Analog Devices Inc. LTC2222CUK-11#PBF

Overview

LTC2222CUK-11#PBF from Analog Devices (formerly Linear Technology) is an 11-bit, 105 Msps pipelined analog-to-digital converter optimized for high-frequency communication signal digitization. It delivers 65.4 dB SNR at 140 MHz input, 80 dB SFDR up to 150 MHz, and 775 MHz full-power bandwidth, with ultralow 0.15 ps_RMS aperture jitter - enabling undersampling of IF signals in wireless infrastructure and test equipment.

For engineers reviewing the LTC2222CUK-11#PBF datasheet, LTC2222CUK-11#PBF pinout, LTC2222CUK-11#PBF application, or LTC2222CUK-11#PBF equivalent, key selection criteria include differential input support (±0.5 V / ±1 V ranges), CMOS output flexibility (0.5–3.3 V OVDD), clock duty cycle stabilization, and low-power 475 mW operation at 3.3 V - all in a thermally enhanced 48-pin 7 mm × 7 mm QFN package.

Technical Context

The LTC2222CUK-11#PBF implements a five-stage CMOS pipelined ADC architecture with digital correction logic, delivering 11-bit resolution without missing codes across 0°C to 70°C. Its sample-and-hold features 775 MHz full-power bandwidth and 0.15 ps_RMS jitter, supporting undersampling of IF signals up to 250 MHz while maintaining 64.9 dB SNR and 77 dB SFDR.

It accepts differential or single-ended encode inputs (ENC+/ENC–), supports flexible reference configuration via SENSE and VCM pins, and provides selectable output formats (offset binary or 2's complement) and clock duty cycle stabilization via MODE pin - all controlled through dedicated logic inputs (SHDN, OE, OF) with pipeline latency of exactly 5 cycles.

Key Specifications

Pinout & Package

Package: 48-lead plastic QFN (7 mm × 7 mm), exposed pad (Pin 49) soldered to PCB ground for thermal and electrical integrity. Pin pitch: 0.5 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2232CUK-11#PBF and AD9230BCPZ-105, the LTC2222CUK-11#PBF uniquely balances 11-bit precision, 475 mW power, parallel CMOS outputs, and robust undersampling capability - making it optimal for space-constrained, thermally sensitive IF digitization where pin-compatible upgrade paths exist within the LTC22xx family.

Availability

LTC2222CUK-11#PBF is available at Aetrix Electronics and suitable for wireless infrastructure base stations, cable head-end systems, and communications test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC2222CUK-11#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and RF ICs, serving precision instrumentation, communications, and industrial markets.

The LTC2222CUK-11#PBF belongs to the LTC22xx family of ultra-low-jitter, high-SFDR pipeline ADCs designed specifically for demanding communications signal acquisition - emphasizing undersampling fidelity, thermal stability, and flexible interface integration.

FAQ

What is the operating temperature range for the LTC2222CUK-11#PBF?

The LTC2222CUK-11#PBF is rated for commercial temperature operation from 0°C to 70°C (C-grade). This is confirmed by the "C" suffix in the part marking and specified in the Absolute Maximum Ratings table. The device achieves ±0.15 LSB INL and 65.4 dB SNR across this full range, with internal reference tempco limited to ±25 ppm/°C - ensuring stable performance in fan-cooled base station cards and lab-grade test instruments.

Does the LTC2222CUK-11#PBF support single-ended analog input?

Yes, the LTC2222CUK-11#PBF supports single-ended analog input: connect AIN+ to the signal and AIN– to VCM (1.6 V). However, harmonic distortion (especially 2nd order) and INL degrade relative to differential drive - while SNR and DNL remain unchanged. The datasheet explicitly states this trade-off and recommends differential drive for optimal SFDR and linearity in communications applications.

How does the MODE pin configure output format and clock stabilization on the LTC2222CUK-11#PBF?

The MODE pin on the LTC2222CUK-11#PBF selects both output coding and duty cycle stabilization: grounded → 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 is documented in the Pin Functions section (Page 9) and enables one-pin optimization of timing robustness versus data format compatibility with downstream logic.

What is the purpose of the CLOCKOUT signal on the LTC2222CUK-11#PBF?

The CLOCKOUT signal on the LTC2222CUK-11#PBF is a data-valid strobe synchronized to the internal pipeline - its falling edge marks the instant when D0–D10 outputs are stable and ready for latching. With guaranteed skew of –0.6 to 0 ns relative to data, CLOCKOUT enables zero-setup/hold FPGA capture without external delay tuning, reducing timing closure effort in high-speed digital interfaces.

Can the LTC2222CUK-11#PBF use an external reference voltage?

Yes, the LTC2222CUK-11#PBF supports external reference via the SENSE pin: applying an external voltage between 0.5 V and 1.0 V to SENSE sets the input range to ±V_SENSE. The device also accepts external references directly at REFHA/REFHB and REFLA/REFLB pins per the reference circuitry diagram (Figure 9). External reference use maintains ±0.15 LSB INL but requires careful layout to avoid noise coupling into the high-impedance reference nodes.