ADA4099-2BRZ

Overview

The ADA4099-2BRZ is a dual precision operational amplifier from Analog Devices, featuring Over-The-Top input capability and rail-to-rail output. It operates on supply voltages ranging from 3.15 V to 50 V with a typical gain-bandwidth product of 8 MHz and a slew rate of 5.5 V/µs. The device offers low input offset voltage (±40 µV max) and drift (±0.4 µV/°C max), along with low noise density of 7 nV/√Hz at 100 Hz. It includes a low-power shutdown function drawing a maximum of 20 µA. The component is housed in an 8-lead SOIC package and supports an extended operating temperature range of -55°C to +150°C.

Feature Summary

• Over-The-Top input architecture allows common-mode voltage operation up to +VS + 70 V, independent of the positive supply rail.
• Robust input protection tolerates differential overdrive voltages up to ±80 V without damage or phase reversal.
• Low power shutdown mode reduces quiescent current to a maximum of 20 µA for energy-efficient system management.
• High electrostatic discharge resilience provides ±2 kV HBM and ±1.25 kV FICDM protection ratings.

Applications

• Industrial sensor signal conditioning
• Supply current sensing applications
• Battery and power supply monitoring systems
• Front-end amplifiers in abusive environments

Procurement Notes

Verify the specific grade (B or H) required for your application, as performance specifications such as offset voltage and operating temperature range differ between grades. Confirm that the 8-lead SOIC_N package matches your PCB footprint requirements. Ensure proper ESD handling procedures are followed during assembly due to the sensitivity of the CMOS input stages. Cross-reference the datasheet revision A specifications against your design timeline to account for any parameter updates.

Selection Notes

Select this component when high-voltage signal detection above the positive supply rail is necessary without external level shifting. The dual-channel configuration is suitable for differential sensing or dual-loop control systems requiring matched characteristics. Consider the thermal resistance of the SOIC package if driving significant load currents near the upper temperature limits. The low noise density makes it appropriate for precision measurement circuits where signal integrity is critical.

Part Context

This part belongs to the ADA4099 family of robust, precision operational amplifiers designed for demanding industrial environments. The dual-channel variant shares core architectural features with the single-channel ADA4099-1 but provides two independent amplifiers in a compact 8-lead package. The family emphasizes Over-The-Top functionality, allowing inputs to exceed the positive supply voltage while maintaining precision and stability.

Replacement Considerations

Direct functional substitutes within the same package include other dual-channel variants from the ADA4099 series, such as the ADA4099-2ARMZ (MSOP) or ADA4099-2BCPZ (LFCSP), provided pin compatibility and thermal profiles meet design constraints. Verify that alternative parts support the required Over-The-Top voltage range and shutdown logic levels.

FAQ

How does the Over-The-Top input stage affect input bias current?

When the common-mode input voltage exceeds +VS by more than 1.5 V, the internal circuitry switches to a common base input pair. This causes the input bias current to increase significantly, typically reaching approximately 82.5 µA, compared to less than 4 nA in the standard operating region.

What is the behavior of the output during the shutdown state?

When the SHDNx pins are asserted high (above −VS + 1.5 V), the amplifier enters a low-power shutdown state. In this condition, the output impedance becomes very high, effectively disconnecting the output driver from the load to minimize power consumption.

Can the device handle large differential input voltages?

Yes, the inputs are protected against temporary voltage excursions. The device can tolerate differential input voltages up to ±80 V without sustaining damage, thanks to internal protection resistors and diodes integrated into the input stage.