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ENA0654 Datasheet(PDF) 11 Page - Sanyo Semicon Device |
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ENA0654 Datasheet(HTML) 11 Page - Sanyo Semicon Device |
11 / 12 page LA75520KVA No.A0654-11/12 Continued from preceding page. Pin No. Pin name Function Equivalent Circuit 16 IF AGC IF AGC filter connection pin. The signal peak-detected by the built-in AGC detector is converted to the AGC voltage at pin 16. Additionally, a second AGC filter (a lag-lead filter) used to create the dual time constants is provided internally in the IC. Use a 0.022 μF capacitor as the external capacitor (C1), and adjust the value according to the sag, AGC speed, and other characteristics. 16 5k Ω 1k Ω 1k Ω C1 17 18 VIF IN2 VIF IN1 VIF amplifier input pin The input circuit is a balanced circuit, and the input impedance is as follows: R ≈ 1.0kΩ 18 17 19 GND 20 RF AGC VR RF AGC volume connection pin This pin sets the tuner RF AGC operating point. Also, the FM output and the video output can both be muted at the same time by connecting this pin to ground. 20 21 SIF CARRIER OUT First SIF output pin This is an emitter-follower output with a 200 Ω resistor attached in series. 21 200 Ω 22 AUDIO BIAS FILTER Connection pin for a filter used to hold the FM detector output DC voltage fixed. Normally, a 1 μF electrolytic capacitor should be used. The capacitance (CI) should be increased if the low band (around 50Hz) frequency characteristics need to be improved. 22 300 Ω 300 Ω 40kΩ 40k Ω C1 + Continued on next page. |
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