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mt8870 ic

Abstract: TCM5089 equivalent
Contextual Info: Cermetek m icroelectronics ^ J CH1807 Low Cost, DTMF Data Access Arrangement Module Technology patent pending. INTRODUCTION FEATURES The Cermetek CH1807 is a very low cost Data Access Arrange­ ment DAA which connects a Dual Tone Multi Frequency (DTMF) transceiver directly to a Public Switched Telephone