ADA4625-1ARDZ

Overview

The ADA4625-1ARDZ is a single-channel, precision JFET input operational amplifier manufactured by Analog Devices Inc. It features an 8-lead SOIC package with an exposed pad (EPAD). The device operates from a supply voltage range of 5 V to 36 V or ±2.5 V to ±18 V. Key electrical specifications include a typical gain bandwidth product of 18 MHz and a high slew rate of 48 V/µs. It exhibits low noise characteristics with a voltage noise density of 3.3 nV/√Hz at 1 kHz and a peak-to-peak noise of 0.15 µV from 0.1 Hz to 10 Hz. Input bias current is typically ±15 pA at 25°C, while the maximum offset voltage is ±80 µV. The output stage provides rail-to-rail swing capability.

Feature Summary

• JFET input architecture providing extremely low input bias current and high input impedance
• Rail-to-rail output stage enabling full dynamic range utilization in single-supply applications
• High-speed performance characterized by wide gain bandwidth and fast settling times
• Low noise profile suitable for amplifying small signals without significant degradation

Applications

• PLL filter amplifiers
• Transimpedance amplifiers
• Photodiode sensor interfaces
• Low noise charge amplifiers

Procurement Notes

Verify the specific ordering suffix 'RDZ' corresponds to the standard tube packaging configuration as defined in the manufacturer's official documentation. Confirm that the exposed pad connection requirements are met within the target PCB layout design to ensure proper thermal management and electrical grounding. Cross-reference the latest datasheet revision to validate all electrical parameters against the intended operating conditions.

Selection Notes

Select this component when designing circuits requiring high voltage operation combined with low noise and high speed. The rail-to-rail output allows for maximizing dynamic range in low voltage single-supply systems without needing a negative supply rail. Ensure the application benefits from the low input bias current provided by the JFET input stage for high-impedance signal sources.

Part Context

This part belongs to the ADA4625 family of high-voltage, single-supply, rail-to-rail output precision JFET operational amplifiers. The '-1' designation indicates a single-channel configuration, distinguishing it from dual-channel variants like the ADA4625-2. The device represents an advancement in speed and low noise performance for this specific product category.

Replacement Considerations

The ADA4625-2ARDZ serves as a dual-channel alternative within the same family. Other related precision JFET op amps include the AD8510, AD8610, ADA4610-1, ADA4622-1, and ADA4627-1. Verify pin compatibility and electrical parameter alignment before substituting.

FAQ

Does the ADA4625-1 exhibit phase reversal when the input voltage exceeds the supply rails?

No, the device is designed to have no phase reversal even when the input range exceeds either supply rail by 200 mV.

What is the input common-mode voltage range relative to the negative supply?

The input common-mode voltage range includes the negative supply (V−), extending down to approximately 0.2 V below V−.

Is the ADA4625-1 unity-gain stable?

Yes, the amplifier is unity-gain stable across its specified operating conditions.