Overview
The AD8138AR-REEL7, produced by Analog Devices Inc., is a low distortion differential ADC driver that significantly enhances differential signal processing. It can be used as either a single-ended-to-differential amplifier or a differential-to-differential amplifier. Manufactured using the proprietary ADI XFCB bipolar process, the AD8138 offers a -3 dB bandwidth of 320 MHz and delivers differential signals with minimal harmonic distortion. This component simplifies differential signal amplification and driving, making it as easy to use as an op amp while providing superior performance.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| -3 dB Bandwidth | 250 | 320 | MHz | |
| Slew Rate | 330 | V/μs | ||
| Input Voltage Range | -3.8 | 3.8 | V | |
| Input Resistance (Differential) | 6 | MΩ | ||
| Input Resistance (Common Mode) | 3 | MΩ | ||
| Input Offset Voltage | -3.5 | 3.5 | mV | |
| Input Bias Current | 0.5 | μA | ||
| Operating Supply Range | ±1.4 | ±5.5 | V | |
| Quiescent Current | 18 | 20 | 23 | mA |
| Operating Temperature Range | -40 | 85 | °C |
Key Features
- Low Harmonic Distortion: The AD8138 offers exceptional harmonic distortion performance, making it suitable for driving high-performance ADCs.
- Adjustable Output Common-Mode Voltage: The output common-mode level can be set using the VOCM pin, allowing for easy level-shifting of input signals.
- High Bandwidth: With a -3 dB bandwidth of 320 MHz, the AD8138 is ideal for high-frequency applications.
- Fast Settling and Overdrive Recovery: The component features fast settling to 0.01% in 16 ns and fast overdrive recovery of 4 ns, ensuring high accuracy in sampling applications.
- Internal Feedback for Balanced Outputs: The internal feedback circuit ensures balanced output gain and phase matching, suppressing even-order harmonics and minimizing gain errors.
Applications
- ADC Drivers: The AD8138 is optimized for driving high-performance ADCs, preserving low frequency and DC information without the need for a transformer.
- Communication Systems: Its distortion performance makes it suitable for driving state-of-the-art 10-bit to 16-bit converters at high frequencies.
- IF and Baseband Signal Chains: The high bandwidth and IP3 of the AD8138 make it appropriate for use as a gain block in IF and baseband signal chains.
- Signal Processing and Data Acquisition: The component is well-suited for a wide variety of signal processing and data acquisition applications due to its offset and dynamic performance).
Q & A
- What is the primary function of the AD8138?
The AD8138 functions as a low distortion differential ADC driver, capable of operating as either a single-ended-to-differential amplifier or a differential-to-differential amplifier.
- What is the -3 dB bandwidth of the AD8138?
The -3 dB bandwidth of the AD8138 is 320 MHz.
- How does the AD8138 handle harmonic distortion?
The AD8138 features a unique internal feedback circuit that suppresses even-order harmonics, providing balanced output gain and phase matching.
- What is the operating temperature range of the AD8138?
The AD8138 operates over a temperature range of -40°C to +85°C.
- Can the AD8138 be used in high-frequency applications?
Yes, the AD8138 is suitable for high-frequency applications due to its high bandwidth and low harmonic distortion.
- How does the AD8138 adjust the output common-mode voltage?
The output common-mode voltage can be adjusted using the VOCM pin, allowing for easy level-shifting of input signals.
- What are the typical applications of the AD8138?
The AD8138 is commonly used as an ADC driver, in communication systems, IF and baseband signal chains, and various signal processing and data acquisition applications.
- What is the slew rate of the AD8138?
The slew rate of the AD8138 is 330 V/μs.
- How does the AD8138 handle overdrive recovery?
The AD8138 features fast overdrive recovery of 4 ns, ensuring high accuracy in sampling applications.
- What packages are available for the AD8138?
The AD8138 is available in both SOIC and MSOP packages.
