Overview
The SA614AD/01,118, produced by NXP USA Inc., is an improved monolithic low-power FM IF (Intermediate Frequency) system. This integrated circuit is designed to enhance the performance of FM receivers by incorporating several key components into a single package. It includes two limiting intermediate frequency amplifiers, a quadrature detector, muting circuitry, a logarithmic received signal strength indicator (RSSI), and a voltage regulator. This integration reduces the external component count and enhances overall system efficiency.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | SO (Surface-Mounted Miniature) - 16 pins |
| Power Consumption | Typical 3.3 mA |
| IF Bandwidth | 25 MHz |
| Temperature Compensated RSSI | 90 dB dynamic range |
| Audio Outputs | Two - muted and unmuted |
| Sensitivity | 1.5 μV across input pins (0.22 μV into 50 Ω matching network) for 12 dB SINAD |
| IF Frequency | 455 kHz |
| Data Rate | Up to 1.5 Mbps |
| Input Impedance (IF) | 1.4 - 1.6 kΩ |
| Output Impedance (IF) | 0.85 - 1.0 kΩ |
| Limiter Input Impedance | 1.4 - 1.6 kΩ |
| Output Resistance (Unmuted Audio) | 58 kΩ |
| Output Resistance (Muted Audio) | 58 kΩ |
Key Features
- Low power consumption: Typical 3.3 mA, making it suitable for battery-powered devices.
- Temperature compensated logarithmic RSSI with a 90 dB dynamic range, ensuring stable signal strength indication across various temperatures.
- Two audio outputs - muted and unmuted, providing flexibility in audio signal handling.
- Low external component count, suitable for crystal/ceramic filters, simplifying the overall circuit design.
- Excellent sensitivity: 1.5 μV across input pins for 12 dB SINAD, enhancing the receiver's ability to detect weak signals.
- High IF bandwidth (25 MHz) and wide IF bandwidth capability, supporting high data rates up to 1.5 Mbps.
Applications
The SA614AD/01,118 is primarily used in FM receiver systems, including but not limited to:
- Portable radios and walkie-talkies.
- Wireless communication devices requiring FM IF processing.
- Automotive and marine radio systems.
- Industrial and commercial communication equipment.
Q & A
- What is the typical power consumption of the SA614AD/01,118?
The typical power consumption is 3.3 mA. - What is the IF bandwidth of the SA614AD/01,118?
The IF bandwidth is 25 MHz. - What type of package does the SA614AD/01,118 come in?
The SA614AD/01,118 comes in a SO (Surface-Mounted Miniature) package with 16 pins. - What is the dynamic range of the RSSI in the SA614AD/01,118?
The RSSI has a dynamic range of 90 dB. - How many audio outputs does the SA614AD/01,118 provide?
The SA614AD/01,118 provides two audio outputs - muted and unmuted. - What is the sensitivity of the SA614AD/01,118 for 12 dB SINAD?
The sensitivity is 1.5 μV across input pins (0.22 μV into 50 Ω matching network). - What is the maximum data rate supported by the SA614AD/01,118?
The maximum data rate supported is up to 1.5 Mbps. - What is the input impedance of the IF stage in the SA614AD/01,118?
The input impedance of the IF stage is 1.4 - 1.6 kΩ. - What are the primary applications of the SA614AD/01,118?
The primary applications include FM receiver systems, portable radios, walkie-talkies, automotive and marine radio systems, and industrial communication equipment. - Does the SA614AD/01,118 require external components for RSSI linearity?
Yes, to achieve optimum RSSI linearity, additional components such as a 12 dB insertion loss between the first and second limiting amplifiers may be required.
