Analog Devices Inc. LTC2188CUP#PBF

Overview

LTC2188CUP#PBF from Analog Devices (acquired Linear Technology) is a dual-channel, simultaneous-sampling 16-bit analog-to-digital converter optimized for high-frequency, wide-dynamic-range signal digitization in communications systems. It delivers 77dB SNR, 90dB SFDR, and ultralow 0.07psRMS jitter at 20Msps sampling rate, operating from a single 1.8V supply with 76mW total power consumption. Its primary circuit role is IF/RF digitization in software-defined radios and base station receivers.

For engineers reviewing the LTC2188CUP#PBF datasheet, LTC2188CUP#PBF pinout, LTC2188CUP#PBF application, or LTC2188CUP#PBF equivalent, key selection considerations include its dual-channel simultaneity, DDR LVDS/CMOS output flexibility, 550MHz full-power bandwidth, selectable 1–2VP-P input range, and SPI-configurable clock duty cycle stabilizer and data randomizer.

Technical Context

The LTC2188CUP#PBF employs a shared encode circuit enabling true simultaneous sampling across two 16-bit ADC cores, each with a 550MHz sample-and-hold bandwidth and ±2LSB INL (typ). Its architecture supports differential or single-ended encode inputs and configurable output modes-full-rate CMOS, DDR CMOS, or DDR LVDS-with separate OVDD supply for output voltage scaling.

Digital interface control is implemented via a serial SPI port managing mode registers for features including clock duty cycle stabilization, data output randomization, and shutdown/nap modes. The device integrates internal 1.25V reference with ±25ppm/°C drift and supports external reference via the SENSE pin for programmable input ranges.

Key Specifications

Pinout & Package

Package: 64-lead (9mm × 9mm) plastic QFN with exposed thermal pad (Pin 65 = GND), rated for 0°C to 70°C operation (C-grade).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, 16-bit, 20Msps ADC applications.

Compared with AD9268BCPZ-20 and ADS52J90IRGCT, the LTC2188CUP#PBF offers superior jitter-limited SNR at lower power and unique on-chip clock conditioning, making it optimal for space-constrained, mixed-signal SDR and portable imaging platforms where analog interface simplicity and deterministic latency are critical.

Availability

LTC2188CUP#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, software-defined radio development, and portable medical imaging systems requiring stable component supply across extended production lifecycles.

Supply support for LTC2188CUP#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 LTC2188CUP#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for demanding communications and instrumentation applications requiring simultaneous dual-channel sampling, low power, and flexible digital interfacing.

FAQ

What is the operating temperature range for the LTC2188CUP#PBF?

The LTC2188CUP#PBF is specified for commercial temperature operation from 0°C to 70°C. This C-grade variant is intended for indoor, controlled-environment applications such as baseband processing boards and laboratory test equipment where ambient thermal conditions remain within this range. Its thermal design uses an exposed pad (Pin 65) soldered directly to PCB ground for effective heat dissipation at 76mW total power.

Does the LTC2188CUP#PBF support both differential and single-ended analog inputs?

Yes, the LTC2188CUP#PBF supports differential analog inputs by default on AIN1+/AIN1– and AIN2+/AIN2–, biased by VCM1/VCM2 outputs. It also permits single-ended drive on AIN1+ (with AIN1– tied to VCM1) for lower harmonic distortion sensitivity, though this degrades INL and SFDR. Input common-mode range is 0.7V to 1.25V, and full-scale range is selectable from 1VP-P to 2VP-P via the SENSE pin configuration.

How does the DDR LVDS output mode reduce system noise compared to CMOS outputs on the LTC2188CUP#PBF?

The DDR LVDS output mode on the LTC2188CUP#PBF reduces system noise by using current-mode differential signaling with 350mV typical differential swing and on-chip 100Ω termination, minimizing EMI radiation and ground bounce. Unlike CMOS outputs that switch rail-to-rail with high di/dt, LVDS transitions are small-swing and complementary, resulting in near-zero net current change on power rails - critical for preserving analog signal integrity in mixed-signal PCB layouts.

Can the LTC2188CUP#PBF be configured for independent channel operation or only simultaneous sampling?

The LTC2188CUP#PBF is architecturally designed for simultaneous sampling only - both channels share a single encode circuit and sample on the same clock edge, ensuring deterministic inter-channel phase alignment with zero skew. There is no provision for independent sampling timing or asynchronous channel operation; this fixed simultaneity is essential for I/Q demodulation, beamforming, and coherent multi-sensor acquisition where phase coherence is mandatory.

What SPI configuration capabilities does the LTC2188CUP#PBF provide beyond basic mode selection?

The LTC2188CUP#PBF SPI interface configures not only output format (CMOS/LVDS, DDR/full-rate) and power modes (nap/sleep), but also enables advanced features including clock duty cycle stabilization, data output randomization to suppress spectral tones, and programmable CLKOUT phase delay for timing alignment with FPGA capture logic. All settings are stored in internal mode control registers accessible via 8-bit address/data writes through the CS/SCK/SDI/SDO interface.