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UDA1320 Datasheet(PDF) 6 Page - NXP Semiconductors |
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UDA1320 Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 20 page  2000 Jan 10 6 Philips Semiconductors Preliminary specification Low-cost stereo filter DAC UDA1320ATS 8.3 Multiple format input interface L3 mode: • I2S-bus with data word length of up to 20 bits • MSB-justified format with data word length up to 20 bits • LSB-justified format with data word length of 16, 18 or 20 bits. 8.4 Static pin mode The UDA1320ATS/N2 supports the following data input name formats in the static pin mode (via SF0 and SF1): • I2S bus with data word length of up to 20 bits • LSB-justified format with data word length of 16, 18 or 20 bits. See Table 2, for the static pin codes of the 4 formats, selectable via SF0 and SF1. The UDA1320ATS/N2 also accepts double speed data for double speed data monitoring purposes. Table 2 Input format selection using SF0 and SF1 The formats are illustrated in Fig.3. Left and right data-channel words are time multiplexed. The WS signal must have 50% duty-factor for all LSB-justified modes. For BCK and WS holds that the BCK frequency must be equal or smaller then 64 times WS, or fBCK =< 64*fWS in both L3 and static mode. 8.5 Pin compatibility In L3 interface mode the UDA1320ATS/N2 can be used on boards that are designed for the UDA1322. The software for UDA1322 can be used for the UDA1320ATS/N2 to control de-emphasis, volume control and mute and also the status settings like system clock setting and input data format. IMPORTANT: UDA1320ATS/N2 differs from the UDA1320TZ/N1 with respect to: • in the static mode 384fs is supported instead of 512fs. • the output voltage of the DAC. In the UDA1320TZ/N1 this is 800mVrms at 3.0V, now it is 1Vrms at 3.3V power supply 8.6 Interpolation filter (DAC) The digital filter interpolates from 1 to 128fs by cascading a recursive filter and a FIR filter, see Table 3. Table 3 Interpolation filter characteristics 8.7 Noise shaper The 3rd-order noise shaper operates at 128fs. It shifts in-band quantization noise to frequencies well above the audio band. This noise shaping technique enables high signal-to-noise ratios to be achieved. The noise shaper output is converted into an analog signal using a Filter-Stream DAC (FSDAC). 8.8 Filter-Stream DAC The FSDAC is a semi-digital reconstruction filter that converts the 1-bit data stream of the noise shaper to be analog output voltage. The filter coefficients are implemented as current sources and are summed at virtual ground of the output operational amplifier. In this way very high signal-to-noise performance and low clock jitter sensitivity is achieved. A post-filter is not needed due to the inherent filter function of the DAC. On-board amplifiers convert the FSDAC output current to an output voltage signal capable of driving a line output. The output voltage of the FSDAC scales linearly with the power supply voltage. FORMAT SF0 SF1 I2S0 0 LSB-justified 16 bits 0 1 LSB-justified 18 bits 1 0 LSB-justified 20 bits 1 1 ITEM CONDITION VALUE (dB) Pass-band ripple 0 to 0.45fs ±0.1 Stop band >0.55fs −50 Dynamic range 0 to 0.45fs 108 |
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