Overview
The AD603, with the part number 5962-9457203MPA, is a low noise, voltage-controlled amplifier produced by Analog Devices Inc. This component is designed for use in RF and IF AGC (Automatic Gain Control) systems. It offers accurate, pin-selectable gains and is known for its superior noise performance and wide bandwidth capabilities.
The AD603 is part of Analog Devices' portfolio of variable gain amplifiers, leveraging the proprietary X-AMP® technology. This technology ensures a linear-in-dB gain control, making it highly suitable for applications requiring precise gain adjustments.
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
- Linear-in-dB gain control with pin-programmable gain ranges from -11 dB to +31 dB with a 90 MHz bandwidth, or +9 dB to +51 dB with a 9 MHz bandwidth.
- Any intermediate gain range can be arranged using one external resistor.
- Low input noise spectral density of 1.3 nV/√Hz.
- High impedance (50 MΩ), low bias (200 nA) differential input.
- Gain control voltage scaling of 25 mV/dB, requiring only 1 V to span the central 40 dB of the gain range.
- Overrange and underrange of 1 dB provided whatever the selected range.
- Gain control response time less than 1 μs for a 40 dB change.
- Differential gain control interface allows the use of either differential or single-ended positive or negative control voltages.
- Can drive a load impedance as low as 100 Ω with low distortion.
- Uses the patented X-AMP® technology, comprising a variable attenuator followed by a fixed-gain amplifier.
Applications
- RF/IF AGC amplifiers.
- Video gain controls.
- A/D range extensions.
- Signal measurements.
Q & A
- What is the AD603 used for?
The AD603 is used in RF and IF AGC systems, providing accurate and linear-in-dB gain control.
- What are the gain ranges of the AD603?
The AD603 offers gain ranges from -11 dB to +31 dB with a 90 MHz bandwidth, or +9 dB to +51 dB with a 9 MHz bandwidth. Intermediate ranges can be set using an external resistor.
- What is the input noise spectral density of the AD603?
The input noise spectral density is 1.3 nV/√Hz.
- How is the gain controlled in the AD603?
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 power consumption of the AD603?
The power consumption is 125 mW at the recommended ±5 V supplies.
- What is the operating temperature range of the AD603?
The operating temperature range is from -40°C to +85°C.
- Can the AD603 drive low impedance loads?
Yes, the AD603 can drive a load impedance as low as 100 Ω with low distortion.
- What technology does the AD603 use?
The AD603 uses the patented X-AMP® technology, which includes a variable attenuator followed by a fixed-gain amplifier.
- What are some common applications of the AD603?
Common applications include RF/IF AGC amplifiers, video gain controls, A/D range extensions, and signal measurements.
- How fast is the gain control response time of the AD603?
The gain control response time is less than 1 μs for a 40 dB change.
