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1. Description
MC1350 is an integrated circuit with a wide range of AGC, which can be used as an IF amplifier in radios and TVs in the operating temperature range of 0° to +75°C. The input amplifiers (Q1 and Q2) operate at constantemitter currents so that input impedance remainsindependent of AGC action. Input signals may be appliedsingle–ended or differentially (for ac) with identical results.Terminals 4 and 6 may be driven from a transformer, but a dcpath from either terminal to ground is not permitted AGC action occurs as a result of an increasing voltage onthe base of Q4 and Q5 causing these transistors to conductmore heavily thereby shunting signal current from theinterstage amplifiers Q3 and Q6. The output amplifiers aresupplied from an active current source to maintain constantquiescent bias thereby holding output admittance nearlyconstant. Collector voltage for the output amplifier must besupplied through a center–tapped tuning coil to Pins 1 and 8.The 12 V supply (V+) at Pin 2 may be used for this purpose,but output admittance remains more nearly constant if aseparate 15 V supply (V++) is used, because the basevoltage on the output amplifier varies with AGC bias.
2. Feature
1. Power Gain: 50 dB Typ at 45 MHZ
50 dB Typ at 58 MHZ
2. AGC Range: 60 dB Min, DC to 45 MHz
3. Nearly Constant Input & Output Admittance over the Entire AGC Range
4. Y21 Constant ( –3.0 dB) to 90 MHz
5. Low Reverse Transfer Admittance: < < 1.0 μmho Typ
6. 12 V Operation, Single–Polarity Power Supply
3. ELECTRICAL CHARACTERISTICS
4. Packaging Information
