Analog Devices Inc. LTC2269IUK#TRPBF

Overview

LTC2269IUK#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 20Msps low-noise analog-to-digital converter optimized for high-dynamic-range signal digitization in communications systems. It delivers 84.1dB SNR, 99dB SFDR, ±1LSB typical INL, single 1.8V supply operation, and supports CMOS/DDR-CMOS/DDR-LVDS digital outputs - enabling direct interface with FPGAs in software-defined radio front ends.

For engineers reviewing the LTC2269IUK#TRPBF datasheet, LTC2269IUK#TRPBF pinout, LTC2269IUK#TRPBF application, or LTC2269IUK#TRPBF equivalent, key selection criteria include its –40°C to +85°C industrial temperature grade, 200MHz full-power bandwidth, 1.44LSB_RMS transition noise, programmable input range (1.0V_P-P to 2.1V_P-P), and SPI-configurable output modes for noise-sensitive embedded data acquisition.

Technical Context

The LTC2269IUK#TRPBF employs a differential sample-and-hold architecture with internal 1.25V reference and VCM bias output (nominally VDD/2) to support precise common-mode control of analog inputs. Its encode interface accepts differential (LVDS/PECL) or single-ended (TTL/CMOS) clocks, with an optional duty-cycle stabilizer ensuring full-speed performance across wide clock asymmetry.

Digital output flexibility includes three selectable modes: full-rate CMOS (16 single-ended lines), DDR-CMOS (8 lines), or DDR-LVDS (8 differential pairs), all configurable via a serial SPI port. Power management includes Nap (10mW) and Sleep (0.5mW) modes, while dynamic accuracy is maintained over temperature via ±2.3LSB max INL and 82.1–84.1dB SNR across 1.4–70MHz input frequencies.

Key Specifications

Pinout & Package

48-lead (7mm × 7mm) plastic QFN package with exposed thermal pad (Pin 49 = GND). Pin functions are mode-dependent; core analog/digital control pins remain fixed across output configurations.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9269BCPZ-20 and LTC2274IUK#TRPBF, the LTC2269IUK#TRPBF provides optimal balance of low power, parallel interface simplicity, and industrial temperature reliability - making it preferred for cost-sensitive, thermally constrained, FPGA-based SDR and portable medical systems where JESD204B or >20Msps are unnecessary.

Availability

LTC2269IUK#TRPBF is available at Aetrix Electronics and suitable for software defined radios, portable medical imaging, and multichannel data acquisition systems requiring stable component supply, long-term industrial temperature support, and consistent parametric performance across production lots.

Supply support for LTC2269IUK#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 digital signal processing semiconductors.

The LTC2269IUK#TRPBF belongs to Linear's ultra-low-noise, high-SFDR ADC product line, designed specifically for demanding communications, instrumentation, and medical imaging applications where dynamic range and power efficiency are critical.

FAQ

What is the operating temperature range of the LTC2269IUK#TRPBF?

The LTC2269IUK#TRPBF is rated for industrial operation from –40°C to +85°C. This is confirmed by the "I" grade designation in the part number and specified in the Absolute Maximum Ratings table. The device maintains full performance - including ±2.3LSB max INL and 82.1dB min SNR - across this entire range, making it suitable for outdoor base stations and ruggedized portable equipment where ambient conditions vary widely.

Does the LTC2269IUK#TRPBF require an external reference voltage?

No, the LTC2269IUK#TRPBF includes an internal 1.25V reference (VREF pin) and supports internal reference operation by tying the SENSE pin to VDD (for 2.1V_P-P range) or GND (for 1.05V_P-P range). An external reference (0.625V–1.3V) can be applied to SENSE for custom input ranges, but it is not required - eliminating the need for external reference ICs in most implementations.

How many pins does the LTC2269IUK#TRPBF use for digital data output in DDR-LVDS mode?

In DDR-LVDS mode, the LTC2269IUK#TRPBF uses 16 pins for data: eight differential pairs (D0_1+, D0_1– through D14_15+, D14_15–) occupying Pins 21/22, 23/24, 25/26, 27/28, 33/34, 35/36, 37/38, and 39/40. Additionally, CLKOUT+/CLKOUT– (Pins 30/29) and OF+/OF– (Pins 42/41) are used, totaling 20 pins for synchronized LVDS data transfer.

Can the LTC2269IUK#TRPBF operate with a single-ended analog input?

No - the LTC2269IUK#TRPBF requires differential analog input (AIN+, AIN–) as stated in the Applications Information section. Its sample-and-hold circuitry is inherently differential, and common-mode rejection (80dB CMRR) depends on balanced drive. Single-ended signals must be converted to differential using an RF transformer or high-speed differential amplifier before connection.

What is the purpose of the PAR/SER pin on the LTC2269IUK#TRPBF?

The PAR/SER pin (Pin 9) selects the programming interface mode: grounded for serial SPI control (CS/SCK/SDI/SDO), or tied to VDD for parallel logic control. It must be hard-wired - not dynamically driven - because configuration latching occurs at power-up. In serial mode, all operating parameters (output format, range, clock stabilization) are set via the SPI port; in parallel mode, only basic functions like output mode and shutdown are accessible.