Overview
The AD8368ACPZ-REEL7, produced by Analog Devices Inc., is a high-performance variable gain amplifier (VGA) with analog linear-in-dB gain control. This device is designed to operate from low frequencies up to 800 MHz, making it versatile for various RF and microwave applications. The AD8368 features an excellent gain range of −12 dB to +22 dB, scaled accurately to 37.5 dB/V, and a 3 dB bandwidth of 800 MHz that is nominally independent of the gain setting. It is fabricated using Analog Devices' proprietary SiGe SOI complementary bipolar IC process and is available in a 24-lead LFCSP package.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage (VPSO, VPSI) | 4.5 V to 5.5 V |
| Total Supply Current | 60 mA |
| Enable Current (ENBL low) | < 3 mA |
| Gain Range | −12 dB to +22 dB |
| Gain Control Voltage Scaling | 37.5 dB/V |
| 3 dB Bandwidth | 800 MHz |
| Output IP3 at 140 MHz (max gain) | 33 dBm |
| Output Noise Floor | −143 dBm/Hz |
| Noise Figure at max gain | 9.5 dB |
| Input and Output Impedance | Nominally 50 Ω |
| Operating Temperature Range | −40°C to +85°C |
| Package Type | 24-lead LFCSP |
Key Features
- Analog Linear-in-dB Gain Control: The AD8368 offers precise gain control scaled to 37.5 dB/V, making it suitable for applications requiring accurate gain adjustment.
- Automatic Gain Control (AGC): The device can be configured as a complete AGC system using the on-board rms detector, allowing for signal leveling independent of the waveform crest factor.
- Wide Frequency Range: Operates from low frequencies up to 800 MHz, with a 3 dB bandwidth that is nominally independent of the gain setting.
- Low Noise and High Linearity: Features an output IP3 of 33 dBm at 140 MHz and a noise figure of 9.5 dB at maximum gain.
- Power Management: Can be fully powered down to <3 mA by grounding the ENBL pin, and operates from a supply voltage of 4.5 V to 5.5 V.
- Industrial Temperature Range: Operates over the industrial temperature range of −40°C to +85°C.
Applications
- RF and Microwave Systems: Suitable for various RF and microwave applications due to its wide frequency range and high performance characteristics.
- Communication Systems: Ideal for use in communication systems requiring precise gain control and AGC functionality.
- Test and Measurement Equipment: Can be used in test and measurement equipment where accurate signal leveling is necessary.
- Industrial and Military Applications: Operates over the industrial temperature range, making it suitable for harsh environment applications.
Q & A
- What is the frequency range of the AD8368?
The AD8368 operates from low frequencies up to 800 MHz.
- What is the gain range of the AD8368?
The gain range is −12 dB to +22 dB, scaled accurately to 37.5 dB/V.
- How does the AD8368 implement automatic gain control (AGC)?
The AD8368 can be configured as a complete AGC system using the on-board rms detector, allowing for signal leveling independent of the waveform crest factor.
- What is the supply voltage range for the AD8368?
The supply voltage range is 4.5 V to 5.5 V.
- How much current does the AD8368 consume?
The AD8368 consumes 60 mA of current and can be fully powered down to <3 mA by grounding the ENBL pin.
- What is the operating temperature range of the AD8368?
The operating temperature range is −40°C to +85°C.
- What package type is the AD8368 available in?
The AD8368 is available in a 24-lead LFCSP package.
- What is the noise figure of the AD8368 at maximum gain?
The noise figure at maximum gain is 9.5 dB.
- What is the output IP3 of the AD8368 at 140 MHz?
The output IP3 at 140 MHz is 33 dBm.
- Can the AD8368 be used in harsh environment applications?
Yes, the AD8368 operates over the industrial temperature range, making it suitable for harsh environment applications.
