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ZXCD1010EQ16 Datasheet(PDF) 4 Page - Zetex Semiconductors |
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ZXCD1010EQ16 Datasheet(HTML) 4 Page - Zetex Semiconductors |
4 / 12 page ZXCD1010 Class D controller IC A functional block diagram of the ZXCD1010 is shown in Figure 2. The on chip series regulators drop the external VCC supply (12V-18V) to the approximate 9V (9VA/9VB) and 5.5V (5V5) supplies required by the internal circuitry. A triangular waveform is generated on chip and is brought out at the OscA and OscB outputs. The frequency of this is set (to ~200kHz) by an external capacitor (Cosc) and resistor (Rosc). The triangular waveform must be externally AC coupled back into the ZXCD1010 at the TriangleA and TriangleB inputs. AC coupling ensures symmetrical operation resulting in minimal system DC offsets. TriangleA is connected to one of the inputs of a comparator and TriangleB is connected to one of the inputs of a second comparator. The other inputs of these two comparators are connected to the AudioA and AudioB inputs, which are anti-phase signals externally derived from the audio input. The triangular wave is an order higher in frequency than the audio input (max 20kHz). The outputs of the comparators toggle every time the TriangleA/B and the (relatively slow) AudioA/B signals cross. ZXCD1010 SEMICO NDUC TORS ISSUE 3 - NOVEMBER 2003 4 Out A Buffers Figure 2 Functional Block Diagram |
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