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LM4880-D08-T Datasheet(PDF) 4 Page - Unisonic Technologies |
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LM4880-D08-T Datasheet(HTML) 4 Page - Unisonic Technologies |
4 / 11 page LM4880 CMOS IC UNISONICTECHNOLOGIESCO.,LTD 4 of 11 www.unisonic.com.tw QW-R502-033,B TYPICAL APPLICATION + + 1 7 OUT A OUT B Shutdown Bypass IN B 6 3 5 2 + + - + - Bias + IN A GND + 4 8 20k Ri Audio Input Audio Input 20kΩ Ri VDD/2 50kΩ 0.1μF CS 20kΩ R F + VDD *Co 8Ω or R L Ω 32 50kΩ *Co 32 Ω CB 1.0 F μ *Ci *Ci 20kΩ RF 8Ω or RL Ω Figure 1.Typical Audio Amplifier Application Circuit 15kΩ 15kΩ EXTERNAL COMPONENTS DESCRIPTION (Figure 1) COMPONENTS FUNCTIONAL DESCRIPTION 1. Ri Inverting input resistance which sets the closed-loop gain in conjunction with RF. This resistor also forms a high pass filter with Ci at fc = 1/(2πRiCi). 2. Ci Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a high pass filter with Ri at fc = 1/(2πRiCi). 3. RF Feedback resistance which sets closed-loop gain in conjunction with Ri. 4. Cs Supply bypass capacitor which provides power supply filtering. 5. CB Bypass pin capacitor which provides half-supply filtering. 6. CO Output coupling capacitor which blocks the DC voltage at the amplifier’s output. Forms a high pass filter with RL at fo = 1/(2πRLCo). |
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