Overview
The AD603AR-REEL, produced by Analog Devices Inc., is a low noise, voltage-controlled amplifier designed for use in RF and IF AGC (Automatic Gain Control) systems. This amplifier is part of the AD603 series and is known for its high accuracy and stability over a wide range of temperatures and supply voltages. It features a patented X-AMP® topology, which includes a variable attenuator followed by a fixed-gain amplifier, allowing for continuous gain control that is linear in dB. The AD603AR-REEL is packaged in an 8-Lead SOIC (Small Outline Integrated Circuit) and is available on a 13-inch tape and reel, making it suitable for high-volume production and automated assembly processes.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Resistance | Pin 3 to Pin 4 | 97 | 100 | 103 | Ω |
| Input Capacitance | 2 | pF | |||
| Input Noise Spectral Density | Input short-circuited | 1.3 | nV/√Hz | ||
| Noise Figure | f = 10 MHz, gain = maximum, RS = 10 Ω | 8.8 | dB | ||
| 1 dB Compression Point | f = 10 MHz, gain = maximum, RS = 10 Ω | -11 | dBm | ||
| Peak Input Voltage | ±1.4 | ±2 | V | ||
| -3 dB Bandwidth | VOUT = 100 mV rms | 90 | MHz | ||
| Power Consumption | VS = ±5 V | 125 | mW | ||
| Operating Temperature Range | -40 | +85 | °C |
Key Features
- Low Noise: Input noise spectral density of 1.3 nV/√Hz, making it suitable for high-sensitivity applications.
- Voltage-Controlled Gain: Provides accurate, pin-selectable gains of −11 dB to +31 dB with a bandwidth of 90 MHz or +9 dB to 51+ dB with a bandwidth of 9 MHz.
- High Impedance Gain Control: Differential input with high impedance (50 MΩ) and low bias (200 nA), allowing for precise gain control.
- Fast Gain Control Response: Response time of less than 1 μs for a 40 dB change.
- Low Distortion: Can drive a load impedance as low as 100 Ω with low distortion; total harmonic distortion of −60 dBc for a ±1 V sinusoidal output at 10 MHz.
- Patented X-AMP Topology: Includes a variable attenuator followed by a fixed-gain amplifier, ensuring continuous gain control that is linear in dB.
- Robust Operating Range: Specified for operation from −40°C to +85°C.
Applications
- RF/IF AGC Amplifiers: Ideal for automatic gain control in radio frequency and intermediate frequency systems.
- Video Gain Controls: Suitable for video signal processing where precise gain control is necessary.
- A/D Range Extensions: Can be used to extend the dynamic range of analog-to-digital converters.
- Signal Measurements: Useful in various signal measurement applications requiring high accuracy and low noise.
Q & A
- What is the input noise spectral density of the AD603AR-REEL?
The input noise spectral density is 1.3 nV/√Hz.
- What is the gain range of the AD603AR-REEL?
The gain range is −11 dB to +31 dB with a bandwidth of 90 MHz or +9 dB to 51+ dB with a bandwidth of 9 MHz.
- How is the gain controlled in the AD603AR-REEL?
The gain is controlled through a high impedance (50 MΩ), low bias (200 nA) differential input, with a scaling of 25 mV/dB.
- What is the response time for a 40 dB gain change in the AD603AR-REEL?
The response time is less than 1 μs for a 40 dB change.
- What is the minimum load impedance that the AD603AR-REEL can drive?
The AD603AR-REEL can drive a load impedance as low as 100 Ω with low distortion.
- What is the total harmonic distortion for a ±1 V sinusoidal output at 10 MHz?
The total harmonic distortion is typically −60 dBc for a ±1 V sinusoidal output at 10 MHz.
- What is the peak specified output voltage of the AD603AR-REEL?
The peak specified output voltage is ±2.5 V minimum into a 500 Ω load.
- What is the operating temperature range of the AD603AR-REEL?
The operating temperature range is from −40°C to +85°C.
- Can multiple AD603AR-REEL amplifiers be cascaded?
Yes, several of these amplifiers may be cascaded and their gain control gains offset to optimize the system SNR.
- What is the power consumption of the AD603AR-REEL at the recommended ±5 V supplies?
The power consumption is 125 mW at the recommended ±5 V supplies.
