ADA4350ARUZ

Overview

The ADA4350ARUZ is a FET input analog front end with an integrated ADC driver, designed for photodetectors and sensors requiring precise gain selection to maximize dynamic range. It integrates a low-noise FET amplifier, switching network, and output driver in a single IC. The device supports ±5 V dual or +3.3 V single supply operation within a 3.3 V to 12 V operating range. Key electrical parameters include a typical input bias current of ±0.25 pA at 25°C, a gain bandwidth product of 175 MHz, and a quiescent current of 8.5 mA at ±5 V. It features six externally configurable feedback networks controlled via SPI or parallel logic, housed in a 28-lead TSSOP package rated for −40°C to +85°C.

Feature Summary

• Integrates a low noise FET input amplifier with extremely low input bias current suitable for high impedance sensors.
• Includes an internal switching network allowing independent selection of up to six external feedback networks to match sensor capacitance.
• Features an integrated ADC driver capable of differential or single-ended modes with adjustable output common-mode voltage.
• Supports control via Serial Peripheral Interface (SPI) or parallel logic for flexible system integration.

Applications

• Current to voltage (I to V) conversions
• Photodiode preamplifiers
• Chemical analyzers
• Mass spectrometry
• Data acquisition systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct packaging and temperature grade. Confirm that the required supply voltages align with the specified operating range of 3.3 V to 12 V for analog supplies and 3.3 V to 5.5 V for digital supplies. Ensure interface compatibility with either SPI or parallel control logic before finalizing procurement.

Selection Notes

Select this component when designing circuits for photodetectors requiring minimal input bias current and low voltage noise. Consider the 175 MHz gain bandwidth product and the ability to configure external feedback networks for transimpedance applications. Verify that the 28-lead TSSOP package dimensions fit the PCB layout constraints and that the thermal resistance characteristics are adequate for the expected power dissipation under load.

Part Context

The ADA4350 belongs to Analog Devices' family of precision analog front ends designed for signal conditioning in measurement systems. It combines amplification, switching, and driving capabilities into one unit, reducing component count compared to discrete solutions. This integration simplifies the design of high-performance data acquisition chains for scientific and industrial instrumentation.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.