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PCM1861 Datasheet(PDF) 28 Page - Texas Instruments

Part # PCM1861
Description  PCM186x 4-Channel or 2-Channel, 192-kHz, Audio ADCs
PDF  145 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

PCM1861 Datasheet(HTML) 28 Page - Texas Instruments

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VINL1/VIN1P
VINL2/VIN1M
VINL3/VIN4P
VINL4/VIN4M
VINR1/VIN2P
VINR2/VIN2M
VINR3/VIN3P
VINR4/VIN3M
MIX,
MUX
MIX,
MUX
Audio
ADC
Audio
ADC
Analog
PGAs
Digial Microphone PDM Input
(Software Controlled Devices Only)
Mic Bias
Generator
PGA
Zero-Cross Detect
Digital
PGA
Decimation and
Other Filters
Copyright © 2017, Texas Instruments Incorporated
PCM186x
28
PCM1860, PCM1861, PCM1862
PCM1863, PCM1864, PCM1865
SLAS831D – MARCH 2014 – REVISED MARCH 2018
www.ti.com
Product Folder Links: PCM1860 PCM1861 PCM1862 PCM1863 PCM1864 PCM1865
Submit Documentation Feedback
Copyright © 2014–2018, Texas Instruments Incorporated
9.3 Features Description
9.3.1 Analog Front End
The PCM186x has a flexible front end that accepts either differential or single-ended inputs. The device supports
up to 2.1 VRMS in single-ended mode, and up to 4.2 VRMS in differential mode.
The MIX and MUX circuit before the PGA allows the analog inputs to be mixed and multiplexed in both single-
ended and differential modes. Mixing functionality is available in software-controlled devices only. No individual
gain controls are available before the PGA. A high-level diagram of the front-end circuitry is shown in Figure 27.
Figure 27. High Level View of PCM186x Front End-Circuitry
DC blocking capacitors are required on the analog inputs to make sure that correct dc bias conditions are
established. Because the value of the output short-circuit protection resistor in the source product is typically
unknown, issues such as gain error and dc shift may occur if dc blocking capacitors are not used.
For systems where external amplifiers are used before the PCM186x, dc blocking capacitors are still
recommended because the input pins are designed to bias to AVDD / 2. The common mode voltage range is still
limited to the maximum input voltage of the device.
Do not connect unused analog input pins.



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