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MC13145FTA Arkusz danych(PDF) 9 Page - LANSDALE Semiconductor Inc. |
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MC13145FTA Arkusz danych(HTML) 9 Page - LANSDALE Semiconductor Inc. |
9 / 17 page www.lansdale.com Page 9 of 17 Issue 0 LANSDALE Semiconductor, Inc. ML13145 Description Description Symbol/Type Pin 32, 34 VEE VCC LO Out+ LO Out– (to Mxr2) VEE, Negative Supply Voltage 33 LO2 LO2 33 VEE 32 390 µA 2nd Local Oscillator The 2nd LO input impedance is broadband 50 Ω; it is driven from an external 50 Ω source. Typical level is –15 to –10 dBm. 35 IF2+ IF2+ 35 VEE 34 2nd Mixer Outputs The Mixer is a differential open collector configuration. 36 IF2– IF2– 36 37 VEE See Figure 4. VEE, Negative Supply Voltage 38 IF In IF Amplifier Input IF amplifier input source impedance is 330 Ω.. The three stage amplifier has 40 dB of gain with 3.0 dB bandwidth of 40 MHz. 39, 40 IF Dec1, IF Dec2 IF Decoupling These pins are decoupled to VCC to provide stable operation of the limiting IF amplifier. 41 IF Out IF Amplifier Output IF amplifier output load impedance is 330 Ω. 42 VCC VCC, Positive Supply Voltage 7 RSSI RSSI The RSSI circuitry in the 2nd & 3rd amplifier stages outputs a current when the output of the previous stage enters limiting. The net result is a RSSI current which represents the logarithm of the IF input voltage. An external resistor to ground is used to provide a voltage output. |
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