3886 datasheet(241/380 Pages) RENESAS

241 / 380 page

3886 Group User’s Manual

APPLICATION

2.8 D-A Converter

2-124

2.8.3 D-A converter application example

(1)

Speaker output volume modulation

Outline: The volume of a speaker output is modulated by using D-A converter.

Specifications: •Timer X modulates the period of sound for the pitch interval, so that a fixed pitch

(“la”: approx. 440 Hz) can be output. Modulating the amplitude with the D-A output

value controls the volume.

•Use f(XIN) = 6 MHz.

•Use DA1 (P56/DA1 pin) as D-A converter.

Figure 2.8.5 shows a peripheral circuit example and Figure 2.8.6 shows a speaker output example.

Figure 2.8.7 shows the relevant registers setting.

Fig. 2.8.5 Peripheral circuit example

Fig. 2.8.6 Speaker output example

Amplification

circuit

Power

amplifier

3886 Group

P56/DA1

VREF

VSS

Timer X

interrupt

Timer X

interrupt

Timer X

interrupt

Timer X

interrupt

Timer X

interrupt

Timer X

interrupt

Modulation of volume

(amplitude is set

by D-A1 output)

Modulation of pitch interval: 440 Hz

(Cycle is set by timer X)

3886 Datasheet(PDF) 241 Page - Renesas Technology Corp

3886 Datasheet(HTML) 241 Page - Renesas Technology Corp

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