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ML13176 Folha de dados(PDF) 3 Page - LANSDALE Semiconductor Inc. |
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ML13176 Folha de dados(HTML) 3 Page - LANSDALE Semiconductor Inc. |
3 / 16 page LANSDALE Semiconductor, Inc. ML13175/ML13176 PIN FUNCTION DESCRIPTIONS Pin Symbol Internal Equivalent Circuit Description/External Circuit Requirements 1 & 4 Osc 1, Osc 4 1 0sc 1 10k 4 Osc 4 10k VCC CCO Inputs The oscillator is a current controlled type. An external oscillator coil is connected to Pins 1 and 4 which forms a parallel resonance LC tank circuit with the internal capacitance of the IC and with parasitic capacitance of the PC board. Three base–emitter capacitances in series configuration form the capacitance for the parallel tank. These are the base–emitters at Pins 1 and 4 and the base–emitter of the differential amplifier. The equivalent series capacitance in the differential amplifier is varied by the modulating current from the frequency control circuit (see Pin 6, internal circuit). A more thorough discussion is found in the Applications Information section. 5 VEE VEE VEE VEE 5 Subcon Supply Ground (VEE) In the PCB layout, the ground pins (also applies to Pins 10 and 15) should be connected directly to chassis ground. Decoupling capacitors to VCC should be placed directly at the ground returns. 6 ICont ICont 6 Reg VCC Frequency Control For VCC = 3.0 Vdc, the voltage at Pin 6 is approximately 1.55 Vdc. The oscillator is current controlled by the error current from the phase detector. This current is amplified to drive the current source in the oscillator section which controls the frequency of the oscillator. Figures 9 and 10 show the ∆fosc versus ICont, Figure 5 shows the ∆fosc versus ICont at – 40°C, + 25°C and +85 °C for 320 MHz. The CCO may be FM modulated as shown in Figure 17, ML13176 320 MHz FM Transmitter. A detailed discussion is found in the Applications Information section. 7 PDout 4.0k VCC 4.0k 7 PDout Phase Detector Output The phase detector provides ± 30 µA to keep the CCO locked at the desired carrier frequency. The output impedance of the phase detector is approximately 53 k Ω. Under closed loop conditions there is a DC voltage which is dependent upon the free running oscillator and the reference oscillator frequencies. The circuitry between Pins 7 and 6 should be selected for adequate loop filtering necessary to stabilize and filter the loop response. Low pass filtering between Pin 7 and 6 is needed so that the corner frequency is well below the sum of the divider and the reference oscillator frequencies, but high enough to allow for fast response to keep the loop locked. Refer to the Applications Information section regarding loop filtering and FM modulation. www.lansdale.com Page 3 of 16 Issue Cc |
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