Download: Audio ICs FM / TV front end BA4424N

Audio ICs FM / TV front end BA4424N The BA4424N is a monolithic IC designed for FM front end use. It consists of an RF amplifier circuit, mixer circuit, local oscillation circuit, IF buffer amplifier, and a variable capacitor-diode for AFC. Features 1) An RF amplifier, mixer, local oscillator, IF buffer am- 7) A resistive load can also be used for the mixer out- plifier, and AFC diode are included on-chip. put. 2) Reception of VHF terrestrial TV channels is possible. 8) Mixer input coupling capacitor included on-chip. 3) Uses a double balance mixer to improve intermo- 9) Includes a feedback ca...
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Audio ICs FM / TV front end BA4424N

The BA4424N is a monolithic IC designed for FM front end use. It consists of an RF amplifier circuit, mixer circuit, local oscillation circuit, IF buffer amplifier, and a variable capacitor-diode for AFC. Features 1) An RF amplifier, mixer, local oscillator, IF buffer am- 7) A resistive load can also be used for the mixer out- plifier, and AFC diode are included on-chip. put. 2) Reception of VHF terrestrial TV channels is possible. 8) Mixer input coupling capacitor included on-chip. 3) Uses a double balance mixer to improve intermo- 9) Includes a feedback capacitor for the local oscilla- dulation characteristics. tion circuit. 4) Includes a clamp diode in the mixer output. 10) Compact 9-pin SIP package. Pins arranged for 5) Local oscillation buffer on-chip for improved re- convenient mounting. sponse to strong input. 6) The output impedance of the IF buffer amplifier is matched with the ceramic filter impedance at 330Ω. Absolute maximum ratings (Ta = 25C) Recommended operating conditions (Ta = 25C), Block diagram Electrical characteristics DC characteristics (unless otherwise noted, Ta = 25C, VCC = 4V, no input) AC characteristics (unless otherwise noted, Ta = 25C and VCC = 4V), Measurement circuit Pin connections 1 FM ANT input pin : Connect to BPF ZIN = 6 IF amplifier output pin : ZOUT = 330Ω 75Ω 7 AFC diode pin : Cathode pin (anode pin 2 RF amplifier bypass pin : Connect to bypass ca- is connected internally pacitor to ground) 3 RF amplifier output load pin : Connect to RF tuning 8 OSC pin : Connect to resonating circuit circuit 4 MIX output pin : IFT or resistor load 9 VCC pin : IC voltage supply pin 5 GND pin : IC ground pin Circuit operation (1) RF amplifier circuit The RF amplifier consists of a common base transistor. A band pass filter (BPF) is used in the ANT circuit, and as the RF amplifier is base-grounded, a BPF with an out- put impedance of 75Ω should be used. If a BPF without DC cutoff is used, a coupling capacitor will be necessary. An LC tuning circuit is connected to form the output load of the RF amplifier. A coil with tap or coil with secondary winding can be used to reduce spurious ratios such as image ratios. A coupling capacitor for the mixer circuit is included on-chip. The bypass capacitor for the RF ampli- fier should have good high frequency characteristics, and it should be connected to the input BPF ground con- nection as close as possible to Pin 5 (GND), such that the connection pattern absolutely does not allow supply cur- rent to flow from Pin 5., (2) Mixer circuit (4) IF buffer amplifier circuit The mixer circuit is a double balance type with minimal The IF buffer amplifier consists of an emitter-follower am- OSC leakage and little spurious interference. The mixer plifier circuit. The output impedance is set in the IC to output includes a diode limiter for improved response to 330Ω, and it can be directly connected to a ceramic filter. strong input signals. (5) Variable capacitor-diode for AFC In addition to an IFT, a resistive load can also be used for A variable capacitor-diode is included in the IC for AFC. the mixer output load. However, take care in this case as Utilize the FM detection output as AFC signal. The anode the gain will fall. is connected to ground. (3) Local oscillation circuit The local oscillation circuit is a Colpitts circuit with grounded collector. The capacitor between the base and emitter and the capacitor between the collector and emit- ter which form the oscillation circuit are included on the IC. A buffer has been added for input to the mixer circuit to protect the circuit when strong input is present. R8 is to prevent spurious radiation. Take care when setting the value., Operation notes (1) Application circuit (4) Mixer load The example application circuit is the one which we rec- In addition to an IFT, a resistive load can also be used for ommend, however, when using it, verify characteristics the mixer output load. However, take care in this case as carefully. the gain and intermodulation characteristics will be af- If external circuit values are changed, set them with suffi- fected. cient margin to allow for deviations of both the Rohm IC and external components in the quiescent and transient (5) Local oscillation circuit characteristics. Also, please note that we have not com- To reduce spurious radiation, the oscillation level at Pin pletely verified any possible patent issues which the ap- 8 (OSC) can be adjusted. This is done by adding a resis- plication circuit may involve. tor (several Ω to several tens of Ω) between Pin 8 and the tank circuit. However, when setting the value, take care (2) Operating power supply voltage range regarding the oscillation margin as related to the tank cir- As long as the operating power supply voltage range is cuit Q damp. not exceeded, the circuit functions are guaranteed within the ambient operating temperature. Although we cannot (6) IF buffer amplifier guarantee that the electrical characteristic values rated If the buffer amplifier pin is connected to another circuit under the rating conditions will be obtained, there will be to use the buffer amplifier pin’s voltage, take care that a no abrupt changes in the characteristics within this reverse voltage never appears at the pin. range. (7) Power supply RC filter (3) RF amplifier Do not insert a resistor between the VCC pin (Pin 9) and A band pass filter (BPF) is used in the ANT circuit, and the MIX OUT pins (Pins 3 and 4), as a resistor inserted as the RF amplifier is base-grounded, a BPF with an out- in the power supply line will decrease sensitivity due to put impedance of 75Ω must be used. If a BPF without DC the drop in the voltage. Regarding the resistor between cutoff is used, a coupling capacitor will be necessary. Pin 9 and the RFout pin (Pin 3), set the value so that the Connect the bypass capacitor to the ground connection voltage at Pin 3 is not lower than the voltage at Pin 2. of the input BPF. The pattern connecting these should be such that supply current will absolutely not flow from Pin 5 (the ground line should be laid in the same fashion as shown in the measurement circuit schematic)., Electrical characteristic curves, External dimensions (Units: mm)]
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