LT1993IUD-10#PBF

Overview

The LT1993IUD-10#PBF is a low distortion, low noise differential amplifier and ADC driver from Analog Devices Inc. It features a fixed gain of 20dB (10V/V) and a -3dB bandwidth of 700MHz. The device operates on a single 5V supply with typical current consumption of 100mA. It includes built-in 175MHz differential lowpass filtering accessible via dedicated filtered outputs. The component is housed in a compact 16-lead 3mm x 3mm QFN package.

Feature Summary

• Provides high-speed differential amplification with a fixed gain of 20dB for driving high-resolution analog-to-digital converters.
• Integrates a built-in 175MHz differential lowpass filter to reduce external component requirements.
• Features adjustable output common mode voltage control to eliminate the need for output transformers or AC-coupling capacitors.
• Supports both DC and AC coupled operation with minimal support circuitry.

Applications

• Differential ADC driver for imaging and communications systems
• IF sampling receivers
• SAW filter interfacing and buffering

Procurement Notes

Verify that the ordering suffix #PBF confirms lead-free status and RoHS compliance as specified by the manufacturer. Ensure the temperature grade 'I' matches the required operating range of –40°C to 85°C. Confirm the package type is the 16-lead 3mm x 3mm QFN. Cross-reference the datasheet revision to ensure pinout and electrical characteristics align with your design specifications.

Selection Notes

Select this component when a fixed 20dB gain and wide 700MHz bandwidth are required for signal conditioning. It is suitable for applications needing integrated anti-aliasing filtering without additional external components. Consider the 5V single-supply requirement and 100mA current draw during power budgeting. Verify that the input impedance and drive capabilities meet the source and load requirements of the target ADC or receiver stage.

Part Context

This part belongs to the LT1993 family of differential amplifiers designed specifically for driving high-speed ADCs. The 'I' suffix denotes an industrial temperature range, while 'UD' indicates the specific 16-lead QFN package. The '#PBF' suffix signifies a lead-free finish compliant with environmental standards. This variant provides a balance of performance and integration for communication transceiver applications.

Replacement Considerations

Consult official documentation for confirmed substitutes. No public substitute part numbers are verified in the provided source material.

FAQ

What is the purpose of the VOCM pin?

The VOCM pin sets the output common mode voltage. Without additional biasing, it also biases the inputs to this voltage, allowing direct coupling to ADCs without transformers.

How does the ENABLE pin function?

The ENABLE pin is a TTL logic input referenced to VEEC. A low voltage enables the device with typical 100mA current draw, while a high voltage disables it, reducing current to approximately 250µA.

What is the difference between the unfiltered and filtered outputs?

The unfiltered outputs (+OUT, –OUT) provide full bandwidth up to 700MHz. The filtered outputs (+OUTFILTERED, –OUTFILTERED) include an internal 175MHz lowpass filter formed by series resistors and capacitors.