AD8337BCPZ-REEL7

Overview

The AD8337BCPZ-REEL7 is a low noise, single-ended, linear-in-dB, general-purpose variable gain amplifier (VGA) from Analog Devices. It operates at frequencies from DC to 100 MHz with a −3 dB bandwidth of 280 MHz. The device features a nominal gain range of 0 dB to 24 dB and a gain scaling factor of 19.7 dB/V referenced to VCOM. It includes an uncommitted current feedback preamplifier input and supports supply voltages of +5 V or ±2.5 V/±5 V. Power consumption is approximately 78 mW with ±2.5 V supplies.

Feature Summary

• Linear-in-dB gain control architecture with excellent bandwidth uniformity across the entire gain range.
• Low output-referred noise suitable for driving high-speed analog-to-digital converters.
• Integrated uncommitted high-speed current feedback operational amplifier for flexible circuit configurations.
• DC-coupled operation enabling precise gain adjustment for negative-going pulses.

Applications

• Gain trim applications
• PET scanners
• High performance AGC systems
• Industrial and medical ultrasound
• Radar receivers

Procurement Notes

Verify the specific suffix REEL7 against official documentation to confirm packaging format and quantity specifications. Ensure compatibility with the required operating temperature range of -40°C to +85°C. Confirm that the LFCSP-8 package dimensions align with the target PCB layout constraints. Cross-reference the datasheet revision to validate all electrical parameters before finalizing procurement orders.

Selection Notes

Select this component when a low-noise VGA with wide bandwidth is required for signal conditioning. The integrated preamplifier allows for flexible gain configuration using external resistors. Consider the dual-supply capability if handling negative pulse signals from photodiodes or photomultiplier tubes is necessary. Evaluate power dissipation requirements based on the chosen supply voltage configuration.

Part Context

The AD8337 utilizes Analog Devices' proprietary X-AMP architecture. It combines a 24 dB attenuator with a fixed-gain output amplifier and a configurable preamplifier. This structure provides a versatile solution for applications requiring precise gain control and high linearity. The device is designed for industrial and medical environments where stability and low noise are critical.

Replacement Considerations

Consult the official ordering guide for confirmed substitute part numbers. Verify pinout compatibility and electrical specifications before substituting any alternative components.

FAQ

How is the preamplifier gain configured?

The preamplifier gain is established using external resistors connected to the PRAO pin. A noninverting gain of 6 dB (2x) is achieved with two 100 Ω resistors.

What is the gain scaling factor?

The gain scales linearly at 19.7 dB/V, referenced to the VCOM pin.