SNC668_05 Datasheet, PDF (8/14 Pages) SONiX Technology Company – 4-Channel Speech Controller

SNC668
4-Channel Speech Controller
5.10 8-bit PWM
A PWM (pulse width modulation) circuit is built-in SNC668. PWM can convert input
digital data into pulse trains with suitable different pulse width. The maximum
resolution of PWM is 8 bits. Two huge output stage circuits are included in SNC668.
Both of them are capable of driving speaker directly. Besides, 15 level PWM output
current is provided for volume adjust function.
#
VOL[3..0] Output Current
(VDD=3V, Vo=1.5V)
0
0000
120mA
1
0001
105mA
2
0010
90mA
3
0011
75mA
4
0100
60mA
5
0101
52.5mA
6
0110
45mA
7
0111
37.5mA
8
1000
30mA
9
1001
22.5mA
A
1010
15mA
B
1011
10.25mA
C
1100
7.5mA
D
1101
3.75mA
E
1110
3.75mA
F
1111
0mA
15 levels PWM output current control
Ver: 1.3
BUO1/VO
BUO2
PWM output
8
June 8, 2005