Analog Devices Inc. LTC2185IUP#PBF

Overview

LTC2185IUP#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, dual-channel, simultaneous-sampling analog-to-digital converter with 125Msps sampling rate, 76.8dB SNR, and 90dB SFDR. It operates from a single 1.8V supply, supports CMOS/DDR CMOS/DDR LVDS outputs, and targets high-fidelity signal digitization in communications infrastructure and portable medical imaging systems.

For engineers reviewing the LTC2185IUP#PBF datasheet, LTC2185IUP#PBF pinout, LTC2185IUP#PBF application, or LTC2185IUP#PBF equivalent, key selection criteria include its 550MHz full-power bandwidth, ultralow 0.07psRMS jitter, ±2LSB INL, 1.8V single-supply operation, and configurable output interface modes for system-level timing and power optimization.

Technical Context

The LTC2185IUP#PBF implements two independent 16-bit ADC cores sharing a common sample-and-hold with 550MHz bandwidth and 0.07psRMS acquisition jitter-enabling undersampling of IF signals up to 140MHz while maintaining 76.8dB SNR. Its dual-channel architecture ensures precise channel-to-channel matching (±0.3%FS gain, ±1.5mV offset).

Digital interface flexibility includes full-rate CMOS, DDR CMOS, or DDR LVDS outputs with separate OVDD supply (1.2V–1.8V), selectable input ranges (1VP-P to 2VP-P), and optional clock duty cycle stabilizer for robust timing under variable clock conditions.

Key Specifications

Pinout & Package

64-pin (9mm × 9mm) plastic QFN package with exposed thermal pad (Pin 65 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, high-speed ADC applications.

Compared with AD9286BCPZ-125 and ADS52J90IRGCT, the LTC2185IUP#PBF uniquely balances 16-bit resolution, true simultaneous dual sampling, ultra-low jitter, and multiple output interface options in a thermally efficient 9mm QFN-making it optimal for compact, high-fidelity RF digitization where channel coherence and power are critical.

Availability

LTC2185IUP#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, portable medical imaging, and software-defined radio applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LTC2185IUP#PBF 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 LTC2185IUP#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for demanding communications and instrumentation applications requiring simultaneous dual-channel sampling, low jitter, and flexible digital interfacing.

FAQ

What is the operating temperature range for the LTC2185IUP#PBF?

The LTC2185IUP#PBF is rated for –40°C to +85°C industrial temperature operation, as indicated by the "I" grade suffix in the part number. This range is validated across all key specifications including SNR, SFDR, INL, and power consumption-ensuring reliable performance in base station outdoor units and portable medical devices.

Does the LTC2185IUP#PBF support single-ended analog inputs?

The LTC2185IUP#PBF supports differential analog inputs by design (AIN1+/AIN1–, AIN2+/AIN2–), but single-ended drive is possible using the common-mode bias outputs (VCM1/VCM2) to establish mid-supply reference. Direct single-ended input without biasing violates the specified input common-mode range and degrades performance-so VCM-based biasing is required for non-differential sources.

Can the LTC2185IUP#PBF operate with a 1.2V OVDD supply for CMOS outputs?

Yes, the LTC2185IUP#PBF supports OVDD from 1.1V to 1.9V, including 1.2V for CMOS output mode. At 1.2V OVDD, VOH is 1.185V and VOL is 0.010V (IO = ±500µA), enabling direct interfacing with 1.2V FPGA I/O banks while reducing switching power by ~30% versus 1.8V operation.

How does the clock duty cycle stabilizer affect timing in the LTC2185IUP#PBF?

The clock duty cycle stabilizer in the LTC2185IUP#PBF corrects asymmetric encode clocks (e.g., 30%/70% duty cycle) to near 50% before sampling, ensuring consistent aperture time and minimizing harmonic distortion. When enabled, tL and tH increase slightly (e.g., from 3.8ns to 4.76ns min), but SNR and SFDR remain stable across wide duty cycle variations-critical for systems using non-ideal clock sources.

Is the LTC2185IUP#PBF pin-compatible with other members of the LTC218x family?

Yes, the LTC2185IUP#PBF shares identical 64-pin QFN packaging, pinout, and footprint with LTC2184IUP#PBF and LTC2183IUP#PBF. All three variants are hardware-compatible and differ only in maximum sampling rate (125/105/80Msps) and corresponding power/performance trade-offs-enabling drop-in upgrades or downgrades within the same PCB design.