PCM5121 datasheet(60/121 Pages) TI2

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PCM186x

DAC

Reference

PLL

Oscillator

AVDD 3.3V

CPVDD 3.3V

Digital IO

Digital Core

( ^W[•, Logic etc)

DVDD (1.8V or 3.3v)

1.8V LDO

Clock Halt Detect

LDOO 1.8V

Analog Circuits

Digital Circuits

Power Circuits

Line Driver

Charge Pump

PCM5121, PCM5122

SLAS763C – AUGUST 2012 – REVISED OCTOBER 2018

www.ti.com

Product Folder Links: PCM5121 PCM5122

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10 Power Supply Recommendations

10.1 Power Supply Distribution and Requirements

The PCM512x devices are powered through the pins shown in Figure 77.

Figure 77. Power Distribution Tree Within PCM512x

Table 46. Power Supply Pin Descriptions

NAME

USAGE / DESCRIPTION

AVDD

Analog voltage supply; must be 3.3 V. This powers all analog circuitry that the DAC runs on.

DVDD

Digital voltage supply. This is used as the I/O voltage control and the input to the onchip LDO.

CPVDD

Charge Pump Voltage Supply - must be 3.3 V

LDOO

Output from the onchip LDO. Should be used with a 0.1-µF decoupling cap. Can be driven (used as power

input) with a 1.8-V supply to bypass the onchip LDO for lower power consumption.

AGND

Analog ground

DGND

Digital ground

10.2 Recommended Powerdown Sequence

Under certain conditions, the PCM512x devices can exhibit some pops on power down. Pops are caused by a

device not having enough time to detect power loss and start the muting process.

The PCM512x devices have two auto-mute functions to mute the device upon power loss (intentional or

unintentional).

10.2.1 XSMT = 0

When the XSMT pin is pulled low, the incoming PCM data is attenuated to 0, closely followed by a hard analog

mute. This process takes 150 sample times (ts) + 0.2 ms.

Because this mute time is mainly dominated by the sampling frequency, systems sampling at 192 kHz will mute

much faster than a 48-kHz system.

10.2.2 Clock Error Detect

When clock error is detected on the incoming data clock, the PCM512x devices switch to an internal oscillator,

and continue to the drive the output, while attenuating the data from the last known value. Once this process is

complete, the PCM512x outputs are hard muted to ground.

PCM5121 Datasheet(PDF) 60 Page - Texas Instruments

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