PCM4104IPFBREP datasheet(14/43 Pages) TI

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LRCK

BCK

DATA0

DATA1

SCKI

RST

MUTE

SUB

CCLK

CDIN

CDOUT

MODE

REF1+

OUT1+

OUT1−

REF1−

REF2+

OUT2+

OUT2−

REF2−

COM1

REF3+

OUT3+

OUT3−

REF3−

REF4+

OUT4+

OUT4−

REF4−

COM2

Digital

Filtering

and

Functions

Audio

Serial

Port

Control

and

SPI Port

Digital

Power

Analog

Power

System Clock

and

Timing

CC1

AGND1

CC21

AGND2

DGND

D/A Converter

and

Output Filter

D/A Converter

and

Output Filter

D/A Converter

and

Output Filter

D/A Converter

and

Output Filter

ANALOG OUTPUTS

PCM4104-EP

SBAS419 – JUNE 2007

PRODUCT OVERVIEW (continued)

Figure 2. PCM4104 Functional Block Diagram for Software Mode

The PCM4104 provides four differential voltage outputs, corresponding to audio channels 1 through 4. VOUT1+

(pin 1) and VOUT1– (pin 2) correspond to Channel 1. VOUT2+ (pin 47) and VOUT2– (pin 46) correspond to Channel

2. VOUT3+ (pin 38) and VOUT3– (pin 39) correspond to Channel 3. VOUT4+ (pin 36) and VOUT4– (pin 35)

correspond to Channel 4.

Each differential output is typically capable of providing 6.15-V 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.

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