ADA4351-2ACPZ

Overview

The ADA4351-2 is a compact, dual-channel precision programmable gain transimpedance amplifier (PGTIA) designed for high-accuracy current-to-voltage conversion. It integrates two low off-leakage switches per channel with user-selectable external resistors to provide flexible gain configurations. The device features an offset voltage of ±100 μV maximum at 25°C and operates on single supplies from +2.7 V to +5.5 V or dual supplies from ±1.85 V to ±2.75 V. Packaged in a 16-lead LFCSP measuring 3 mm × 3 mm without an exposed pad, it reduces PCB area significantly compared to discrete solutions.

Feature Summary

• Integrates proprietary low off-leakage analog switches arranged in a Kelvin configuration to eliminate gain error caused by switch resistance.
• Features separate analog and digital power supplies with integrated logic level shifting, allowing the digital interface to remain ground referenced while the amplifier operates on bipolar supplies.
• Includes internal compensation via a 3 pF feedback capacitor for gains exceeding 50 kΩ, reducing the need for external components.
• Provides make-before-break switching functionality to maintain a closed feedback loop during transitions, preventing output overdrive glitches.

Applications

• Precision current to voltage conversion
• Photodetector interface and amplification
• Optical networking equipment
• Instrumentation including spectroscopy and chromatography

Procurement Notes

Verify the specific package variant and revision status directly with Analog Devices before procurement. Confirm that the application environment remains within the specified operating temperature range of −40°C to +125°C. Ensure proper ESD handling protocols are followed due to the sensitivity of the CMOS input stages. Validate supply voltage levels against the absolute maximum ratings to prevent permanent damage.

Selection Notes

Select this component when a compact solution is required for measuring small currents across a wide dynamic range. It is suitable for applications demanding high DC precision and low offset drift over extended temperature ranges. Consider this part if direct driving of 16-bit precision ADCs is necessary without additional buffering stages.

Part Context

This device belongs to the ADA4351 family of precision analog front-end solutions. It serves as a complete PGTIA alternative to discrete operational amplifiers and mechanical or solid-state switches. The monolithic integration addresses common issues associated with board space constraints and parasitic capacitance in high-performance signal chains.

Replacement Considerations

Public confirmed substitute part numbers: ADA4352-2ACPZ-R7