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MC13142D Folha de dados(PDF) 3 Page - Motorola, Inc |
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MC13142D Folha de dados(HTML) 3 Page - Motorola, Inc |
3 / 16 page MC13142 3 MOTOROLA RF/IF DEVICE DATA CIRCUIT DESCRIPTION General The MC13142 is a low power LNA, double–balanced Mixer, and VCO. This device is designated for use as the frontend section in analog and digital FM systems such as Digital European Cordless Telephone (DECT), PHS, PCS, Cellular, UHF and 800 MHz Special Mobile Radio (SMR), UHF Family Radio Services and 902 to 928 MHz cordless telephones. It features a mixer linearity control to preset or auto program the mixer dynamic range, an enable function and a wideband IF so the IC may be used either as a down converter or an up converter. Further details are covered in the Pin by Pin Description which shows the equivalent internal circuit and external circuit requirements. Current Regulation/Enable Temperature compensating voltage independent current regulators are controlled by the enable function in which “high” powers up the IC. Low Noise Amplifier (LNA) The LNA is internally biased at low supply current (approximately 2.0 mA emitter current) for optimal noise figure and gain. The LNA output is biased internally with a 600 Ω resistor to VCC. Input and output matching may be achieved at various frequencies using few external components. Matching the LNA for Maximum stable gain (MSG) yields noise performance within a few tenths of a dB of the minimum noise figure. Mixer The mixer is a double–balanced four quadrant multiplier biased class AB allowing for programmable linearity control via an external current source. An input third order intercept point of 20 dBm may be achieved. All 3 ports of the mixer are designed to work up to 1.8 GHz. The mixer has a 50 Ω single–ended RF input and open collector differential IF outputs. An on–board Local Oscillator transistor has the emitter, base and collector pinned out to implement a low phase noise VCO in various configurations. Additionally, a buffered LO output is provided for operation with a frequency synthesizer. The linear gain of the mixer is approximately 0 dB with a SSB noise figure of 12 dB in the IF output circuit configuration shown in the application example. Local Oscillator The on–chip transistor operates with coaxial transmission line or LC resonant elements to over 2.0 GHz. Biasing is done with a temperature compensated current source in the emitter and a collector to base internal resistor of 7.6 k Ω; however, an RFC from VCC to base is recommended. The application circuit shows a voltage controlled Clapp oscillator operating at center frequency of 975 MHz. |
Nº de peça semelhante - MC13142D |
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Descrição semelhante - MC13142D |
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