FM radio circuit for MTS The TDA7021 is a monolithic integrated circuit designed for FM radio applications, particularly in the VHF range. Here are the factual details about its manufacturer, specifications, descriptions, and features:
### **Manufacturer:**
- The TDA7021 was originally manufactured by **Philips Semiconductors** (now **NXP Semiconductors**).
### **Specifications:**
- **Frequency Range:** 1.5 MHz to 110 MHz (typically used in the FM broadcast band of 88–108 MHz).
- **Supply Voltage:** 1.8V to 6V (operates on low voltage).
- **Current Consumption:** ~3 mA (low power consumption).
- **Intermediate Frequency (IF):** 76 kHz (unconventional low IF design).
- **Sensitivity:** ~3 µV (for 26 dB S/N ratio).
- **Audio Output:** Directly drives headphones (no external amplifier needed for low-impedance headphones).
### **Descriptions:**
- The TDA7021 is a **single-chip FM receiver** IC with a **non-conventional IF system** (76 kHz) that eliminates the need for an external IF filter.
- It uses **frequency-locked loop (FLL)** technology for demodulation instead of a traditional phase-locked loop (PLL).
- Designed for **simple, low-cost FM radio applications**, such as portable radios and toys.
### **Features:**
- **Integrated RF amplifier, mixer, oscillator, IF limiter, and demodulator.**
- **No external IF filter required** (due to low IF frequency).
- **Few external components needed** (minimal circuit design).
- **Direct headphone drive capability** (no additional amplifier required for headphones).
- **Wide supply voltage range** (suitable for battery-powered devices).
- **No alignment needed** (simplifies manufacturing).
This information is based solely on the datasheet and technical documentation for the TDA7021 IC.
