Analog Devices Inc. LTC2143CUP-14

Overview

LTC2143CUP-14 from Analog Devices (formerly Linear Technology) is a 14-bit, 80Msps dual-channel simultaneous-sampling analog-to-digital converter optimized for high-dynamic-range signal digitization in communications and instrumentation. It delivers 72.9dB SNR, 90dB SFDR, 750MHz full-power bandwidth, ±1LSB INL (typ), and operates from a single 1.8V supply with 113mW total power consumption. It serves as the front-end ADC in portable medical imaging and multi-channel data acquisition systems.

For engineers reviewing the LTC2143CUP-14 datasheet, LTC2143CUP-14 pinout, LTC2143CUP-14 application, or LTC2143CUP-14 equivalent, key selection criteria include its 80Msps sampling rate, dual-channel simultaneity, CMOS/DDR CMOS/DDR LVDS output flexibility, 1.8V single-supply operation, and support for 1VP-P to 2VP-P selectable input ranges - all in a 64-pin QFN package.

Technical Context

The LTC2143CUP-14 implements two independent 14-bit SAR-based ADC cores with shared clocking and synchronized sample-and-hold circuits, enabling true simultaneous sampling across channels. Its ultralow 0.10psRMS jitter (differential encode) supports undersampling of IF signals up to 140MHz while maintaining 72.9dB SNR at 70MHz input.

Digital interface options include full-rate CMOS, DDR CMOS, or DDR LVDS outputs, with separate OVDD supply (1.1–1.9V) allowing output swing control. Configuration is managed via a serial SPI port or parallel logic inputs, and features include optional clock duty cycle stabilizer, data output randomizer, shutdown and nap modes, and internal/external reference selection via the SENSE pin.

Key Specifications

Pinout & Package

64-pin (9mm × 9mm) plastic QFN package with exposed thermal pad (Pin 65 = GND). Requires soldering of 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 dual-channel 14-bit ADC applications.

Compared with AD9253BCPZ-80, LTC2143CUP-14 offers simpler parallel/serial digital interfacing and flexible reference programming, while LTC2263IUJ-80 trades dual-channel capability for lower power and smaller footprint - making LTC2143CUP-14 optimal for phase-coherent dual-sensor systems requiring analog configurability.

Availability

LTC2143CUP-14 is available at Aetrix Electronics and suitable for portable medical imaging, multi-channel data acquisition, and nondestructive testing requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LTC2143CUP-14 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC2143CUP-14 belongs to the LTC214x family of dual-channel, low-power, high-SFDR ADCs designed specifically for demanding communications, instrumentation, and medical imaging applications requiring simultaneous sampling and wide input bandwidth.

FAQ

What is the maximum sampling rate supported by the LTC2143CUP-14?

The LTC2143CUP-14 supports a maximum sampling rate of 80Msps, as specified in its ordering part number suffix and confirmed in the DC and dynamic accuracy specifications tables. This rate applies to both channels simultaneously, with pipeline latency of 6.5 cycles in DDR output modes. Operation above 80Msps is not characterized or guaranteed and may result in degraded SNR or SFDR performance.

Does the LTC2143CUP-14 support differential analog input configurations?

Yes, the LTC2143CUP-14 is designed for differential analog input operation on both channels (AIN1+/AIN1– and AIN2+/AIN2–), with specified performance including 72.9dB SNR and ±1LSB INL under differential drive conditions. Common-mode bias is provided internally via VCM1 and VCM2 pins, and the full 750MHz bandwidth is validated with differential inputs.

How does the SENSE pin affect the input range of the LTC2143CUP-14?

The SENSE pin on the LTC2143CUP-14 directly configures the full-scale input range: tying SENSE to GND selects ±0.5V, to VDD selects ±1V, and applying an external voltage between 0.625V and 1.3V sets a range of ±0.8×V_SENSE. This allows precise matching to sensor output levels without external gain stages, and all configurations maintain the same 14-bit resolution and linearity specs.

Can the LTC2143CUP-14 operate with a 1.2V OVDD supply for CMOS outputs?

Yes, the LTC2143CUP-14 supports OVDD from 1.1V to 1.9V, including 1.2V, for CMOS output modes. At 1.2V OVDD, the VOH is guaranteed ≥1.185V and VOL ≤0.010V under 500μA load, enabling direct interfacing with 1.2V logic families. Output current drive and timing specs remain valid across this range, as confirmed in the Digital Inputs and Outputs section.

What power-saving modes are available on the LTC2143CUP-14, and how much power do they consume?

The LTC2143CUP-14 provides Nap Mode (16mW) and Sleep Mode (1mW), both accessible via SPI register writes or parallel control pins. Nap Mode retains register settings and reference bias while disabling ADC cores and outputs; Sleep Mode powers down nearly all circuitry except wake-up logic. These modes are fully characterized over temperature and support rapid resumption (<1μs wake-up time) for burst-mode acquisition systems.