WM8903 datasheet(172/178 Pages) WOLFSON

172 / 178 page

WM8903

Production Data

PD, Rev 4.5, June 2012

172

APPLICATIONS INFORMATION

RECOMMENDED EXTERNAL COMPONENTS

Figure 67 Recommended External Components

Notes:

Decoupling Capacitors

X5R ceramic capacitor is recommended for capacitors C1, C2, C3, C4, C6, C7, C12 and C13.

All decoupling capacitors should be positioned as close to the WM8903 as possible.

The positioning of C12 and C13 is particularly important - these should be as close to the WM8903 as possible.

Charge Pump Capacitors

Specific recommendations for C5, C6 and C7 are provided in Table 85. Note that two different recommendations are provided

for these components; either of these components is suitable, depending upon size requirements and availability.

The positioning of C5 is very important - this should be as close to the WM8903 as possible.

It is important to select a suitable capacitor type for the Charge Pump. Note that the capacitance may vary with DC voltage;

care is required to ensure that required capacitance is achieved at the applicable operating voltage, as specified in Table 85.

The capacitor datasheet should be consulted for this information.

COMPONENT

REQUIRED

CAPACITANCE

VALUE

PART NUMBER

VOLTAGE

TYPE

SIZE

C5 (CFB1-CFB2)

 1F at 2VDC

2.2

F

Kemet C0402C225M9PAC

6.3v

X5R

0402

2.2

F

MuRata GRM155R60J225ME15_EIA

6.3v

X5R

0402

C6 (VNEG)

C7 (VPOS)

 2F at 2VDC

2.2

F

MuRata GRM188R61A225KE34D

10v

X5R

0603

4.7

F

MuRata GRM155R60J475M_EIA

6.3v

X5R

0402

Table 85 Charge Pump Capacitors

WM8903 Datasheet(PDF) 172 Page - Wolfson Microelectronics plc

WM8903 Datasheet(HTML) 172 Page - Wolfson Microelectronics plc

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 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL