Overview
The AD8309ARU, produced by Analog Devices Inc., is a complete Intermediate Frequency (IF) limiting amplifier. It provides an accurate logarithmic (decibel) measure of the input signal, known as the Received Signal Strength Indication (RSSI) function, over a dynamic range of 100 dB. The device also features a programmable limiter output, making it versatile for various applications. It operates with a single supply voltage of +2.7 V to +6.5 V and consumes less than 50 mW of power at 3 V. The AD8309ARU is designed for high-performance receivers and signal processing applications, offering low noise and high gain characteristics.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Supply Voltage | 2.7 | - | 6.5 | V |
| Supply Current | - | 16 | - | mA |
| Input Resistance | 800 | 1000 | 1200 | Ω |
| Input Capacitance | - | 2.5 | - | pF |
| Dynamic Range | -91 | - | +9 | dBV |
| Usable Frequency Range | 5 | - | 500 | MHz |
| Power Dissipation | - | - | 800 | mW |
| Operating Temperature | -40 | - | +85 | °C |
| Package Type | - | - | - | TSSOP-16 |
Key Features
- Accurate Logarithmic Measurement: Provides an accurate RSSI function over a dynamic range of 100 dB.
- Programmable Limiter Output: Useful from 5 MHz to 500 MHz, with a total gain of up to 72 dB plus an additional 18 dB from the output stage.
- Low Power Consumption: Operates with a single supply voltage of +2.7 V to +6.5 V, consuming less than 50 mW at 3 V.
- Fast Power-Up and Shutdown: CMOS-compatible control interface enables the device within 500 ns and disables it to a standby current of under 1 µA.
- High Input Impedance: Fully differential inputs with a moderately high impedance (1 kΩ in parallel with 2.5 pF).
- Low Noise: Input-referred noise-spectral-density of 1.28 nV/√Hz when driven from a terminated 50 Ω source.
Applications
- Receivers for Frequency and Phase Modulation: Ideal for high-performance receivers requiring accurate signal strength indication and frequency/phase information recovery.
- Wide Range IF and RF Power Measurement: Suitable for measuring signal strength across a broad frequency range.
- Low Cost Radar and Sonar Signal Processing: Used in cost-effective radar and sonar systems for signal processing.
- Instrumentation: Applicable in network and spectrum analyzers for precise signal measurement.
Q & A
- What is the primary function of the AD8309ARU?
The AD8309ARU is a complete IF limiting amplifier that provides an accurate logarithmic (decibel) measure of the input signal and a programmable limiter output.
- What is the dynamic range of the AD8309ARU?
The dynamic range of the AD8309ARU extends from –91 dBV to +9 dBV.
- What is the usable frequency range of the AD8309ARU?
The usable frequency range is from 5 MHz to 500 MHz.
- What is the power consumption of the AD8309ARU?
The device consumes less than 50 mW of power at 3 V.
- How quickly can the AD8309ARU be powered up and shut down?
The device can be enabled within about 500 ns and disabled to a standby current of under 1 µA.
- What is the input impedance of the AD8309ARU?
The input impedance is 1 kΩ in parallel with 2.5 pF.
- What is the noise figure of the AD8309ARU?
The input-referred noise-spectral-density is 1.28 nV/√Hz, equivalent to a noise figure of 3 dB.
- In what package is the AD8309ARU available?
The device is available in a 16-lead TSSOP package.
- What are the operating temperature ranges for the AD8309ARU?
The operating temperature range is from –40°C to +85°C.
- What are some typical applications of the AD8309ARU?
Typical applications include receivers for frequency and phase modulation, wide range IF and RF power measurement, low-cost radar and sonar signal processing, and instrumentation such as network and spectrum analyzers.
