Analog Devices Inc. LT6604IUFF-5#TRPBF

Overview

LT6604IUFF-5#TRPBF from Analog Devices (formerly Linear Technology) is a dual, fully differential amplifier with integrated 4th-order 5MHz lowpass filters, designed as a precision ADC driver and antialiasing filter. It delivers >82dB SNR at 3V supply, 2VP-P output, ±0.05dB gain matching and <0.5° phase matching between channels, and supports resistor-programmable differential gain (e.g., 1× to 4×) for direct interfacing with high-speed SAR and pipeline ADCs.

For engineers reviewing the LT6604IUFF-5#TRPBF datasheet, LT6604IUFF-5#TRPBF pinout, LT6604IUFF-5#TRPBF application, or LT6604IUFF-5#TRPBF equivalent, key selection criteria include its guaranteed –40°C to +85°C operation, 4mm × 7mm QFN-34 package with exposed V– pad, differential input/output architecture, adjustable output common-mode voltage (VOCM), and verified performance in wireless infrastructure baseband filtering and medical imaging signal chains.

Technical Context

The LT6604IUFF-5#TRPBF integrates two independent, matched signal paths-each comprising a differential input stage, 4th-order Chebyshev-approximating lowpass filter, and differential output buffer-within a single monolithic die. Its architecture eliminates external passive filter components while preserving exceptional channel-to-channel gain (<±0.05dB) and phase (<±0.5°) matching across DC–5MHz.

Each channel uses external R_IN resistors (e.g., 806Ω for unity gain) to set DC gain per the 806Ω/R_IN ratio, and features separate VMID (mid-supply bias reference) and VOCM (output common-mode control) pins enabling precise level-shifting for ADC interface compliance. The device operates from 3V, 5V, or ±5V supplies with full specification over industrial temperature range.

Key Specifications

Pinout & Package

LT6604IUFF-5#TRPBF is housed in a 34-lead (4mm × 7mm) plastic QFN package with exposed thermal pad (Pin 35 = V–), requiring soldering to PCB for thermal and electrical integrity. Pin count and layout match the LT6604 family's standardized UFF footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual differential amplifier and filter applications.

Compared with LTC6409CUD#PBF and AD8138ARZ, the LT6604IUFF-5#TRPBF uniquely combines dual-channel integration, factory-trimmed 5MHz filtering, and VOCM-adjustable outputs-reducing BOM count by ≥6 passive components per channel and eliminating filter tuning effort in production.

Availability

LT6604IUFF-5#TRPBF is available at Aetrix Electronics and suitable for wireless infrastructure baseband filtering, medical ultrasound signal conditioning, and high-speed test equipment requiring stable component supply across extended temperature and volume production cycles.

Supply support for LT6604IUFF-5#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LT6604IUFF-5#TRPBF belongs to ADI's legacy Linear Technology precision signal conditioning portfolio, engineered specifically for high-fidelity, dual-channel analog front-ends in data acquisition, instrumentation, and communications infrastructure where integrated filtering, gain matching, and common-mode flexibility are critical.

FAQ

What is the operating temperature range specified for the LT6604IUFF-5#TRPBF?

The LT6604IUFF-5#TRPBF is fully specified and tested over the industrial temperature range of –40°C to +85°C, as confirmed by the "I" grade designation in the part number and documented in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.

Can the LT6604IUFF-5#TRPBF drive a 50Ω differential load directly?

The LT6604IUFF-5#TRPBF is not optimized for direct 50Ω differential loading: its typical output drive capability is rated for ≥800Ω loads. Driving 50Ω loads will cause significant gain compression and increased distortion; a 1:4 impedance-matching transformer or external buffer stage is required for 50Ω interface applications.

How is gain programmed on the LT6604IUFF-5#TRPBF?

Gain on the LT6604IUFF-5#TRPBF is set per channel using two identical external resistors (R_IN) connected to +IN and –IN pins. The DC gain equals 806Ω/R_IN; for example, 806Ω yields unity gain, 403Ω yields 2×, and 201.5Ω yields 4×. This resistor-based method avoids trimming or digital configuration.

Does the LT6604IUFF-5#TRPBF support single-ended input signals?

Yes, the LT6604IUFF-5#TRPBF supports single-ended inputs via AC coupling: Figure 2 of the datasheet shows a standard configuration using 0.1μF series capacitors and matched 806Ω resistors to each input pin, allowing arbitrary common-mode input levels while maintaining differential operation internally.

What is the function of the exposed pad (Pin 35) on the LT6604IUFF-5#TRPBF?

The exposed pad (Pin 35) on the LT6604IUFF-5#TRPBF is electrically connected to V– and must be soldered to the PCB ground plane. It serves dual purposes: lowering thermal resistance (θ_JC = 4°C/W) for reliable 34mA/channel operation and providing a low-inductance return path for high-frequency currents to minimize noise and distortion.