PCM4108PAPT datasheet(15/39 Pages) TI

15 / 39 page

PCM4108

SBAS354 − JUNE 2005

www.ti.com

Digital

Filtering

and

Functions

Audio

Serial

Port

SPI Port

and

Control

OUT1+

OUT1−

OUT2+

OUT2−

OUT3+

OUT3−

OUT4+

OUT4−

Digital

Power

Analog

Power

System Clock

and

Timing

CC1

AGND1

VCC2

AGND2

DGND

References

REF1+

REF1−

REF2+

REF2−

COM1

REF3+

REF3−

REF4+

REF4−

COM2

D/A Converter

and

Output Filter

D/A Converter

and

Output Filter

D/A Converter

and

Output Filter

D/A Converter

and

Output Filter

OUT5+

OUT5−

OUT6+

OUT6−

OUT7+

OUT7−

OUT8+

OUT8−

D/A Converter

and

Output Filter

D/A Converter

and

Output Filter

D/A Converter

and

Output Filter

D/A Converter

and

Output Filter

LRCK

BCK

DATA0

DATA1

DATA2

DATA3

SCKI

RST

MUTE

SUBA

SUBB

CSA

CSB

CCLK

CDIN

CDOUT

MODE

Figure 2. PCM4108 Functional Block Diagram for Software Mode

ANALOG OUTPUTS

The PCM4108 provides eight differential voltage outputs,

corresponding to audio channels 1 through 8. Refer to the

Terminal Functions table for a pin listing.

Each differential output is typically capable of providing

6.15V full-scale (differential) into a 600

Ω output load. The

output pins are internally biased to the common-mode (or

bipolar zero) voltage, which is nominally VCC/2. The output

section of each D/A converter channel includes a

single-pole, switched capacitor low-pass filter circuit. The

switched capacitor filter response tracks with the sampling

frequency of the D/A converter and provides attenuation of

the out-of-band noise produced by the delta-sigma

modulator. An external two-pole continuous time filter is

recommended to further reduce the out-of-band noise

energy and to band limit the output spectrum to

frequencies suitable for audio reproduction. Refer to the

Applications Information section of this data sheet for

recommended output filter circuits.

VOLTAGE REFERENCES

The PCM4108 includes high and low reference pins for the

output channels. VREF1+ (pin 7) and VREF1− (pin 6)

correspond to Channels 1 and 5. VREF2+ (pin 42) and

VREF2− (pin 43) correspond to Channels 2 and 6. VREF3+

(pin 55) and VREF3− (pin 56) correspond to Channels 3

and 7. VREF4+ (pin 58) and VREF4− (pin 57) correspond to

Channels 4 and 8.

The high reference (+) pin may be connected to the

corresponding VCC supply or an external +5.0V reference,

while the low reference (−) pin is connected to analog

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