The information published on product information pages of the www.nxp.com or www.semiconductors.com websites is an extract from product data sheets and is for information purposes only. For detailed information please check the most recent version of the relevant product data sheet as published on these websites. In the event of any conflict between product information pages and data sheets or deviations from information provided in the product data sheets on these product information pages, the information provided in the product data sheets shall prevail.

The product status of the product(s) described in the product data sheet may have changed since publication of the data sheet and therefore information in datasheets on product status may be outdated. The latest information on product status is published on the product information pages of the above-mentioned websites.

As from October 1st, 2006 Philips Semiconductors has a new trade name - NXP Semiconductors, which will be used in future data sheets together with new contact details. In data sheets where the previous Philips references remain, please use the new links as shown below.

http://www.philips.semiconductors.com use http://www.nxp.com

http://www.semiconductors.philips.com use http://www.nxp.com (Internet)

sales.addresses@www.semiconductors.philips.com use salesaddresses@nxp.com (e-mail)

The copyright notice at the bottom of each page (or elsewhere in the document, depending on the version)
- © Koninklijke Philips Electronics N.V. (year). All rights reserved -
is replaced with:
- © NXP B.V. (year). All rights reserved.-

If you have any questions related to the data sheet, please contact our nearest sales office via e-mail or phone (details via salesaddresses@nxp.com). Thank you for your cooperation and understanding.