PCM5121 datasheet(2/107 Pages) TI1

2 / 107 page

PCM5121, PCM5122

SLAS763A – AUGUST 2012 – REVISED SEPTEMBER 2012

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This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with

appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more

susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

OTHER KEY FEATURES

The PCM512x provides 2.1VRMS ground centered

•

Integrated High-Performance Audio PLL With

outputs, allowing designers to eliminate DC blocking

BCK Reference To Generate SCK Internally

capacitors on the output, as well as external muting

circuits traditionally associated with single supply line

•

Accepts 16-, 24-, And 32-Bit Audio Data

drivers.

•

PCM Data Formats: I2S, Left-Justified, Right-

Justified, TDM

The integrated line driver surpasses all other charge-

pump based line drivers by supporting loads down to

•

SPI or I2C Control

Ω. By supporting loads down to 1kΩ, the PCM512x

•

Software or Hardware Configuration

can essentially drive up to 10 products in parallel.

•

Automatic Power-Save Mode When LRCK And

(LCD TV, DVDR, AV Receivers etc).

BCK Are Deactivated

The integrated PLL on the device removes the

•

3.3V Failsafe LVCMOS Digital Inputs

requirement for a system clock (commonly known as

•

Single Supply Operation:

master clock), allowing a 3-wire I2S connection, along

with reducing system EMI.

–

3.3V Analog, 1.8V or 3.3V Digital

In addition, the PLL is completely programmable,

•

Integrated Power-On Reset

allowing the device to become the I2S clock master

•

Small 28-pin TSSOP Package

and drive a DSP serial port as a slave. The PLL

allows a non-standard clock (up to 50MHz) to be a

APPLICATIONS

source to generate the audio-related clock (such as

24.576MHz).

•

A/V Receivers

•

DVD, BD Players

Intelligent clock error and PowerSense under voltage

protection utilizes a two level mute system for pop-

•

HDTV Receivers

free performance. Upon clock error or system power

•

Applications Requiring 2VRMS Audio Output

failure, the device digitally attenuates the data (or last

known good data), then mutes the analog circuit.

DESCRIPTION

Compared

with

existing

DAC

technology,

the

The PCM512x devices are a family of monolithic

PCM512x family offers up to 20dB lower out-of-band

CMOS integrated circuits that include a stereo digital-

noise, reducing EMI and aliasing in downstream

to-analog converter and additional support circuitry in

amplifiers/ADCs.

(from

traditional

100kHz

OBN

a small TSSOP package. The PCM512x uses the

measurements all the way to 3MHz).

latest generation of TI’s advanced segment-DAC

architecture

achieve

excellent

dynamic

The PCM512x accepts industry-standard audio data

performance and improved tolerance to clock jitter.

formats with 16- to 32-bit data. Sample rates up to

384kHz are supported.

Members of the PCM512x family integrate preset

audio

processing

functions

with

programmable

coefficients,

allowing

developers

change

the

characteristics of the interpolation filter, speaker EQ,

dynamic range controls, and average volume control

in their products.

Table 1. Differences Between PCM512x Devices

Part Number

Dynamic Range

SNR

THD

PCM5122

112dB

–93dB

PCM5121

106dB

–92dB

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