Analog Devices Inc. LTC2250CUH#PBF

Overview

LTC2250CUH#PBF from Analog Devices (formerly Linear Technology) is a 10-bit, 105 Msps low-noise pipelined analog-to-digital converter operating from a single 3V supply (2.85V–3.4V), delivering 61.6 dB SNR and 85 dB SFDR at 70 MHz input frequency. It features a 640 MHz full-power bandwidth sample-and-hold, clock duty cycle stabilizer, and flexible ±0.5 V to ±1 V differential input range - deployed in ultrasound imaging front-ends and spectral analysis systems requiring high dynamic range digitization.

For engineers reviewing the LTC2250CUH#PBF datasheet, LTC2250CUH#PBF pinout, LTC2250CUH#PBF application, or LTC2250CUH#PBF equivalent, key selection criteria include sampling rate tolerance (105 Msps), SNR/SFDR trade-offs across input frequencies, output driver voltage compatibility (0.5V–3.6V), shutdown/napping power states (2 mW / 15 mW), and QFN-32 package thermal management with exposed ground pad soldering.

Technical Context

The LTC2250CUH#PBF implements a six-stage CMOS pipelined ADC architecture with 5-cycle pipeline latency and integrated correction logic to ensure no missing codes. Its sample-and-hold uses 3.5 pF sampling capacitors and supports both differential and single-ended drive, with aperture jitter specified at 0.2 psRMS.

It integrates a programmable internal 1.5 V reference (±25 ppm/°C tempco), configurable input range via SENSE pin (±0.5 V to ±1 V), and dual-mode output format (offset binary or 2's complement) selected by MODE pin voltage level - all synchronized to a single-ended CLK input with duty cycle stabilization enabled or disabled per application timing constraints.

Key Specifications

Pinout & Package

Package: 32-lead (5 mm × 5 mm) plastic QFN with exposed thermal pad (Pin 33 = GND), requiring PCB soldering 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 AD9215BRUZ-105 and LTC2252CUH#PBF, the LTC2250CUH#PBF offers the lowest system-level power (320 mW), built-in clock duty cycle stabilization, and integrated 1.5 V reference - making it optimal for thermally constrained, cost-sensitive, or clock-flexible designs where 10-bit resolution suffices.

Availability

LTC2250CUH#PBF is available at Aetrix Electronics and suitable for ultrasound imaging front-ends, portable spectral analyzers, communications test equipment, and high-speed data acquisition modules requiring stable component supply and long-term production continuity.

Supply support for LTC2250CUH#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 LTC2250CUH#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for demanding digitization tasks in medical imaging, test & measurement, and broadband communications where low noise, high SFDR, and flexible power management are essential.

FAQ

What is the maximum input frequency supported by the LTC2250CUH#PBF before signal attenuation exceeds 3 dB?

The LTC2250CUH#PBF has a full-power bandwidth of 640 MHz, meaning its analog input path maintains ≤3 dB attenuation up to that frequency for a full-scale input signal. This specification is measured using the Figure 8 test circuit in the datasheet and enables direct sampling of L-band RF signals without external anti-alias filtering in many applications.

Does the LTC2250CUH#PBF require external reference components, or is the reference fully integrated?

The LTC2250CUH#PBF integrates a precision 1.5 V bandgap reference with ±25 ppm/°C tempco and 3 mV/V line regulation. No external reference IC is needed - only proper bypassing of the VCM pin with ≥2.2 µF and the REFH/REFL pins with 0.1 µF + 2.2 µF capacitors is required to achieve specified SNR and SFDR performance.

How does the MODE pin configure output format and clock duty cycle stabilization on the LTC2250CUH#PBF?

The MODE pin on the LTC2250CUH#PBF selects both output coding and clock stabilization: GND = 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 dual-function pin reduces external control lines while maintaining configurability for timing-critical systems.

Can the LTC2250CUH#PBF operate with a 1.8 V OVDD supply for interfacing with low-voltage FPGAs?

Yes, the LTC2250CUH#PBF supports OVDD from 0.5 V to 3.6 V. At OVDD = 1.8 V, VOH is guaranteed ≥1.79 V and VOL ≤0.09 V under 1.6 mA load, ensuring reliable LVCMOS18-compatible signaling. This allows direct connection to Xilinx Artix-7 or Intel Cyclone V FPGA I/O banks without level-shifting circuitry.

What thermal considerations apply to the exposed pad (Pin 33) of the LTC2250CUH#PBF QFN package?

The exposed pad (Pin 33) of the LTC2250CUH#PBF is electrically and thermally connected to GND. It must be soldered to a dedicated PCB copper pour tied to the system ground plane. Thermal resistance θ_JA is specified at 34°C/W only when the pad is properly soldered - omitting this step increases junction temperature by >25°C at full power, risking parametric drift or reliability degradation.