jayceebee wrote:Mark, I believe the TDA3561 was introduced to improve the range of customer brightness adjustment something that the TDA3560 was lacking in. I'm not aware of any other advantages but there may have been improvements in other areas of the ICs spec.
Additional to the TDA3560, the circuit includes the following features:
• The peak white limiter is only active during the time that the 9,3 V level at the output is exceeded. The start of the limiting function is delayed by one line period. This avoids peak white limiting by test patterns which have abrupt transitions from colour to white signals.
• The brightness control is obtained by inserting a variable pulse in the luminance channel. Therefore the ratio of brightness variation and signal amplitude at the three outputs will be identical and independent of the difference in gain of the three channels. Thus discolouring due to adjustment of contrast and brightness is avoided.
• Improved suppression of the internal RGB signals when the device is switched to external signals, and vice versa.
• Non-synchronized external RGB signals do not disturb the black level of the internal signals.
• Improved suppression of the residual 4,4 MHz signal in the RGB output stages.
• Cascoded stages in the demodulators and burst phase detector minimize the radiation of the colour demodulator inputs.
• High current capability of the RGB outputs and the chrominance output.
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