参数资料
型号: 20-151-0178
厂商: Rabbit Semiconductor
文件页数: 57/162页
文件大小: 0K
描述: CABLE CONVERTER RS-232 TO USB
标准包装: 1
附件类型: USB 至 RS232 适配器
适用于相关产品: 基于 Rabbit 的板
产品目录页面: 619 (CN2011-ZH PDF)
其它名称: 20-151-0178-ND
316-1181
4.3.12.3 Speaker
DAC channel #0 can be configured as an input to a speaker. A pulse width modulated (PWM) signal goes
through a low-pass filter, changing the high speed digital signal from the Rabbit processor into a smoothly
varying analog signal. This signal is not strong enough to drive the speaker, so it goes through a low volt-
age audio power amplifier before connecting to the speaker line. Figure 4-23 is a circuit schematic of the
filter/amplifier. The output to the speaker is on J6.
Figure 4-23 Loudspeaker Circuit Schematic
+5 V
DAC 0-3 V
Analog Output
R13
100 k W
C7
100 nF
U6
LM386
C9
330 μF
Speaker
R14
4.7 k W
C8
100 nF
R15
10 W
VERSION 5.03
Speaker
Figure 4-24 Speaker Characteristics
NOTE: The operating temperature range for the speaker differs from the operating tempera-
ture range (–40°C to +70°C) of the rest of the RabbitFLEX BL300F components.
A sample WAV files is provided in /Samples/RabbitFlex_BL300F/audio/ or in
/Samples/RabbitFlex_SBC40/audio/ depending on your version of Dynamic C.
RabbitFLEX User’s Manual
51
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