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TDA1386T Datenblatt(PDF) 11 Page - NXP Semiconductors |
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TDA1386T Datenblatt(HTML) 11 Page - NXP Semiconductors |
11 / 24 page 1998 Jan 06 11 Philips Semiconductors Product specification Noise shaping filter DAC TDA1386T There are two recommended application situations within the microcontroller mode: • The customer wants to use the microcontroller interface without the volume setting facility. In this event the operation is as follows: – Mute ON; by sending the MUSB command – Mute OFF; by sending the FS command – Attenuation ON; by sending the ATSB command – Attenuation OFF; by sending the FS command. It is possible to switch from ‘Attenuation ON’ to ‘Mute ON’ but not vice-versa. • Incorporating the volume control feature operates as follows: – Mute ON; by sending the MUSB command the microcontroller has to store the previous volume setting. – Mute OFF; by sending succeeding INCR commands until the previous volume is reached. – Attenuation ON; by sending succeeding DECR commands until a relative downstep of −12 dB is reached. The microcontroller has to store the previous volume. – Attenuation OFF; by sending the succeeding INCR commands until the previous volume is reached. – Volume UP; by sending successive INCR commands. – Volume DOWN; by sending successive DECR commands. De-emphasis A digital de-emphasis is implemented in the TDA1386T. By selecting the DEEM bit at register D4 (microcontroller application mode) or activating the APP0 pin (pseudo-static application mode), de-emphasis can be applied by means of an IIR filter. De-emphasis is synchronized to prevent operation in the middle of a word. Double-speed mode The double-speed mode is controlled by the DSMB bit at register D6 (microcontroller application mode) or by activating the APP1 pin (pseudo static application mode). When the control bit is active LOW the device operates in the double-speed mode. Oversampling filter and noise shaper The digital filter is a four times oversampling filter. It consists of two sections which each increase the sample rate by 2. The noise-shaper operates on 4fs and reduces the in-band noise density. DAC and operational amplifiers In this noise shaping DAC a special data code and bidirectional current sources are used in order to achieve true low-noise performance. The special data code guarantees that only small values of current flow to the output during small signal passages while larger positive or negative values are generated using the bidirectional current sources. The noise shaping DAC uses the continuous calibration conversion technique. The DAC currents are repeatedly generated from one single reference current. The operational amplifiers and the internal conversion resistors RCONV1 and RCONV2 convert the DAC current to an output voltage available at VOL and VOR. Connecting an external capacitor between FILTCL and VOL, FILTCR and VOR respectively provides the required first-order post filtering. |
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