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PCM1840 датащи(PDF) 17 Page - Texas Instruments |
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PCM1840 датащи(HTML) 17 Page - Texas Instruments |
17 / 34 page Normalized Frequency (1/fS) 5E-5 0.0001 0.0005 0.001 0.005 0.01 0.05 -24 -21 -18 -15 -12 -9 -6 -3 0 3 DPlo HPF -3 dB Cutoff = 0.00025 u fS DRE Amplifier ADC Configurable Decimation Filters HPF DRE INP INM Output Channel Data to Audio Bus 17 PCM1840 www.ti.com SBAS989 – APRIL 2019 Product Folder Links: PCM1840 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated 7.3.7 Signal-Chain Processing The PCM1840 signal chain is comprised of very-low-noise, high-performance, and low-power analog blocks and highly flexible and programmable digital processing blocks. The high performance and flexibility combined with a compact package makes the PCM1840 optimized for a variety of end-equipments and applications that require multichannel audio capture. Figure 22 shows a conceptual block diagram that highlights the various building blocks used in the signal chain, and how the blocks interact in the signal chain. Figure 22. Signal-Chain Processing Flowchart The front-end dynamic range enhancer (DRE) gain amplifier is very low noise, with a 123-dB dynamic range performance. Along with a low-noise and low-distortion, multibit, delta-sigma ADC, the front-end DRE gain amplifier enables the PCM1840 to record a far-field audio signal with very high fidelity, both in quiet and loud environments. Moreover, the ADC architecture has inherent antialias filtering with a high rejection of out-of-band frequency noise around multiple modulator frequency components. Therefore, the device prevents noise from aliasing into the audio band during ADC sampling. Further on in the signal chain, an integrated, high- performance multistage digital decimation filter sharply cuts off any out-of-band frequency noise with high stop- band attenuation. The device supports an input signal bandwidth up to 80 kHz, which allows the high-frequency non-audio signal to be recorded by using a 176.4-kHz (or higher) sample rate. 7.3.7.1 Digital High-Pass Filter To remove the DC offset component and attenuate the undesired low-frequency noise content in the record data, the device supports a fixed high-pass filter (HPF) with –3-dB cut-off frequency of 0.00025 × fS. The HPF is not a channel-independent filter but is globally applicable for all the ADC channels. This HPF is constructed using the first-order infinite impulse response (IIR) filter, and is efficient enough to filter out possible DC components of the signal. Table 6 shows the fixed –3-dB cutoff frequency value. Figure 23 shows a frequency response plot for the HPF filter. Table 6. HPF Cutoff Frequency Value -3-dB CUTOFF FREQUENCY VALUE -3-dB CUTTOFF FREQUENCY AT 16 kHz SAMPLE RATE -3-dB CUTTOFF FREQUENCY AT 48 kHz SAMPLE RATE 0.00025 × fS 4 Hz 12 Hz Figure 23. HPF Filter Frequency Response Plot |
Аналогичный номер детали - PCM1840 |
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Аналогичное описание - PCM1840 |
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