LT6604CUFF-2.5#TRPBF

Overview

The LT6604CUFF-2.5#TRPBF is a dual very low noise, differential amplifier and 2.5MHz lowpass filter in a 34-lead QFN package. It integrates two matched fully differential amplifiers with fourth-order Chebyshev filters. The device supports 3V, 5V, and ±5V supplies. Gain is set by external resistors (1580Ω/RIN). It features >86dB SNR at unity gain, adjustable output common mode voltage, and guaranteed channel-to-channel gain/phase matching.

Feature Summary

• Integrates two matched fully differential amplifiers with fourth-order 2.5MHz lowpass filters approximating a Chebyshev response
• Provides resistor-programmable differential gain using only two external input resistors per channel
• Features adjustable output common mode voltage for direct interfacing to ADCs and level shifting
• Ensures high channel-to-channel gain and phase matching for precision signal processing

Applications

• Dual differential ADC driver and filter
• Single-ended to differential converter
• High-speed ADC antialiasing and DAC smoothing in wireless infrastructure
• Matched dual differential gain or filter stage
• Common mode translation of differential signals

Procurement Notes

Verify the C suffix indicates the commercial temperature range (0°C to 70°C) rather than the industrial grade (-40°C to 85°C). Confirm the UFF package type matches the design requirements. Ensure the TRPBF designation corresponds to tape and reel packaging with lead-free finish. Cross-reference the specific lot markings against the datasheet order information table.

Selection Notes

Select this component when precise channel matching and low noise are critical for differential signal paths. The fixed 2.5MHz cutoff requires verification against system bandwidth needs. Consider the power supply constraints as the device is specified for 3V, 5V, and ±5V operation. Evaluate the need for adjustable output common mode voltage to interface directly with downstream analog-to-digital converters without additional level shifting circuitry.

Part Context

This part belongs to the LT6604 family of dual differential amplifiers with integrated lowpass filters. It is functionally similar to the LT6600 and LT6601 series but offers dual channels in a single package. The device replaces discrete solutions requiring multiple precision components for gain and filtering, reducing board space and component count while improving performance consistency.

Replacement Considerations

LT6604IUFF-2.5#TRPBF: Industrial temperature grade (-40°C to 85°C) equivalent.

FAQ

How is the differential gain configured?

The differential gain is set by two equal external input resistors (RIN) connected to the +IN and -IN pins. The DC gain is calculated as 1580Ω divided by RIN.

What is the purpose of the VOCM pin?

The VOCM pin programs the DC common mode voltage of the differential output. It can be tied to the VMID pin for mid-supply operation or driven by an external reference for level shifting.

Does the device support single-ended inputs?

Yes, the device can process single-ended signals by AC-coupling them through capacitors to the differential inputs, allowing conversion to a differential output with arbitrary common mode levels.