Motorola 8900 User Manual - Page 52
Differential Speaker Circuit, Audio Interface, C24 Module Hardware Description
UPC - 845374028836
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Audio Interface It is designed as a differential output with 32Ω impedance, but may also be used as a single-ended output referenced to the C24 analog ground. The speaker output is used for both the handset and the headset audio paths. Figure 2-17 shows a differential speaker circuit, Figure 2-18 shows a single-ended speaker circuit and Table 2-8 gives the speaker specifications. Figure 2-17: Differential Speaker Circuit Important: For safety regulations it is important to place series resistors on the speaker output lines, as illustrated in Figure 2-17. The resistors value should be R = 0Ω at the design stage, but may be changed to a different value during audio safety testing, in case speaker level limitation is required. Figure 2-18: Single-ended Speaker Circuit 28 C24 Module Hardware Description December 15, 2008