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ML13150-A9P Datasheet(PDF) 6 Page - LANSDALE Semiconductor Inc. |
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ML13150-A9P Datasheet(HTML) 6 Page - LANSDALE Semiconductor Inc. |
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6 / 20 page  ML13150 LANSDALE Semiconductor, Inc. Fadj CURRENT (µA) Figure 8. IF Amplifier Gain versus IF Frequency f, FREQUENCY (MHz) Figure 9. Fadj Current versus IF Frequency Figure 10. Fadj Voltage versus Fadj Current Figure 11. BWadj Current versus IF Frequency 50 45 35 30 25 20 0.01 0.1 1.0 10 f, IF FREQUENCY (kHz) 120 0 100 80 60 40 20 0 200 400 600 800 1000 VCC = 3.0 Vdc Slope at 455 kHz = 9.26 kHz/ µA 800 750 700 650 600 0 20 40 60 80 100 f, IF FREQUENCY (kHz) VCC = 3.0 Vdc TA = 25°C 3.5 3.0 2.5 2.0 1.5 1.0 0 400 420 440 460 480 500 0.5 40 Vin = 100 µV Rin = 50 Ω Rout = 1.4 kΩ BW (3.0 dB) = 2.4 MHz TA = 25°C VCC = 3.0 Vdc BW 26 kHz/ µA IF AMPLIFIER The first IF amplifier section is composed of three differential stages. This section has internal dc feedback and external input decoupling for improved symmetry and stability. The total gain of the IF amplifier block is approximately 42 dB at 455 kHz. Figure 8 shows the gain of the IF amplifier as a function of the IF frequency. The fixed internal input impedance is 1.5 k Ω; it is designed for applications where a 455 kHz ceramic filter is used and no external output matching is necessary since the filter requires a 1.5 k Ω source and load impedance. Overall RSSI linearity is dependent on having total midband attenuation of 10 dB (4.0 insertion loss plus 6.0 dB impedance matching loss) for the filter. The output of the IF amplifier is buffered and the impedance if 1.5k Ω. LIMITER The limiter section is similar to the IF amplifier section except that six stages are used. The fixed internal input impedance is 1.5 k Ω. The total gain of the limiting amplifier sections is approximately 96 dB. This IF limiting amplifier section internally drives the quadrature detector section. www.lansdale.com Page 6 of 20 Issue A |
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