Analog Devices Inc. LTC2272IUJ#PBF

Overview

LTC2272IUJ#PBF from Analog Devices (acquired Linear Technology) is a 16-bit, 65Msps high-speed serial-output analog-to-digital converter with JESD204 interface, 700MHz full-power bandwidth, ±4.5LSB INL, and 100dB spurious-free dynamic range (SFDR). It digitizes wideband RF/IF signals in cellular base station receivers and spectrum analyzers using a PGA front end and ultra-low 80fs RMS jitter sampling clock.

For engineers reviewing the LTC2272IUJ#PBF datasheet, LTC2272IUJ#PBF pinout, LTC2272IUJ#PBF application, or LTC2272IUJ#PBF equivalent, key selection criteria include JESD204 serial output compliance, 65Msps sample rate at –40°C to +85°C, 1.5VP-P/2.25VP-P input range configurability, and 40-pin 6mm × 6mm QFN package thermal performance.

Technical Context

The LTC2272IUJ#PBF implements a pipelined ADC core with integrated 8B/10B serializer and clock duty cycle stabilizer, supporting JEDEC JESD204A-compliant 20-bit serial data transmission at 1.3Gbps (65Msps × 20 bits). Its analog front end includes a programmable gain amplifier (PGA) for 1.5VP-P or 2.25VP-P differential input ranges and internal dither control via DITH pin.

Timing is governed by differential ENC+/ENC– encode inputs accepting PECL/LVDS/TTL/CMOS, with pipeline latency of 9 cycles and SYNC-controlled frame alignment. The device uses separate analog (VDD = 3.3V) and output (OVDD = 1.2V–3.3V) supplies, with CMLOUT+/- CML outputs directly coupled to 50Ω or AC-coupled to FPGA/ASIC receivers.

Key Specifications

Pinout & Package

40-lead 6mm × 6mm plastic QFN (UJ package) with exposed thermal pad (Pin 41 = GND). Requires soldering exposed pad 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 AD9268BCPZ-65 and LTC2274IUJ#PBF, the LTC2272IUJ#PBF offers optimal balance of JESD204A compatibility, 65Msps performance, and thermal efficiency in industrial temperature-grade QFN packaging.

Availability

LTC2272IUJ#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, test equipment, and medical imaging systems requiring stable component supply across extended temperature ranges.

Supply support for LTC2272IUJ#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 LTC2272IUJ#PBF belongs to ADI's high-speed data converter product line, designed specifically for demanding RF/IF digitization in wireless infrastructure and instrumentation where JESD204 serial interface, low jitter, and wide input bandwidth are critical.

FAQ

What is the operating temperature range for the LTC2272IUJ#PBF?

The LTC2272IUJ#PBF is rated for industrial operation from –40°C to +85°C, as indicated by the "I" grade suffix in the part number. This makes it suitable for base station outdoor units, portable test equipment, and other environments where ambient temperatures exceed commercial grade limits. The device maintains full DC and AC specifications across this range, including ±4.5LSB INL and 100dB SFDR.

Does the LTC2272IUJ#PBF support JESD204A or JESD204B?

The LTC2272IUJ#PBF implements the JESD204A standard, not JESD204B. It transmits serialized 16-bit data plus 4-bit overhead (20-bit total) at 1.3Gbps (65Msps × 20 bits) over a single CML lane. JESD204A lacks subclass 1 deterministic latency features found in JESD204B, so system-level synchronization relies on SYNC+/- framing rather than SYSREF. FPGA receiver IP must be configured for JESD204A link layer.

How does the PGA function affect input range on the LTC2272IUJ#PBF?

The PGA on the LTC2272IUJ#PBF selects between two differential input voltage ranges: 1.5VP-P (PGA = high) or 2.25VP-P (PGA = low). This setting adjusts the front-end gain to match signal amplitude, optimizing SNR and headroom. For example, a low-level 100mVP-P IF signal benefits from PGA = high to maximize utilization of the 16-bit code space, while a high-level 2VP-P signal uses PGA = low to avoid clipping.

What is the purpose of the SRR0 and SRR1 pins on the LTC2272IUJ#PBF?

The SRR0 and SRR1 pins on the LTC2272IUJ#PBF configure the internal sample rate range for the clock duty cycle stabilizer, ensuring optimal performance across 20–65Msps. These pins set bias currents and loop bandwidths in the stabilizer circuit to maintain <10% duty cycle error even with highly asymmetric encode clocks. They do not change the actual sample rate - that is determined solely by the ENC+/ENC– frequency - but enable robust operation with non-50% duty cycle sources.

Can the LTC2272IUJ#PBF operate with a single-ended encode clock?

Yes, the LTC2272IUJ#PBF supports single-ended encode clock operation on ENC+ (Pin 9) with ENC– (Pin 10) bypassed to GND via 0.1μF capacitor. The internal 6.2kΩ bias resistor on ENC+ sets the common-mode voltage to 1.6V, allowing TTL/CMOS logic levels (0V/3.3V) to drive the input. However, differential drive (LVDS/PECL) is recommended for best jitter performance and noise immunity, especially at full 65Msps rate.