Analog Devices Inc. LTC2224IUK#TRPBF

Overview

LTC2224IUK#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 135Msps pipelined analog-to-digital converter optimized for high-frequency signal digitization in communications infrastructure. It delivers 67.3dB SNR at 140MHz input, 80dB SFDR up to 150MHz, and 775MHz full-power bandwidth with ultralow 0.15psRMS aperture jitter - enabling undersampling of IF signals in cable head-end and wireless baseband systems.

For engineers reviewing the LTC2224IUK#TRPBF datasheet, LTC2224IUK#TRPBF pinout, LTC2224IUK#TRPBF application, or LTC2224IUK#TRPBF equivalent, key selection criteria include its ±0.5V/±1V selectable input range, CMOS output swing (0.5V–3.6V), shutdown/nap modes, duty cycle stabilizer, and guaranteed no missing codes across –40°C to +85°C operation.

Technical Context

The LTC2224IUK#TRPBF employs a five-stage CMOS pipelined ADC architecture with integrated sample-and-hold, correction logic, and flexible reference control. Its differential analog input (AIN+/AIN–) supports ±0.5V or ±1V ranges via SENSE pin configuration, while ENC+/ENC– accepts PECL/LVDS/TTL/CMOS clock inputs with optional duty cycle stabilization.

It features separate analog (VDD = 3.3V) and digital output (OVDD = 0.5–3.6V) supplies, 12-bit offset binary or 2's complement output formatting via MODE pin, and pipeline latency of exactly 5 conversion cycles. DC accuracy includes ±0.4LSB INL and ±0.3LSB DNL (typ) over temperature, with transition noise of 0.5LSBRMS.

Key Specifications

Pinout & Package

Package: 48-lead 7mm × 7mm plastic QFN with exposed pad (GND, Pin 49), requiring soldering to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9230-135EBZ and LTC2222IUK#TRPBF, the LTC2224IUK#TRPBF uniquely maintains 67.3dB SNR up to 140MHz while retaining pin compatibility with lower-speed family members - making it optimal for scalable, high-dynamic-range receiver designs requiring consistent layout reuse.

Availability

LTC2224IUK#TRPBF is available at Aetrix Electronics and suitable for cable head-end systems, wireless infrastructure equipment, and communications test instrumentation requiring stable component supply, long-term industrial-grade availability, and traceable sourcing.

Supply support for LTC2224IUK#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 DSP technologies, serving precision instrumentation, communications, and industrial markets.

The LTC2224IUK#TRPBF belongs to Linear's high-speed ADC product line, engineered specifically for demanding RF/IF digitization in broadband communications infrastructure where dynamic range, jitter, and thermal stability are non-negotiable.

FAQ

What is the operating temperature range for the LTC2224IUK#TRPBF?

The LTC2224IUK#TRPBF is rated for industrial operation from –40°C to +85°C. This specification is verified across all AC and DC parameters including SNR, SFDR, INL, and DNL, making it suitable for outdoor cable head-end cabinets and uncooled base station enclosures where ambient temperatures exceed commercial-grade limits.

Does the LTC2224IUK#TRPBF support single-ended analog input?

Yes, the LTC2224IUK#TRPBF supports single-ended analog input: drive AIN+ with the signal and tie AIN– to VCM (1.6V). However, this configuration degrades harmonic distortion and INL performance versus differential drive - SNR and DNL remain unaffected. For optimal SFDR, differential input is strongly recommended.

How does the MODE pin configure output format and clock stabilization on the LTC2224IUK#TRPBF?

The MODE pin on the LTC2224IUK#TRPBF selects both output format and clock duty cycle stabilizer state via voltage level: 0V → offset binary + stabilizer off; 1/3 VDD → offset binary + stabilizer on; 2/3 VDD → 2's complement + stabilizer on; VDD → 2's complement + stabilizer off. This eliminates external logic for format selection.

What is the purpose of the CLOCKOUT signal on the LTC2224IUK#TRPBF?

The CLOCKOUT signal on the LTC2224IUK#TRPBF is a data-valid strobe synchronized to internal pipeline timing. Its falling edge indicates that D0–D11 outputs contain valid data from the current conversion cycle. Skew between CLOCKOUT and data is controlled to ±0.6ns, enabling reliable capture by FPGA or ASIC logic without additional deskew circuitry.

Can the LTC2224IUK#TRPBF interface directly with 1.8V FPGA I/O banks?

Yes, the LTC2224IUK#TRPBF supports direct interfacing with 1.8V FPGA I/O banks by setting OVDD = 1.8V. Output VOH is guaranteed ≥1.79V and VOL ≤0.09V at 1.6mA sink/source, meeting LVCMOS18 voltage thresholds. OGND must be tied to the FPGA's I/O ground plane for signal integrity.