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.
