PCM1738ESLASH2K.B datasheet(32/47 Pages) TI2

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Analog Gain by Balanced Amplifier

REFERENCE CURRENT RESISTOR

APPLICATION FOR EXTERNAL DIGITAL FILTER INTERFACE

WDCK(WordClock)

DATA-L

BCK

SCK

DATA-R

DF1704

DF1706

PMD200

Mode

Control

RST

ZEROL

ZEROR

WDCK(LRCK)

DATAL (DATA)

BCK

SCKI

DGND

SCKO

MDO

MDI

AGND2

OUTL–

OUTL+

CC2

CC1

COM3

REF

COM2

COM1

AGND1

OUTR+

OUTR–

DATAR(MUTE)

Analog

OutputStage

SameasStandard

Application

B0201-01

():OriginalPinName

APPLICATIONS FOR INTERFACING WITH THE EXTERNAL DIGITAL FILTER

PCM1738

SBAS174C – FEBRUARY 2002 – REVISED FEBRUARY 2007

The I/V converters are followed by balanced amplifier stages that sum the differential signals for each channel,

creating a single-ended voltage output. In addition, the balanced amplifiers provide a second-order, low-pass

filter function that band-limits the audio output signal. The cutoff frequency and gain is given by external R and C

component values. In the case of Figure 40, the cutoff frequency is 45 kHz with a gain of 1. The output voltage

for each channel is 6.2 Vp-p, or 2.2 Vrms.

As shown in the analog output application circuit, marked R1 on Figure 40, there is a resistor connected from

IREF (pin 21) to the analog ground, designated as R1. This resistor sets the current for the internal reference

circuit. The value of R1 must be 16 kΩ, ±1% in order to match the specified gain error shown in the Electrical

Characteristics table.

Figure 41. Connection Diagram for External Digital Filter (Internal DF Bypass Mode) Application

For some applications, it may be desirable to use an external digital filter to perform the interpolation function, as

it may provide improved stop-band attenuation or other special features not available with the PCM1738's

internal digital filter.

The PCM1738 supports the use of an external digital filter, including:

• The DF1704 and DF1706 from Texas Instruments

• Pacific Microsonics PMD100 HDCD filter/decoder ICs

• Programmable digital signal processors

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