Analog Devices Inc. LTC2239CUH#PBF

Overview

LTC2239CUH#PBF from Analog Devices (formerly Linear Technology) is a 10-bit, 80 Msps low-noise 3V analog-to-digital converter optimized for high-frequency, wide-dynamic-range signal digitization in imaging and communications systems. It delivers 61.6 dB SNR at 70 MHz input, 85 dB SFDR, ±0.1 LSB typical INL/DNL, and operates from a single 2.7 V to 3.4 V supply with 211 mW power consumption.

For engineers reviewing the LTC2239CUH#PBF datasheet, LTC2239CUH#PBF pinout, LTC2239CUH#PBF application, or LTC2239CUH#PBF equivalent, key selection criteria include its 575 MHz full-power bandwidth, clock duty cycle stabilizer, flexible 1 V_P-P to 2 V_P-P input range, and QFN-32 package compatibility with pin-compatible family members like LTC2229 and LTC2251.

Technical Context

The LTC2239CUH#PBF implements a six-stage CMOS pipelined ADC architecture with 5-cycle latency and integrated sample-and-hold featuring 575 MHz full-power bandwidth. Its correction logic compensates for stage residue errors, enabling no missing codes and low transition noise (0.08 LSB_RMS).

It supports differential or single-ended analog inputs with programmable common-mode bias via the VCM pin (1.5 V output), configurable input range (±0.5 V or ±1 V) via SENSE pin, and flexible digital output interface with independent OVDD (0.5 V–3.6 V) for logic-level compatibility.

Key Specifications

Pinout & Package

The LTC2239CUH#PBF is housed in a 32-lead (5 mm × 5 mm) plastic QFN package with exposed pad (Pin 33) requiring solder connection to PCB ground for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2229CUH#PBF and AD9226ASTZ, the LTC2239CUH#PBF uniquely balances 10-bit precision, 80 Msps throughput, 85 dB SFDR, and on-chip features like duty cycle stabilization and programmable input range-making it optimal for wideband communications and portable instrumentation where dynamic range and power efficiency are co-critical.

Availability

LTC2239CUH#PBF is available at Aetrix Electronics and suitable for wireless infrastructure, medical ultrasound imaging, portable test equipment, and spectral analysis instruments requiring stable component supply and long-term production continuity.

Supply support for LTC2239CUH#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 LTC2239CUH#PBF belongs to ADI's high-speed precision ADC product line, engineered specifically for demanding wideband digitization in communications and imaging systems where low jitter, high SFDR, and flexible power management are essential.

FAQ

What is the operating temperature range for the LTC2239CUH#PBF?

The LTC2239CUH#PBF is specified for commercial temperature operation from 0°C to 70°C. This grade is validated for use in non-automotive, non-military environments such as base station radios, lab instruments, and portable medical devices where ambient conditions remain within this range. The 'C' suffix explicitly denotes the 0°C to 70°C grade, distinct from the industrial-grade LTC2239IUH#PBF (–40°C to 85°C).

Does the LTC2239CUH#PBF require an external reference voltage?

No, the LTC2239CUH#PBF integrates a 1.5 V bandgap reference and supports fully self-contained operation using its internal reference. The SENSE pin configures input range (±0.5 V or ±1 V) without external reference components. An external reference may be applied to SENSE only if a custom range between 0.5 V and 1 V is needed, but it is not required for standard operation of the LTC2239CUH#PBF.

How does the clock duty cycle stabilizer in the LTC2239CUH#PBF improve system design?

The clock duty cycle stabilizer in the LTC2239CUH#PBF allows reliable 80 Msps operation with input clock duty cycles from 40% to 60%, relaxing timing constraints on clock generation circuits. This eliminates the need for dedicated duty cycle correction ICs or precision clock buffers, reducing bill-of-materials cost and board area while maintaining full AC performance - a key advantage over alternatives like AD9226ASTZ that lack this feature.

What is the purpose of the VCM pin on the LTC2239CUH#PBF?

The VCM pin on the LTC2239CUH#PBF provides a buffered 1.5 V output used to bias differential analog input drivers or transformer center taps. It ensures precise common-mode voltage alignment for AIN+ and AIN−, critical for minimizing even-order harmonics and maximizing SFDR. The pin must be bypassed with ≥2.2 µF ceramic capacitance close to the device to maintain stability and noise immunity in the LTC2239CUH#PBF.

Can the LTC2239CUH#PBF interface directly with 1.8 V FPGA I/O banks?

Yes, the LTC2239CUH#PBF supports direct interface with 1.8 V FPGA I/O banks via its independent OVDD supply pin. When OVDD = 1.8 V, the D0–D9 outputs meet 1.8 V logic thresholds (VOH ≥ 1.79 V, VOL ≤ 0.09 V at 1.6 mA), enabling seamless connection without level shifters. This capability is confirmed in the Digital Outputs section of the LTC2239CUH#PBF datasheet under OVDD = 1.8 V conditions.