|Datasheet||Download MC13176D datasheet
The MC13175 and MC13176 are one chip FM/AM transmitter subsystems designed for AM/FM communication systems. They include a Colpitts crystal reference oscillator, UHF oscillator, 32 (MC13176) prescaler and phase detector forming a versatile PLL system. Targeted applications are in the to 470 MHz band and to 928 MHz band covered by FCC Title 47; Part 15. Other applications include local oscillator sources in UHF and 900 MHz receivers, UHF and 900 MHz video transmitters, RF Local Area Networks (LANs), and high frequency clock drivers. The MC13175/76 offer the following features: UHF Current Controlled Oscillator
Uses Easily Available 3rd Overtone or Fundamental Crystals for Reference Fewer External Parts Required Low Operating Supply Voltage to 5.0 Vdc) Low Supply Drain Currents Power Output Adjustable (Up to +10 dBm) Differential Output for Loop Antenna or Balun Transformer Networks Power Down Feature ASK Modulated by Switching Output On and Off 8 x fref; 32 x fref
50 coaxial balun, 1/10 wavelength at 320 MHz equals 1.5 inches. Pins are ground and connected to VEE which is the component/DC ground plane side of PCB. These pins must be decoupled to VCC; decoupling capacitors should be placed as close as possible to the pins. The crystal oscillator circuit may be adjusted for frequency with the variable inductor (MC13175); recommended source is Coilcraft "slot seven" 7mm tuneable inductor, Part #7M3821. 1.0k resistor. Shunting the crystal prevents it from oscillating in the fundamental mode.
Rating Power Supply Voltage Operating Supply Voltage Range Junction Temperature Operating Ambient Temperature Storage Temperature Symbol VCC TJ TA Tstg Value 7.0 (max) to +150 Unit Vdc °CELECTRICAL CHARACTERISTICS (Figure 2; VEE 3.0 Vdc, = 25°C, unless otherwise noted.)*
Characteristic Supply Current (Power down: = 0) Supply Current (Enable [Pin 11] to VCC thru = 0) Total Supply Current (Transmit Mode) (Imod = 2.0 mA; = 320 MHz) Differential Output Power (fo = 320 MHz; Vref [Pin = 500 mVpp; N x fref) Imod 2.0 mA (see Figures 7 and 8) Imod 0 mA Holdin Range fref N) MC13175 (see Figure 7) MC13176 (see Figure 8) Phase Detector Output Error Current MC13175 MC13176 Oscillator Enable Time (see Figure 27) Amplitude Modulation Bandwidth (see Figure 29) Spurious Outputs (Imod = 2.0 mA) Spurious Outputs (Imod = 0 mA) Maximum Divider Input Frequency Maximum Output Frequency
NOTES: 1. VCC is ground; while VEE is negative with respect to ground. 2. Pins 5, 10 and 15 are brought to the circuit side of the PCB via plated through holes. They are connected together with a trace on the PCB and each Pin is decoupled to VCC (ground). 3. Recommended source is Coilcraft "slot seven" inductor, part number 7M3821.
Pin 1&4 Symbol Osc 1, Osc 0sc 1 Internal Equivalent Circuit VCC 10k 4 Osc 4 Description/External Circuit Requirements 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 baseemitter capacitances in series configuration form the capacitance for the parallel tank. These are the baseemitters at Pins 1 and 4 and the baseemitter 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.
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.
VEE 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 + 25°C and + 85°C for 320 MHz. The CCO may be FM modulated as shown in Figures 18 and MC13176 320 MHz FM Transmitter. A detailed discussion is found in the Applications Information section.
Phase Detector Output The phase detector provides µA to keep the CCO locked at the desired carrier frequency. The output impedance of the phase detector is approximately 53 k. Under closed loop conditions there 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.
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