Overview
The AD602JR, produced by Analog Devices Inc., is a dual-channel, low noise, wideband variable gain amplifier. This component is optimized for applications requiring precise gain, low noise, and wide bandwidth, particularly in ultrasound imaging systems, but it is also suitable for other high-performance applications such as audio and RF AGC systems.
The AD602JR features a gain range of –10 dB to +30 dB, with an input noise spectral density of 1.4 nV/√Hz. The gain is directly proportional to the control voltage and is accurately calibrated and stable over supply and temperature variations. The amplifier uses a proprietary X-AMP® circuit to achieve its performance objectives.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Gain Range | -10 dB | - | +30 dB | dB |
| Input Noise Spectral Density | 1.4 | 1.4 | 1.4 | nV/√Hz |
| Bandwidth (-3 dB) | - | 35 MHz | - | MHz |
| Signal-to-Noise Ratio (SNR) at 1 V rms output and 1 MHz noise bandwidth | - | 86 dB | - | dB |
| Input Resistance | 95 | 100 | 105 | Ω |
| Quiescent Current per Channel | 11 | 12.5 | 14 | mA |
| Operating Temperature Range (J Grade) | 0°C | - | 70°C | °C |
| Supply Voltage Range | ±4.75 V | - | ±5.25 V | V |
Key Features
- Dual-channel, low noise, wideband variable gain amplifier with a gain range of –10 dB to +30 dB.
- Low input noise spectral density of 1.4 nV/√Hz.
- High bandwidth of dc to 35 MHz (-3 dB), essentially independent of the gain.
- Accurate and stable gain control, with the gain directly proportional to the control voltage.
- Signal gating function for each amplifier, allowing for the blocking of signal transmission and setting the dc output level to within a few millivolts of the output ground.
- TTL- and CMOS-compatible gating control input.
- Low distortion: -60 dBc THD at ±1 V output.
- Ability to drive 100 Ω load impedances with low distortion.
- MIL-STD-883-compliant and DESC versions available.
Applications
- Ultrasound imaging systems and sonar time-gain controls.
- High-performance audio systems.
- RF AGC (Automatic Gain Control) systems.
- Signal measurement and processing.
Q & A
- What is the gain range of the AD602JR?
The gain range of the AD602JR is –10 dB to +30 dB.
- What is the input noise spectral density of the AD602JR?
The input noise spectral density is 1.4 nV/√Hz.
- What is the bandwidth of the AD602JR?
The bandwidth is dc to 35 MHz (-3 dB).
- Is the gain control of the AD602JR stable over temperature and supply variations?
- What is the signal-to-noise ratio (SNR) of the AD602JR?
The SNR for a 1 V rms output and a 1 MHz noise bandwidth is typically 86 dB.
- Can the AD602JR drive high load impedances?
- Is the AD602JR compatible with TTL and CMOS logic?
- What are the operating temperature ranges for the AD602JR?
The operating temperature range for the J Grade is 0°C to 70°C, and for the A Grade, it is –40°C to +85°C. The S Grade operates from –55°C to +125°C.
- What are some common applications of the AD602JR?
- Is the AD602JR MIL-STD-883 compliant?
