Overview
The AD603ARZ is a low noise, voltage-controlled amplifier designed by Analog Devices Inc. for use in RF and IF AGC (Automatic Gain Control) systems. It features a unique proprietary circuit topology known as the X-AMP®, which includes a variable attenuator followed by a fixed-gain amplifier. This design allows the amplifier to maintain high performance and low distortion across a wide range of gain settings. The AD603ARZ is available in an 8-Lead SOIC package and is specified for operation from −40°C to +85°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Resistance (Pin 3 to Pin 4) | 97 | 100 | 103 | Ω |
| Input Capacitance | 2 | pF | ||
| Input Noise Spectral Density | 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 | ||
| Gain Range | −11 dB to +31 dB | |||
| Gain Control Response Time (40 dB change) | < 1 μs |
Key Features
- Linear-in-dB gain control with pin-programmable gain ranges from −11 dB to +31 dB and bandwidths of up to 90 MHz.
- Low input noise spectral density of 1.3 nV/√Hz and low total harmonic distortion (typically −60 dBc for a ±1 V sinusoidal output at 10 MHz).
- High impedance (50 MΩ) and low bias (200 nA) differential gain control interface, allowing for either differential or single-ended positive or negative control voltages.
- Ability to drive load impedances as low as 100 Ω with minimal distortion.
- Peak specified output of ±2.5 V minimum into a 500 Ω load.
- Operational temperature range from −40°C to +85°C.
Applications
- RF and IF AGC (Automatic Gain Control) systems.
- Video gain controls.
- A/D range extensions.
- Signal measurements.
Q & A
- What is the AD603ARZ used for? The AD603ARZ is used in RF and IF AGC systems, video gain controls, A/D range extensions, and signal measurements.
- What is the gain range of the AD603ARZ? The gain range is from −11 dB to +31 dB with a bandwidth of 90 MHz, or +9 dB to 51+ dB with a bandwidth of 9 MHz.
- What is the input noise spectral density of the AD603ARZ? The input noise spectral density is 1.3 nV/√Hz.
- How much power does the AD603ARZ consume? The power consumption is 125 mW at the recommended ±5 V supplies.
- What is the minimum load impedance the AD603ARZ can drive? The AD603ARZ can drive a load impedance as low as 100 Ω with low distortion.
- What is the peak specified output of the AD603ARZ? The peak specified output is ±2.5 V minimum into a 500 Ω load.
- What is the operational temperature range of the AD603ARZ? The operational temperature range is from −40°C to +85°C.
- What package types are available for the AD603ARZ? The AD603ARZ is available in an 8-Lead SOIC package.
- How does the gain control interface work? The gain control interface is a high impedance (50 MΩ) and low bias (200 nA) differential input, allowing for either differential or single-ended positive or negative control voltages.
- Can multiple AD603ARZ amplifiers be cascaded? Yes, several AD603ARZ amplifiers can be cascaded and their gain control gains offset to optimize the system SNR).
