Analog Devices Inc. LTC5577IUF#TRPBF

Overview

LTC5577IUF#TRPBF from Analog Devices (formerly Linear Technology) is a high-linearity, wideband active downconverting mixer IC optimized for RF receiver front-ends requiring +15 dBm input P1dB, +30 dBm IIP3, and 0 dB conversion gain across 300 MHz to 6 GHz RF and LO bands. It features differential 100 Ω IF output usable up to 1.5 GHz, integrated RF/LO transformers for single-ended 50 Ω interfaces, and operates from –40°C to 105°C in a 4 mm × 4 mm QFN package.

For engineers reviewing the LTC5577IUF#TRPBF datasheet, LTC5577IUF#TRPBF pinout, LTC5577IUF#TRPBF application, or LTC5577IUF#TRPBF equivalent, this page delivers verified specifications, validated pin functions, real-world RF/IF matching guidance, thermal sensing capability, and direct alternatives for wireless infrastructure, DPD observation, and CATV receiver designs.

Technical Context

The LTC5577IUF#TRPBF implements a double-balanced active mixer core with a high-speed limiting LO buffer and on-chip RF/LO transformers-enabling single-ended 50 Ω operation without external baluns. Its differential open-collector IF outputs require external pull-up inductors (e.g., 560 nH) and termination resistors (e.g., 115 Ω) to set output impedance between 50 Ω and 400 Ω.

It supports both high-side and low-side LO injection, delivers <±0.2 dB conversion gain flatness over 1900 ±140 MHz, maintains >10 dB RF/LO input return loss across multi-band configurations, and achieves –85 dBc 1/2IF spurs at 850 MHz-critical for high-dynamic-range receivers handling strong interferers.

Key Specifications

Pinout & Package

Package: 16-lead (4 mm × 4 mm) plastic QFN with exposed ground pad (Pin 17), rated for –40°C to 105°C case temperature operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar active downconverting mixer applications.

Compared with HMC1040LP4CE and MAX2037ETX+, the LTC5577IUF#TRPBF offers superior IIP3/P1dB balance across 300–6000 MHz, minimal external component count for matched 50 Ω interfaces, and on-die temperature sensing-making it optimal for space-constrained, thermally managed infrastructure receivers.

Availability

LTC5577IUF#TRPBF is available at Aetrix Electronics and suitable for wireless infrastructure receivers, DPD observation receivers, and CATV infrastructure requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC5577IUF#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and RF ICs for precision signal processing and power management.

The LTC5577IUF#TRPBF belongs to Linear's high-frequency RF mixer product line, designed specifically for demanding receiver applications in wireless infrastructure, test equipment, and broadband communications where linearity, bandwidth, and integration are critical.

FAQ

What is the recommended IF output termination for optimal IIP3 performance with the LTC5577IUF#TRPBF?

For optimal IIP3, the LTC5577IUF#TRPBF should be terminated into a 100 Ω differential load using 115 Ω resistors (R1/R2) and 560 nH pull-up inductors (L1/L2) as shown in Figure 1 of the datasheet. Lower impedances (e.g., 50 Ω) increase bandwidth but reduce IIP3 by ~2–3 dB; higher impedances (e.g., 200 Ω) improve IIP3 marginally but narrow IF bandwidth and raise output noise.

Does the LTC5577IUF#TRPBF support both high-side and low-side LO injection?

Yes, the LTC5577IUF#TRPBF supports both high-side and low-side LO injection across its full 300–6000 MHz RF/LO range. Performance data-including conversion gain, IIP3, and NF-is specified separately for each configuration (e.g., +0.5 dB gain and +30.2 dBm IIP3 at 1900 MHz with low-side LO). External matching networks must be selected per Table in datasheet Figure 1.

How does the TEMP pin (Pin 12) function in the LTC5577IUF#TRPBF, and what accuracy can be expected?

The TEMP pin on the LTC5577IUF#TRPBF connects to an on-die diode anode. When biased with a constant current (e.g., 10 µA), its forward voltage drops linearly with junction temperature at –1.75 mV/°C. At 25°C, voltage is 716 mV; accuracy is ±1.5°C over –40°C to 105°C after two-point calibration. This enables real-time thermal derating of PA bias or gain control loops.

Can the LTC5577IUF#TRPBF operate with a 2.5 V supply instead of the nominal 3.3 V?

No-the LTC5577IUF#TRPBF is specified for 3.0–3.6 V operation only. Supply voltage below 3.0 V violates Absolute Maximum Ratings and causes degraded conversion gain, reduced IIP3, and unstable bias conditions. The datasheet specifies 3.3 V typical supply; operation at 2.5 V is not characterized and risks functional failure or parametric shift beyond spec limits.

What is the purpose of the IADJ pin (Pin 8) on the LTC5577IUF#TRPBF, and how does it affect performance?

The IADJ pin on the LTC5577IUF#TRPBF allows adjustment of the mixer core DC bias current. Leaving it open-circuit delivers full performance (180 mA total supply current, +30.2 dBm IIP3). Connecting a resistor to ground reduces current-and thus power dissipation-but trades off IIP3 and P1dB (e.g., 10 kΩ lowers current by ~20 mA and reduces IIP3 by ~1.5 dB). It is not intended for dynamic control.