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PCM1840 датащи(PDF) 17 Page - Texas Instruments

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номер детали PCM1840
подробное описание детали  PCM1840 Quad Channel, 32-Bit, 192-kHz, Burr-BrownTM Audio ADC
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

PCM1840 датащи(HTML) 17 Page - Texas Instruments

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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


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