Overview
The AD8138ARMZ from Analog Devices Inc. is a high-performance, low-distortion differential amplifier designed for differential signal processing. It can be used as a single-ended-to-differential amplifier or as a differential-to-differential amplifier. Manufactured on the proprietary ADI XFCB bipolar process, the AD8138 simplifies differential signal amplification and driving, making it as easy to use as an op amp. It features a unique internal feedback circuit that provides balanced output gain and phase matching, suppressing even order harmonics and minimizing gain errors associated with external gain setting resistors.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | 8-Lead MSOP |
| Operating Temperature Range | −40°C to +85°C |
| Bandwidth (-3 dB) | 320 MHz |
| Supply Voltage | ±5 V (for best distortion performance) |
| Common-Mode Level Adjustment | Adjustable via VOCM pin |
| Harmonic Distortion | Lowest harmonic distortion available in a differential amplifier |
Key Features
- Unique internal feedback circuit for balanced output gain and phase matching, suppressing even order harmonics.
- Minimizes gain errors associated with external gain setting resistors.
- Low harmonic distortion, making it ideal for driving high-performance ADCs.
- Adjustable common-mode level via VOCM pin, facilitating level-shifting for single-supply ADCs.
- Fast overload recovery to preserve sampling accuracy.
- Suitable for use as a gain block in IF and baseband signal chains due to high bandwidth and IP3.
Applications
- Differential signal amplification and driving in various signal processing and data acquisition systems.
- Driving high-performance ADCs (10-bit to 16-bit converters) at high frequencies.
- Communication systems requiring low distortion and high bandwidth.
- IF and baseband signal chains in communication systems.
- Defense and aerospace applications (supported by the AD8138-EP model).
Q & A
- What is the primary function of the AD8138ARMZ?
The AD8138ARMZ is a differential amplifier that can be used as a single-ended-to-differential amplifier or as a differential-to-differential amplifier.
- What is the bandwidth of the AD8138ARMZ?
The bandwidth of the AD8138ARMZ is 320 MHz).
- What is the operating temperature range of the AD8138ARMZ?
The operating temperature range is −40°C to +85°C).
- How does the AD8138ARMZ minimize harmonic distortion?
The AD8138ARMZ has a unique internal feedback circuit that suppresses even order harmonics and minimizes gain errors associated with external gain setting resistors).
- Can the common-mode level of the AD8138ARMZ be adjusted?
Yes, the common-mode level is adjustable via the VOCM pin).
- What types of packages are available for the AD8138?
The AD8138 is available in both SOIC and MSOP packages).
- What are some typical applications of the AD8138ARMZ?
Typical applications include driving high-performance ADCs, communication systems, IF and baseband signal chains, and defense and aerospace applications).
- How does the AD8138ARMZ simplify differential signal amplification?
The AD8138ARMZ simplifies differential signal amplification by providing balanced output gain and phase matching, and by eliminating the need for a transformer to drive ADCs).
- What is the recommended supply voltage for the best distortion performance?
The recommended supply voltage for the best distortion performance is ±5 V).
- Does the AD8138ARMZ support fast overload recovery?
Yes, the AD8138ARMZ supports fast overload recovery to preserve sampling accuracy).
