LRCK

BC K

DATA

FSX

C LKR

DR

System C lock

P C M 42 0 2

D S P

SC KI

LRCK

BCK

DATA

t

BC KDO

t

BCKP

t

BCKHL

t

LRCKHL

t

LRCKH L

t

LRCKH L

P A R A M E T E R

D E S C R I P T I O N

M I N

M A X

U N I T S

5

µs

2.25

µs

78

ns

35

ns

ns

10

LRCK P e riod

LRCK High/Low Tim e

BCK P e riod

BCK High/Low Tim e

S DOUT Da ta Output De la y from BCK Fa lling Edg e

t

LRCKP

t

LRCKHL

t

BCKP

t

BCKH L

t

BCKDO

PCM4202-EP

SGLS388

– JUNE 2007

www.ti.com

In Slave mode, the BCK and LRCK signals are inputs, with the clocks being generated by a master timing

source, such as a DSP serial port, PLL clock synthesizer, or a crystal oscillator/divider circuit. The BCK rate is

Although other BCK clock rates are possible, they are not recommended as a result if potential clock phase

sensitivity issues, which can degrade the dynamic performance of the PCM4202. The LRCK clock must be

Figure 5 illustrates the typical audio serial port connections between a PCM4202 and an audio signal processor

when using the PCM output data formats. Figure 6 illustrates the audio serial port timing for both the Master and

Slave modes of operation.

DSD OUTPUT MODE OPERATION

The output port DSD mode operation consists of a single DSD data clock signal, DSDBCK (pin 17), along with

two synchronous DSD data lines, DSDR (pin 15) and DSDL (pin 16). The data lines correspond to Right and Left

channels, respectively. The DSD output rate is determined by the sampling mode settings for the device,

discussed in the Sampling Modes section of this datasheet.

For DSD output data, the serial port is configured in Master mode, with the DSDBCK derived from the system

clock input, SCKI. The DSDBCK is equivalent to the oversampling clock supplied to the delta-sigma modulators.

The DSD data outputs, DSDR through DSDL, are synchronous to the DSDBCK. The clock and data lines are

then connected to a data capture or processing device.

Figure 7 illustrates the DSD port timing for both the DSD output mode.

18

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© 2007, Texas Instruments Incorporated

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