AD8138AR-REEL7

Overview

The AD8138AR-REEL7 is a low distortion differential ADC driver manufactured by Analog Devices Inc. It features a -3 dB bandwidth of 320 MHz at G = +1 and a slew rate of 1150 V/µs. The device offers fast settling to 0.01% in 16 ns and overdrive recovery of 4 ns. Harmonic distortion is specified at -94 dBc for the second harmonic and -114 dBc for the third harmonic at 5 MHz into an 800 Ω load. Input voltage noise is 5 nV/√Hz with a typical offset voltage of 1 mV. It operates on a wide supply range from +3 V to ±5 V, consuming 90 mW at 5 V.

Feature Summary

• Provides easy single-ended-to-differential conversion with adjustable output common-mode voltage via the VOCM pin.
• Features unique internal feedback that ensures balanced output gain and phase matching while suppressing even-order harmonics.
• Minimizes gain errors associated with mismatches in external gain-setting resistors through its internal circuit architecture.

Applications

• ADC drivers
• Single-ended-to-differential converters
• IF and baseband gain blocks
• Differential buffers
• Line drivers

Procurement Notes

Verify the specific package type against the datasheet, as the AD8138 is available in both 8-Lead SOIC and MSOP packages. Confirm the REEL7 suffix indicates tape and reel packaging suitable for automated assembly. Ensure the operating temperature range of -40°C to +85°C meets system requirements. Cross-reference the manufacturer part number with official Analog Devices documentation to confirm current status and revision history.

Selection Notes

Select this component when driving high-performance 10-bit to 16-bit ADCs without requiring transformers. It is suitable for applications preserving low-frequency and DC information. Consider its high bandwidth and IP3 for IF and baseband signal chains. Evaluate power consumption relative to the supply voltage and ensure thermal dissipation limits are respected within the SOIC or MSOP package constraints.

Part Context

The AD8138 represents a major advancement over standard op amps for differential signal processing. Manufactured on Analog Devices' proprietary XFCB bipolar process, it simplifies differential signal amplification. The device eliminates the need for transformers in high-performance ADC interfaces, allowing direct level-shifting for single-supply operation while maintaining high accuracy and low distortion.

Replacement Considerations

Check for AD8138ARMZ or AD8138ARZ variants which share the same core functionality but may differ in packaging (MSOP vs. SOIC) or reel specifications. Verify pin compatibility and electrical parameters before substitution.