Analog Devices Inc. LTC2297CUP#PBF

Overview

LTC2297CUP#PBF from Analog Devices (formerly Linear Technology) is a dual 14-bit, 40Msps low-power analog-to-digital converter operating from a single 3V supply. It delivers 74.3dB SNR and 90dB SFDR at Nyquist, with 110dB channel isolation at 100MHz, and supports flexible differential or single-ended analog inputs up to 2V_P-P across a 575MHz full-power bandwidth - ideal for high-fidelity spectral analysis and portable instrumentation.

For engineers reviewing the LTC2297CUP#PBF datasheet, LTC2297CUP#PBF pinout, LTC2297CUP#PBF application, or LTC2297CUP#PBF equivalent, key selection considerations include its 40Msps sample rate, dual-channel 14-bit resolution with ±1.2LSB INL, integrated clock duty cycle stabilizer, multiplexed or separate digital output bus, and 64-pin QFN package with exposed thermal pad.

Technical Context

The LTC2297CUP#PBF implements a six-stage CMOS pipelined ADC architecture per channel, achieving five-cycle pipeline latency and supporting simultaneous sampling of two independent analog signals. Its internal 1.5V reference and programmable input range (±0.5V to ±1V via SENSEA/SENSEB pins) enable precise DC-coupled signal acquisition without external reference components.

It features independent shutdown and nap modes per channel (SHDNA/SHDNB), configurable output format (offset binary or 2's complement via MODE pin), and clock duty cycle stabilization that maintains AC performance across wide input duty cycles - critical for systems using non-50% clock sources in communications and imaging front ends.

Key Specifications

Pinout & Package

Package: 64-lead (9mm × 9mm) plastic QFN with exposed GND pad (Pin 65), 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 ADC applications.

Compared with AD9257BCPZ-40 and LTC2292CUH#PBF, the LTC2297CUP#PBF uniquely combines 14-bit resolution, integrated reference, 3V single-supply operation, and 110dB channel isolation - making it optimal for portable test equipment where accuracy, integration, and thermal efficiency are jointly critical.

Availability

LTC2297CUP#PBF is available at Aetrix Electronics and suitable for wireless baseband receivers, portable spectrum analyzers, and ultrasound imaging systems requiring stable component supply and guaranteed C-grade temperature performance (0°C to 70°C).

Supply support for LTC2297CUP#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 LTC2297CUP#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for demanding dual-channel digitization in portable instrumentation, communications infrastructure, and medical imaging where SNR, SFDR, and channel matching are design-critical.

FAQ

What is the maximum analog input frequency supported by the LTC2297CUP#PBF?

The LTC2297CUP#PBF has a 575MHz full-power bandwidth, meaning it can accurately digitize analog signals up to 575MHz at full-scale amplitude before the response drops by 3dB. This enables direct RF sampling in VHF applications and preserves signal integrity for wideband IF signals up to 200MHz with minimal attenuation - confirmed in Figure 8 of the official datasheet under "Full Power Bandwidth" test conditions.

Does the LTC2297CUP#PBF require an external reference voltage?

No, the LTC2297CUP#PBF includes an internal 1.5V reference and supports fully self-contained operation. The SENSEA and SENSEB pins allow selection of ±0.5V or ±1V input ranges using internal biasing (VCMA/VCMB or VDD), eliminating the need for external reference components unless a custom reference voltage between 0.5V and 1V is required for specialized input scaling.

How does the clock duty cycle stabilizer in the LTC2297CUP#PBF improve system design?

The clock duty cycle stabilizer in the LTC2297CUP#PBF actively corrects input clock asymmetry, maintaining 74.3dB SNR even with 40–60% duty cycle - unlike fixed-ratio clock conditioners. This relaxes clock generator specifications, allows use of simple crystal oscillators or PLLs without dedicated duty cycle correction, and ensures consistent AC performance across temperature and voltage variations.

Can the LTC2297CUP#PBF operate with different supply voltages for analog and digital outputs?

Yes, the LTC2297CUP#PBF uses separate supplies: VDD (2.7–3.4V) powers the analog core and reference circuitry, while OVDD (0.5–3.6V) independently powers the digital output drivers. This allows direct interfacing with 1.8V FPGAs, 2.5V ASICs, or 3.3V microcontrollers without level shifters - verified in the "Digital Inputs and Digital Outputs" section of the datasheet with VOH/VOL specs across all three OVDD levels.

What is the pipeline latency of the LTC2297CUP#PBF and how does it affect timing alignment?

The LTC2297CUP#PBF has a fixed 5-cycle pipeline latency from CLK edge to valid data output, as specified in the Timing Characteristics table. This deterministic delay enables precise time-of-flight calculations in dual-channel systems like ultrasound beamformers and allows FPGA-based synchronization logic to align Channel A and B data streams with sub-sample accuracy - confirmed by the "Pipeline Latency" parameter (5 cycles) and timing diagrams TD01/TD02.