DG409LDY

Overview

The DG409LDY is a dual 4-channel differential analog multiplexer manufactured by Vishay Siliconix. It connects one of four differential inputs to a common dual output using a 2-bit binary address (A0, A1). The device operates on single supplies from 3 V to 12 V or dual supplies from ±3 V to ±6 V. Key electrical parameters include a typical drain-source on-resistance of 17 Ω, enable turn-on time of 38 ns, and enable turn-off time of 18 ns. It features low leakage current of 0.2 nA maximum, charge injection of 1 pC, and 82 dB off-isolation at 1 MHz. The component is housed in a 16-pin SOIC package and supports an operating temperature range of -40 °C to +85 °C.

Feature Summary

• Pin-for-pin compatibility with industry standard DG408 and DG409 devices
• Break-before-make switching action to prevent momentary crosstalk between adjacent channels
• TTL, CMOS, and LV logic compatible for simple interface integration
• BiCMOS wafer fabrication technology enabling low power consumption and high accuracy

Applications

• Data acquisition systems
• Battery operated equipment
• Portable test equipment
• Sample and hold circuits
• Audio and video signal routing

Procurement Notes

Verify the specific suffix 'LDY' corresponds to the 16-pin narrow SOIC package configuration. Confirm RoHS compliance status if required, as datasheets may list both compliant and non-compliant variants. Ensure the ordering code matches the exact voltage and packaging requirements for the target design.

Selection Notes

Select this component when differential signal routing is required within a compact surface-mount footprint. The DG409LDY is suitable for designs needing fast switching speeds and low charge injection. Verify that the supply voltage range aligns with the system's available power rails, as performance varies across different supply configurations.

Part Context

The DG409LDY belongs to the DG409L series, which serves as a low-voltage companion to the legacy DG409. It utilizes BiCMOS technology to achieve improved performance metrics compared to older CMOS counterparts. This series is designed to maintain pin compatibility while offering enhanced speed and lower power dissipation for modern electronic applications.

Replacement Considerations

DG409LDY-E3

FAQ

What is the maximum analog signal range for the DG409LDY?

The analog signal range extends from V- to V+, allowing operation across the full supply voltage range of 3 V to 12 V for single supply or ±3 V to ±6 V for dual supply configurations.

How does the DG409LDY handle channel switching to prevent interference?

It employs a guaranteed break-before-make switching action, which disconnects the previous channel before connecting the new one, thereby protecting against momentary crosstalk between adjacent channels.

What is the typical charge injection value for this multiplexer?

The DG409LDY exhibits a typical charge injection of 1 pC, contributing to its high accuracy in precision analog signal processing applications.