Features: All functions inclusive matrix adjustment are I2C Bus controlled Inputs for AM sound or NICAM SCART-interface Independent headphones Universal clock generation circuit build-in Clipping detector build-in Volume control High signal-to-noise ratio Extremely low total harmonic distortions H...
TDA6612-2: Features: All functions inclusive matrix adjustment are I2C Bus controlled Inputs for AM sound or NICAM SCART-interface Independent headphones Universal clock generation circuit build-in Clipping de...
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Features: · High input sensitivity· Low distortion for AM-sound application· AM detector is alignm...
Features: · Active multistandard video IF with FPLL demodulator· 12-MHz bandwidth· MAC state· Pict...
Parameter | Symbol | Limit Values | Unit | Remarks | |
min. | max. | ||||
ESD-voltage | VESD | 2 | 2 | kV | HBM (R = 1.5 kW, C = 100 pF) |
ESD-voltage | VESD7,8,9,10 | 6 | 6 | kV | HBM (R = 1.5 kW, C = 100 pF) |
Junction temperature | Tj | 150 | |||
Storage temperature | Tstg | 40 | 125 | ||
Thermal resistance system ambient |
R th SA | 53 | K/W |
The audio signal TDA6612-2 processing in the matrix and the switch-over for multi channel TV-sound signals according to the two carrier system used in Germany takes place in the matrix and switching sections. Crosstalk compensation is carried out in the sound 1 input stage. The crosstalk compensation range has an adjustment range of ± 3 dB with a step width of 0.2 dB. In addition to the two inputs for the demodulated sound carrier a two channel SCART-input and an additional mono input (e.g. for demodulated L-standard sound) are provided. The two AF (pin 1 and pin 2) inputs of TDA6612-2 can be bypassed internally in such a way that decoded stereo sound of other audio systems (NICAM) can be processed. The switching section of TDA6612-2 includes also the SCART-output with the possibility to select the sound 1 or 2 during the "dual" mode. The Ch1/Ch2-switches for the loudspeaker and headphone outputs are independently switchable.
In the signal path for the volume control unit output there is the Ch1/Ch2-switch followed by two different volume control units. The first has a control range from 0 to 15 dB with a step width of 1.25 dB. In conjunction with the main volume control after bass and treble control a high immunity against overdriving the output stage is reached. The first volume control is used as a "pre-stage" of the main volume control in conjuntion with the clipping detector. This section of TDA6612-2 is followed by a switchable quasi stereo stage which provides a stereophonic audio effect with mono signals due to a 180° phase shift at medium frequencies (about 1 kHz) in one channel. The following bass control has a control range of +15/12 dB with a step width of 3 dB. The cut-off frequency for each channel is set with an external capacitor. The implemented switchable circuit for stereo base width expansion provides a three dimensional aural reception. This is realized with a 50% frequency dependent crosstalk with opposite phase of the signal between both channels. The circuit operates with the same cut-off frequency as the bass control, but the function is widely independent. The treble control has a step width of 3 dB with an control range of +/12 dB. The cut-off frequency of the treble control is derived from one capacitor for each channel. The loudspeaker signal path is terminated with the loudspeaker control, independently adjustable for left and right. With 57 steps of 1.25 dB the adjustment range is 70 dB, where step 57 activates the "MUTE" function. Functions such as "balance" or "loudness" are realized by software and adjustment of the appropriate tone and volume controls. In the volume control unit there is a clipping detector. The status of the clipping detector can be evaluated via the I2C Bus. Therefore TDA6612-2 is possible to implement an automatic volume control using the clipping detector and software implemented into the controller.
After every evaluation the clipping bit is reset. Therefore after a read access to the clipping bit a new evaluation of the clipping detector status is possible.
The signal path of TDA6612-2 for the headphones contains a volume control after the Ch1/Ch2-switch with a common adjustment for left and right. Thirty two steps of 2 dB give an adjustment range of 62 dB (31 x2 dB = 62 dB, the 32nd step is MUTE).