ADA4945-1ACPZ-R2

Overview

The ADA4945-1ACPZ-R2 is a high-speed, fully differential ADC driver manufactured by Analog Devices Inc. It operates on a power supply range of 3 V to 10 V and features two selectable power modes: full power mode consuming 4 mA at 145 MHz bandwidth, and low power mode consuming 1.4 mA at 80 MHz bandwidth. The device provides a slew rate of 600 V/µs in full power mode, an input voltage noise of 2.0 nV/√Hz, and a maximum offset voltage of ±115 µV across the -40°C to +125°C temperature range. It is housed in a 16-lead LFCSP package.

Feature Summary

• Features two selectable power modes for balancing performance and power consumption
• Provides rail-to-rail output swing with wide input common-mode voltage range
• Includes adjustable output clamps for ADC input protection
• Utilizes internal common-mode feedback loop for exceptional output balance

Applications

• Low power Sigma-Delta, PulSAR, and SAR ADC drivers
• Single-ended to differential converters
• Differential buffers
• Medical imaging systems
• Process control applications

Procurement Notes

Verify the specific suffix R2 against official documentation to confirm packaging details, as datasheet specifications primarily reference standard configurations. Ensure compatibility with the required operating temperature range and power supply constraints before integration into the design.

Selection Notes

Select this component when driving high-resolution SAR or Sigma-Delta ADCs requiring low noise and distortion. Choose the low power mode for battery-operated portable electronics where 1.4 mA quiescent current is critical. Use the full power mode for applications demanding maximum bandwidth and fast settling times.

Part Context

This part belongs to the ADA4945-1 series of fully differential amplifiers designed specifically for analog-to-digital converter interfaces. It is fabricated using a silicon germanium complementary bipolar process to achieve low distortion levels. The series supports various gain configurations through external feedback networks.

Replacement Considerations

Consult official substitution guides for verified alternatives. Generic family members may share similar pinouts but often differ in electrical characteristics such as bandwidth, noise, or power consumption.