Analog Devices Inc. LT6604CUFF-2.5#TRPBF

Overview

LT6604CUFF-2.5#TRPBF from Analog Devices (formerly Linear Technology) is a dual, fully differential amplifier with integrated 4th-order 2.5MHz lowpass filters, designed as a high-performance ADC driver and antialiasing filter. It delivers >86dB SNR at 3V supply, 92dBc HD2/88dBc HD3 distortion at 1MHz, and <0.05dB gain matching between channels for precision signal conditioning in high-speed data acquisition systems.

For engineers reviewing the LT6604CUFF-2.5#TRPBF datasheet, LT6604CUFF-2.5#TRPBF pinout, LT6604CUFF-2.5#TRPBF application, or LT6604CUFF-2.5#TRPBF equivalent, this page provides verified specifications, channel-matched performance data, QFN-34 package layout, differential gain programming method, and real-world ADC interface guidance - all confirmed from the official LT6604-2.5 datasheet (Rev. FA).

Technical Context

The LT6604CUFF-2.5#TRPBF integrates two independent, matched signal chains - each comprising a resistor-programmable differential amplifier followed by a fixed-frequency 4th-order Chebyshev-approximating lowpass filter. Its architecture enables simultaneous common-mode translation (via VOCM and VMID pins) and precise differential gain control (1580Ω/R_IN) without external compensation.

It operates across 3V, 5V, and ±5V supplies, supports up to 5.5V_P-P differential output swing on 3V, and maintains <0.8° phase matching at 2.2MHz. The exposed thermal pad (Pin 35) is electrically tied to V– and must be soldered for thermal and electrical integrity.

Key Specifications

Pinout & Package

LT6604CUFF-2.5#TRPBF uses a 34-lead (4mm × 7mm) plastic QFN package with exposed thermal pad (Pin 35) connected to V–. The package is lead-free, RoHS-compliant, and rated for 0°C to 70°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT6604IUFF-2.5#TRPBF and ADA4940-2ARUZ, the LT6604CUFF-2.5#TRPBF uniquely combines factory-trimmed 2.5MHz filtering, guaranteed channel matching, and VOCM-programmable output level in a single QFN package - simplifying layout and validation for fixed-bandwidth, high-fidelity data acquisition.

Availability

LT6604CUFF-2.5#TRPBF is available at Aetrix Electronics and suitable for wireless infrastructure baseband, medical ultrasound beamforming, and automated test equipment requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for LT6604CUFF-2.5#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LT6604 family.

The LT6604 series was designed specifically for high-fidelity, dual-channel analog signal conditioning in precision data acquisition - emphasizing matched performance, integrated filtering, and seamless ADC interface capability.

FAQ

What is the operating temperature range for LT6604CUFF-2.5#TRPBF?

The LT6604CUFF-2.5#TRPBF is specified for 0°C to 70°C operation. While it is characterized and expected to function across –40°C to 85°C, only the 0°C to 70°C range is production-tested and guaranteed per the datasheet. For full industrial temperature assurance, use the LT6604IUFF-2.5#TRPBF variant instead. All thermal and electrical specs in the LT6604-2.5 datasheet (Rev. FA) apply within this commercial grade range for LT6604CUFF-2.5#TRPBF.

How is differential gain programmed on LT6604CUFF-2.5#TRPBF?

Differential gain on LT6604CUFF-2.5#TRPBF is set by two identical external resistors (R_IN) connected to each channel's +IN and –IN pins. The DC gain equals 1580Ω/R_IN: for unity gain, use 1580Ω; for 4× gain, use 402Ω. This resistor ratio defines the transfer function without requiring external op-amp feedback networks. The LT6604CUFF-2.5#TRPBF datasheet confirms this relationship across all supply voltages and temperature conditions.

Can LT6604CUFF-2.5#TRPBF drive a 50Ω differential load directly?

No - LT6604CUFF-2.5#TRPBF is not designed for direct 50Ω termination. Its outputs are optimized for ≥100Ω + 50pF loads. Driving 50Ω differentially would exceed its specified output current capability and degrade distortion and settling performance. For 50Ω instrument interfaces, use a 4:1 impedance-ratio transformer (e.g., Coilcraft TTWB-16A) with 402Ω source resistors, as shown in Figure 5 of the LT6604-2.5 datasheet, to present an effective 1600Ω differential load to the LT6604CUFF-2.5#TRPBF.

What is the purpose of the exposed pad (Pin 35) on LT6604CUFF-2.5#TRPBF?

The exposed pad (Pin 35) on LT6604CUFF-2.5#TRPBF is electrically connected to V– and serves dual thermal and electrical functions. It must be soldered to a PCB copper pour tied to the V– net to ensure proper heat dissipation (θ_JA = 43°C/W) and low-impedance return path for internal current sources. Leaving it unconnected or floating degrades thermal performance, increases junction temperature, and may cause instability or parametric drift in the LT6604CUFF-2.5#TRPBF.

Does LT6604CUFF-2.5#TRPBF support single-ended input signals?

Yes - LT6604CUFF-2.5#TRPBF supports single-ended inputs via AC coupling, as demonstrated in Figure 2 of the datasheet. A series capacitor and matched R_IN resistors convert the single-ended source into a differential stimulus referenced to VMID. This configuration preserves common-mode rejection and avoids DC offset errors. The LT6604CUFF-2.5#TRPBF's internal architecture ensures balanced gain and phase response even with asymmetric input drive, provided the external network is symmetric.