1

2

3

4

5

6

7

14

13

12

11

10

9

8

+

5 V

V R

IN

V L

IN

FMT

MD1

MD0

DOUT

BCK

V

REF

AGND

V

CC

V

DD

DGND

SCKI

LRCK

+

C

1

(1)

+

C

2

(1)

3.3 V

C

5

(3)

PCM1808

+

C

3

(2)

+

4 µs (min)

Mask

X1

(4)

PLL170x

DSP

or

Audio

Processor

L-ch IN

R-ch IN

High/Low

Pin

Setting

(5)

C

4

(2)

PCM1808

www.ti.com

SLES177B – APRIL 2006 – REVISED AUGUST 2015

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The PCM1808 device is suitable for wide variety of cost-sensitive consumer applications requiring good

performance and operation with a 5-V analog supply and 3.3-V digital supply.

8.2 Typical Application

(1)

C1, C2: A 1-

μF electrolytic capacitor gives 2.7 Hz (τ = 1 μF × 60 kΩ) cutoff frequency for the input HPF in normal

operation and requires a power-on settling time with a 60-ms time constant in the power-on initialization period.

(2)

C3, C4: Bypass capacitors, 0.1-

μF ceramic and 10-μF electrolytic, depending on layout and power supply

(3)

C5: Recommended capacitors are 0.1-

μF ceramic and 10-μF electrolytic.

(4)

X1: X1 masks the system clock input when using the clock-halt reset function with external control.

(5)

Optional external antialiasing filter could be required, depending on the application.

Figure 26. Typical Circuit Connection Diagram

8.2.1 Design Requirements

For this design example, use the parameters listed in Table 4 as the input parameters.

Table 4. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Analog input voltage range

0 Vp-p to 3 Vp-p

Output

PCM audio data

System clock input frequency

2.048 MHz to 49.152 MHz

Output sampling frequency

8 kHz to 96 kHz

Power supply

3.3 V and 5 V

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Product Folder Links: PCM1808