поискавой системы для электроныых деталей |
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TEA7063FP датащи(PDF) 9 Page - STMicroelectronics |
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TEA7063FP датащи(HTML) 9 Page - STMicroelectronics |
9 / 15 page In this condition an internal connection is acti- vated from line DTMF output (pin 16) to Receive Output (pin 20) with an attenuation GRS = 38.5dB to provide acoustic feedback of the DTMF emis- sion. 4. A.G.C AND SIDETONE PROGRAMMING 4.1 Programmable Controls AGC and sidetone attack and disonnect points (or currents) are programmable externally through two independents pins, I-start (pin 9) and I-slope (pin 15). 4.2 I-Start (pin 9) An external resistor RLL connected between I- start (pin 9) and Microprocessor Supply (pin 19) controls the attack point of AGC and ZAL (an- tisidetone Z). ILL is the line current at which the control starts. Formulas for ILL and RLL with R9 = 100K are: ILL = 2880 RLL + 11mA RLL = 2880 ( ILL − 11mA ) 4.3 I-Slope (pin 15) An external resistor RLS connected between I-slope (pin 15) and Microprocessor Supply (pin 19) controls the disconnected point of AGC and ZAS (antisidetone Z). ILS is the line current at which the control stops. Formulas for ILS and RLS with R9 = 100K are: ILS = 4680 RLS + ILL; RLS = 4680 ( ILS − ILL ) 4.4 A.G.C. OFF (pin 9 and 15) Programming ILL and ILS respectively higher than 70mA and 450mA is forcing the IC in AGC OFF Condition. Suggested external components are: RLL = 51K Ω and RLS = 10KΩ In this case sending, receiving gain and sidetone compensation are independent of the line lenght. Pins 1 and 2 can be connected to each other sav- ing 5 passive external components at pin 2. 4.5 Secret Function for Private (pin 14) The two separate thresholds for sending and Re- ceiving Mute (pin 14) allow ”Secret Function” (only microphone muted). Pin 14 can be set: a) between 0.25V and 0.8V for speech mode, b) between 1.6V and 2.1V for ”secret” mode (mi- crophone muted), c) between 2.7V and 3.3V for ”all muted” mode Figure 7 TEA7063 9/15 |
Аналогичный номер детали - TEA7063FP |
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Аналогичное описание - TEA7063FP |
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