LS656B 查看數據表（PDF） - STMicroelectronics

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LS656B

TONE GENERATOR INTERFACE TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY

STMicroelectronics 

LS656

Figure 12 : Sending and Receiving Gain vs. Line Current (application circuit of fig. 10).

Figure 13 : Application Circuit without Multifrequency.

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