Analog Devices Inc. ADA4625-2ARDZ-R7

Overview

ADA4625-2ARDZ-R7 from Analog Devices is a dual-channel, precision JFET-input operational amplifier optimized for high-voltage, low-noise, fast-settling applications. It delivers 18 MHz gain bandwidth, 48 V/µs slew rate, 3.3 nV/√Hz voltage noise density at 1 kHz, ±80 µV max offset voltage, and rail-to-rail output swing - enabling high-fidelity signal conditioning in PLL filter stages and photodiode sensor interfaces.

For engineers reviewing the ADA4625-2ARDZ-R7 datasheet, ADA4625-2ARDZ-R7 pinout, ADA4625-2ARDZ-R7 application, or ADA4625-2ARDZ-R7 equivalent, key selection criteria include dual-channel settling time (700 ns to 0.01%), input bias current (±15 pA typ), single-supply operation down to 5 V, and SOIC-8 EPAD thermal performance - critical for precision analog front-ends in industrial and test equipment.

Technical Context

The ADA4625-2ARDZ-R7 employs a dual JFET input stage with extended common-mode range (down to V− −0.2 V and up to V+ +0.2 V), eliminating phase reversal beyond supply rails by 200 mV. Its two-stage gain architecture combines high-impedance GM1 and GM2 blocks to achieve unity-gain stability and 75° phase margin while maintaining low noise and high slew rate.

Output stage uses complementary NPN/PNP emitter followers with active base clamping for rail-to-rail sourcing/sinking (±46 mA short-circuit current) and low dropout (<1 V at ±33 mA). The exposed pad (EPAD) supports thermal management via connection to GND, V+, or V− plane - essential for stable operation across −40°C to +125°C.

Key Specifications

Pinout & Package

ADA4625-2ARDZ-R7 is housed in an 8-lead SOIC package with exposed pad (RD-8-4), offering θJA = 52.8°C/W and θJC = 5.7°C/W for robust thermal performance under continuous load.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel precision JFET op amp applications.

Compared with ADA4625-2ARDZ-R7, ADA4622-2ARMZ trades bandwidth and noise for cost, while OPA2140IDR adds automotive qualification at the expense of EMI immunity and thermal efficiency - making ADA4625-2ARDZ-R7 optimal for high-performance industrial instrumentation where speed, noise, and thermal headroom are critical.

Availability

ADA4625-2ARDZ-R7 is available at Aetrix Electronics and suitable for PLL filter design, photodiode sensing, and low-noise charge amplification requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADA4625-2ARDZ-R7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and consumer markets since 1965.

The ADA4625 family targets high-voltage, low-noise, fast-settling precision analog signal chains - specifically engineered for demanding applications like PLL loop filters, photodiode interfaces, and charge amplifiers where JFET input performance cannot be compromised.

FAQ

What is the maximum supply voltage for ADA4625-2ARDZ-R7?

The ADA4625-2ARDZ-R7 supports absolute maximum supply voltage of 40 V, with recommended operating range from 5 V to 36 V single supply or ±2.5 V to ±18 V dual supply. Operation at 36 V enables direct interface with industrial 24 V systems while maintaining full specification compliance across −40°C to +125°C.

Does ADA4625-2ARDZ-R7 require external compensation for unity-gain stability?

No, ADA4625-2ARDZ-R7 is internally compensated and unity-gain stable, with 75° phase margin at AV = 1. No external compensation components are needed - simplifying layout and ensuring predictable performance in inverting/noninverting configurations across its full supply and temperature range.

How does the exposed pad (EPAD) on ADA4625-2ARDZ-R7 affect thermal performance?

The EPAD on ADA4625-2ARDZ-R7 reduces thermal resistance to 5.7°C/W (θJC) when soldered to a copper plane. Leaving it floating degrades θJA from 52.8°C/W to >70°C/W - risking thermal shutdown under sustained 4.5 mA per channel operation. Connection to GND is recommended for optimal EMI and thermal performance.

Can ADA4625-2ARDZ-R7 drive a 600 Ω load while maintaining rail-to-rail output swing?

Yes, ADA4625-2ARDZ-R7 delivers rail-to-rail output swing into 600 Ω loads: VOH = 17.0 V and VOL = −17.4 V at ±18 V supply, and VOH = 4.65 V and VOL = 0.25 V at 5 V supply. This capability eliminates need for output level-shifting in legacy 12-bit DAC or ADC interfacing.

What is the guaranteed settling time for ADA4625-2ARDZ-R7 at 0.01% accuracy?

ADA4625-2ARDZ-R7 achieves 700 ns settling time to 0.01% for a 10 V step input (±18 V supply) and 1350 ns at 5 V supply - verified under RL = 2 kΩ and CL = 15 pF. These values are specified in the datasheet Table 2 and Table 3, ensuring predictable timing in high-speed feedback loops.