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1 Introduction
The PCM182xEVM/ PCM182xQ1EVM is an evaluation module (EVM) designed to demonstrate the performance
and functionality of the PCM182x / PCM182x-Q1 device. The devices covered are PCM1820/PCM1821/
PCM1822/PCM1820-Q1/PCM1821-Q1/PCM1822-Q1.The PCM182x/ PCM182x-Q1 is a high-performance audio
analog-to-digital converter (ADC) that is configured through logic-level mode selection pins and does not require
a digital interface such as I2C or SPI to configure registers. As such, no software is necessary to interface with
the EVM. The EVM is powered with a single 5-V supply. Access to the converter output is provided on the audio
serial interface in I2S or TDM format.
2 Power Supply
The PCM182xEVM/PCM182xQ1EVM can be powered with a single 5-V power supply connected to J6. Onboard
low dropout regulators convert the 5-V supply to the 3.3-V and 1.8-V rails used by the ADC. The analog supply,
AVDD, is fixed at 3.3 V. The digital supply, IOVDD, can be set to either 1.8 V or 3.3 V with J5. It is also possible
to power the ADC directly by removing J9 and J5 and applying a voltage directly to the AVDD and IOVDD test
points. Note that if this is done, it is important to keep J10 populated (or ensure there is a path between the pins
if the supply current is being monitored) as this jumper connects the applied IOVDD to the mode selection pins
and other circuitry that relies on IOVDD.
External
Power
J6
SBAU363A – FEBRUARY 2021 – REVISED MARCH 2022
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+5V
LDO
LDO
Figure 2-1. PCM182x /PCM182x-Q1 Power Supply
Copyright © 2022 Texas Instruments Incorporated
+3.3V
J9
+1.8V
J5
J10
PCM182xEVM/PCM182xQ1EVM EVM User's Guide
Introduction
AVDD
IOVDD
3
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