Analog Devices Inc. LTC2289CUP#PBF

Overview

LTC2289CUP#PBF from Analog Devices (formerly Linear Technology) is a dual 10-bit, 80Msps low-noise 3V analog-to-digital converter optimized for high-frequency signal digitization in imaging and communications systems. It delivers 61.6dB SNR at 70MHz input, 85dB SFDR, and 110dB channel isolation at 100MHz, operating from a single 2.7V–3.4V supply with 422mW total power consumption.

For engineers reviewing the LTC2289CUP#PBF datasheet, LTC2289CUP#PBF pinout, LTC2289CUP#PBF application, or LTC2289CUP#PBF equivalent, key selection factors include dual-channel timing alignment, clock duty cycle stabilization support, flexible ±0.5V/±1V differential input range, multiplexed or independent 10-bit parallel output buses, and QFN-64 thermal performance under continuous 80Msps operation.

Technical Context

The LTC2289CUP#PBF implements a six-stage CMOS pipelined ADC architecture per channel, achieving 5-cycle pipeline latency with deterministic timing. Its sample-and-hold features 575MHz full-power bandwidth and 0.2psRMS aperture jitter, enabling accurate digitization of wideband RF signals beyond Nyquist.

Each channel includes independent reference programming (SENSEA/SENSEB), common-mode bias outputs (VCMA/VCMB), and configurable shutdown/nap modes. The MODE pin selects offset binary or 2's complement output format and enables/disables the integrated clock duty cycle stabilizer-critical for maintaining AC performance with non-50% clock inputs.

Key Specifications

Pinout & Package

Package: 64-lead (9mm × 9mm) plastic QFN with exposed GND pad (Pin 65) requiring PCB soldering for thermal and electrical integrity. θJA = 20°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2288IUP#PBF and AD9233BCPZ-80, the LTC2289CUP#PBF uniquely delivers synchronized dual 10-bit conversion at 80Msps in one QFN-64 package with guaranteed 110dB channel isolation-reducing BOM count, layout effort, and inter-channel timing uncertainty in I/Q and beamforming systems.

Availability

LTC2289CUP#PBF is available at Aetrix Electronics and suitable for wireless infrastructure, medical ultrasound, spectrum analysis, and portable instrumentation requiring stable component supply across industrial temperature ranges (0°C to 70°C).

Supply support for LTC2289CUP#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 semiconductors, serving precision instrumentation, communications, and industrial markets.

The LTC2289CUP#PBF belongs to ADI's high-speed dual ADC product line, engineered specifically for demanding RF and IF digitization where channel matching, low jitter, and flexible power modes are essential for system-level dynamic range and thermal efficiency.

FAQ

What is the operating temperature range for the LTC2289CUP#PBF?

The LTC2289CUP#PBF is rated for 0°C to 70°C ambient operation (C-grade). This is confirmed in the "PACKAGE/ORDER INFORMATION" section of the datasheet, where "LTC2289C" denotes the commercial temperature grade. The part uses the UP (QFN-64) package with exposed pad thermal management, and its DC specs-including ±0.6LSB INL and ±0.5LSB DNL-are guaranteed across this full range.

Does the LTC2289CUP#PBF support independent clocking of its two ADC channels?

Yes, the LTC2289CUP#PBF supports fully independent clocking via dedicated CLKA and CLKB pins. Each channel samples on the rising edge of its respective clock, enabling asynchronous acquisition or phase-shifted sampling. However, for coherent dual-channel operation (e.g., I/Q), synchronous clocking with matched trace lengths is required to maintain <5ps inter-channel skew-verified in timing diagrams and AC performance plots.

How does the MODE pin configure output format and clock stabilization on the LTC2289CUP#PBF?

The MODE pin on the LTC2289CUP#PBF selects both output coding and clock duty cycle stabilizer state: GND = offset binary + stabilizer off; 1V (≈1/3 VDD) = offset binary + stabilizer on; 2V (≈2/3 VDD) = 2's complement + stabilizer on; VDD = 2's complement + stabilizer off. This dual-function control is documented in the "PIN FUNCTIONS" section and validated in timing characterization figures.

Can the LTC2289CUP#PBF operate with a 1.8V OVDD supply for interfacing to low-voltage FPGAs?

Yes, the LTC2289CUP#PBF supports OVDD from 0.5V to 3.6V, including 1.8V. At OVDD = 1.8V, VOH is guaranteed ≥1.79V and VOL ≤0.09V under 1.6mA load-fully compatible with 1.8V LVCMOS FPGA I/O. This is specified in the "DIGITAL INPUTS AND DIGITAL OUTPUTS" table, and power consumption scales linearly with OVDD, reducing IO driver power in battery-operated systems.

What is the purpose of the exposed pad (Pin 65) on the LTC2289CUP#PBF QFN package?

The exposed pad (Pin 65) on the LTC2289CUP#PBF is electrically connected to GND and must be soldered to a PCB thermal pad for both electrical grounding and thermal dissipation. With θJA = 20°C/W, proper pad connection is essential to maintain junction temperature below 125°C at 422mW dissipation. The datasheet explicitly states "EXPOSED PAD (PIN 65) IS GND AND MUST BE SOLDERED TO PCB" in the package drawing.