ALD1702SAL

Overview

The ALD1702SAL is a monolithic precision operational amplifier manufactured using Advanced Linear Devices' ACMOS silicon gate CMOS process. It features rail-to-rail input and output voltage ranges, making it suitable for +5V single supply or ±5V dual supply systems. The device offers a unity gain bandwidth of 1.5MHz, a slew rate of 2.1V/µs, and extremely low input bias currents with a typical value of 1.0pA. It includes on-chip offset voltage trimming to eliminate the need for external nulling in most applications. The component is housed in an 8-pin Small Outline Plastic DIP (SOIC) package.

Feature Summary

• Rail-to-rail input and output voltage ranges allow implementation of numerous analog serial stages without losing operating voltage margin.
• Extremely low input bias currents ensure high source impedance applications are accommodated without signal distortion.
• On-chip offset voltage trimming allows the device to be used without external nulling circuits in most applications.
• Internally compensated for unity gain stability without requiring external frequency compensation components.

Applications

• Voltage amplifier
• Photodiode amplifier
• Data acquisition systems
• Active filters
• Picoammeter

Procurement Notes

Verify that the ordering suffix 'L' denotes lead-free (RoHS) compliance as specified by the manufacturer. Confirm the package type matches the required SOIC-8 footprint. Ensure the operating temperature range aligns with the application requirements, noting the standard range is 0°C to +70°C for this package variant. Cross-reference the specific part number against the latest datasheet revision to confirm electrical characteristics.

Selection Notes

Select this component when a precision operational amplifier with rail-to-rail capabilities is required for 5V single-supply or ±5V dual-supply systems. The low input bias current makes it ideal for high-impedance sensor interfaces. Consider the internal offset trimming feature if minimizing external calibration complexity is a priority. Verify that the load capacitance requirements fall within the stable driving limits defined in the datasheet.

Part Context

The ALD1702 series belongs to a family of precision operational amplifiers designed for mixed digital-analog applications sharing a common 5V power supply. The ALD1702SAL specifically refers to the standard version in an 8-pin SOIC package. Variants such as ALD1702A and ALD1702B offer tighter offset voltage specifications, while the ALD1703 provides different performance trade-offs. All share the same pin configuration compatible with µA741 and ICL7611 types.

Replacement Considerations

Public confirmed substitute part numbers include ALD1702ASAL, ALD1702BSAL, ALD1702PAL, and ALD1702DA. These variants share the same pinout but may differ in offset voltage specifications or operating temperature ranges. Verify that any replacement meets the specific electrical requirements of the design, particularly regarding input bias current and offset drift.

FAQ

Does the ALD1702SAL require external frequency compensation?

No, the device is internally compensated for unity gain stability and does not require external frequency compensation components.

What is the maximum load capacitance the ALD1702SAL can drive in a unity gain buffer configuration?

In a non-inverting unity gain connection, the device can typically drive up to 400pF of capacitive load without stability problems.

How does the ALD1702SAL handle rail-to-rail input operation?

It uses complementary p-channel and n-channel input differential stages connected in parallel to accomplish rail-to-rail input common mode voltage range.