PCM1691 datasheet(13/47 Pages) TI

13 / 47 page

PRODUCT OVERVIEW

ANALOG OUTPUTS

VOLTAGE REFERENCE VCOM

PCM1691

www.ti.com.............................................................................................................................................................................................. SBAS450 – OCTOBER 2008

The PCM1691 is a high-performance, multi-channel DAC targeted for consumer audio applications such as

Blu-ray Disc players and DVD players, as well as home multi-channel audio applications (such as home theater

systems and A/V receivers). The PCM1691 consists of an eight-channel DAC. The DAC output type is fixed with

a single-ended configuration. The PCM1691 supports 16-/20-/24-/32-bit linear PCM input data in I2S and

left-justified audio formats, and 24-bit linear PCM input data in right-justified, DSP, and TDM formats with various

sampling frequencies from 8 kHz to 192 kHz. The TDM format is useful for saving the interface bus line number

for multi-channel audio data communication between the DAC and the digital audio processor. The PCM1691

offers three modes for device control: two-wire I2C software, three-wire SPI software, and hardware.

The PCM1691 includes an eight-channel DAC, with single-ended voltage outputs pins. The full-scale output

voltage is (0.8 × VCC1) VPP in single-ended output mode. These single-ended outputs are each capable of

driving 0.8 × VCC1 (4 VPP) typical into a 5-kΩ ac-coupled load with VCC1 = +5 V. The internal output amplifiers

for VOUT1 through VOUT8 are biased to the dc common voltage, equal to (0.5 × VCC1).

The output amplifiers include an RC continuous-time filter that helps to reduce the out-of-band noise energy

present at the DAC outputs as a result of the noise shaping characteristics of the PCM1691 delta-sigma (

ΔΣ)

DACs. The frequency response of this filter is shown in the Analog Filter Characteristic (Figure 10) of the Typical

Characteristics. By itself, this filter is not enough to attenuate the out-of-band noise to an acceptable level for

most applications. An external low-pass filter is required to provide sufficient out-of-band noise rejection. Further

discussion of DAC post-filter circuits is provided in the Application Information section.

Table 1. Pin Assignments in Single-Ended Output Mode

DIGITAL INPUT

CHANNEL

SINGLE-ENDED OUTPUT

1 (DAC1)

VOUT1

DIN1

2 (DAC2)

VOUT2

3 (DAC3)

VOUT3

DIN2

4 (DAC4)

VOUT4

5 (DAC5)

VOUT5

DIN3

6 (DAC6)

VOUT6

7 (DAC7)

VOUT7

DIN4

8 (DAC8)

VOUT8

The PCM1691 includes a pin for the common-mode voltage output, VCOM. This pin should be connected to the

analog ground via a decoupling capacitor. This pin can also be used to bias external high-impedance circuits, if

they are required.

Submit Documentation Feedback

Product Folder Link(s): PCM1691

PCM1691 датащи(PDF) 13 Page - Texas Instruments

PCM1691 датащи(HTML) 13 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47

датащи скачать

ссылки URL