ULN2204A-2B AM/FM Radio System IC PDIP-16

Description

ULN2204A-2B AM/FM Radio System IC PDIP-16 Providing all radio functions except VHF tuning, the ULN2204A AM/FM radio system excels in low-cost applications requiring a minimal parts count and high performance. In the AM mode of operation, the device is a complete single conversion superheterodyne broadcast or shortwave receiver with AGC and peak envelope detection. In the FM mode, the ULN2204A operates as a high-gain IF amplifier/limiter and phase-shift detector. A simple dc switch is used to change the mode of operation. A single external capacitor at pin 16 provides the AM-AGC time constant, the FM-AFC time constant, and RF decoupling. A single resistor al the same pin will adjust the AM gain for optimal system performance. The audio amplifier will work into any speaker load of 8Ω or greater. Class-B operation of the audio power amplifier yields high efficiency at the rated output with a very low quiescent power drain. The amplifier exhibits little crossover distortion. Its output impedance is significantly less than 1Ω. The ULN2204A will work with a wide range of supply voltages and is suitable for use in AC-powered table radios and battery-powered (6V or 9V) portable radios. This system will operate at supply voltages as low as 2V at reduced volume without a significant increase in distortion. Brown-outs or weak batteries need no longer be a major concern. The ULN2204A is supplied in a 16-pin dual in-line plastic package with a copper lead frame that eliminates many decoupling problems and allows maximum power dissipation. Features Low Harmonic Distortion. Wide Operating Voltage Range. Low Power Drain. DC AM/FM Switching. 30 μV Limiting Threshold. Excellent AM Rejection. Good Usable Sensitivity. Specifications Parameter Value Model ULN2204A-2B AM/FM Radio System IC Package 16‑pin PDIP AM Receiver Single‑conversion superheterodyne FM Receiver IF amplifier/limiter, phase‑shift detector Gain Control External resistor Audio Output Class‑B, drives ≥ 8 Ω speaker loads Output Impedance < 10 Ω Supply Voltage 6 V–9 V (battery) or AC‑powered levels Operating Temperature –20 °C to +70 °C (typical) PINOUT Dimensions Application AM/FM table radios and portable radio receivers. Audio amplification and signal processing modules. Low‑cost, minimal‑parts radio designs. Educational and hobbyist radio kits. Datasheet ULN2204A-2B IC.

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