ADA4351-2ACPZ-R7

Overview

The ADA4351-2 is a compact, dual-channel precision programmable gain transimpedance amplifier (PGTIA) designed for precise small current measurement over a wide dynamic range. It features an integrated architecture with two low off-leakage switches per channel and supports gains from 200 Ω to beyond 10 MΩ. The device operates on single supplies (+2.7 V to +5.5 V) or dual supplies (±1.85 V to ±2.75 V). Key electrical parameters include a maximum offset voltage of ±100 μV at 25°C, input bias current of ±9 pA, and a gain bandwidth product of 8.5 MHz. It is housed in a 16-lead LFCSP package measuring 3 mm × 3 mm.

Feature Summary

• Integrates proprietary low off-leakage switches arranged in a Kelvin configuration to eliminate gain error caused by switch resistance.
• Provides flexible gain programming using two external resistors per channel, supporting a wide dynamic range from picoamps to milliamps.
• Features separate analog and digital power supplies with internal logic level shifting, allowing the digital interface to remain ground referenced while the amplifier operates on bipolar supplies.
• Includes make-before-break switching 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 that the specific ordering suffix matches the required tape and reel packaging format. Confirm that the digital supply voltage levels are compatible with the target system's logic thresholds before finalizing the design. Ensure proper ESD handling procedures are followed during assembly due to the sensitivity of the CMOS input stage.

Selection Notes

Select this component when a compact solution is required to replace discrete operational amplifiers and switches. It is suitable for applications demanding high DC precision across a wide temperature range without requiring multiple calibrations. Consider the available external resistor options to define the necessary gain steps for the specific sensor current range.

Part Context

This device belongs to the ADA4351 family of precision transimpedance amplifiers. It serves as a complete analog front-end solution, reducing printed circuit board area significantly compared to discrete designs. The monolithic integration simplifies signal chain design by combining amplification, switching, and level shifting into a single package.

Replacement Considerations

ADA4352-2ACPZ-R7