Analog Devices Inc. LTC2246HLU#PBF

Overview

LTC2246HLU#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 25Msps low-power pipelined analog-to-digital converter optimized for high-frequency, wide-dynamic-range signal digitization in demanding imaging and communications systems. It operates from a single 3V supply (2.8V–3.5V), delivers 74.5dB SNR and 90dB SFDR at 5MHz input, supports –40°C to 125°C operation, and features flexible ±0.5V to ±1V differential input range with 575MHz full-power bandwidth.

For engineers reviewing the LTC2246HLU#PBF datasheet, LTC2246HLU#PBF pinout, LTC2246HLU#PBF application, or LTC2246HLU#PBF equivalent, key selection considerations include its guaranteed no-missing-codes performance over temperature, clock duty cycle stabilizer capability, shutdown/nap modes for power management, and TQFP-32 package compatibility with automotive and industrial signal acquisition designs.

Technical Context

The LTC2246HLU#PBF implements a six-stage CMOS pipelined ADC architecture with digital correction logic, achieving 5-cycle pipeline latency and supporting synchronous sampling on the rising edge of a single-ended CMOS/TTL clock. Its sample-and-hold circuit exhibits 0.2psRMS aperture jitter and 1LSBRMS transition noise, enabling high-fidelity digitization up to 140MHz input frequency.

Internal reference generation includes a 1.5V bandgap output (VCM) with ±25ppm/°C tempco and programmable input range via SENSE pin configuration (±0.5V at VCM, ±1V at VDD). The device integrates a clock duty cycle stabilizer activated by MODE pin biasing (1/3VDD or 2/3VDD), allowing robust operation across non-50% input clock duty cycles.

Key Specifications

Pinout & Package

Package: 32-lead (5mm × 5mm) plastic TQFP (LU package), RoHS-compliant, lead-free finish (PBF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9246BCPZ-25 and LTC2245HLU#PBF, the LTC2246HLU#PBF uniquely combines automotive-grade temperature range, integrated clock duty cycle stabilization, and single 3V supply operation - making it optimal for ruggedized, space-constrained signal acquisition where clock conditioning headroom is limited.

Availability

LTC2246HLU#PBF is available at Aetrix Electronics and suitable for automotive radar, industrial motor control, and wireless infrastructure applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2246HLU#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 LTC2246HLU#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for applications demanding wide dynamic range, low power, and extended temperature operation in harsh environments.

FAQ

What is the maximum input frequency supported by the LTC2246HLU#PBF while maintaining full-scale accuracy?

The LTC2246HLU#PBF has a 575MHz full-power bandwidth, meaning it maintains ≤3dB amplitude flatness for sinusoidal inputs up to that frequency at full-scale amplitude. At 140MHz input, measured SFDR remains at 85dB, confirming usable bandwidth well beyond Nyquist for undersampling applications. Performance data is validated per the datasheet's 8192-point FFT plots at 140MHz.

Does the LTC2246HLU#PBF require external reference components for basic operation?

No - the LTC2246HLU#PBF includes an internal 1.5V bandgap reference and fully functional reference buffer circuitry. External components required are only bypass capacitors: 0.1μF + 2.2μF ceramics on REFH/REFL, and ≥2.2μF on VCM. No external reference IC or resistor dividers are needed unless custom input ranges outside ±0.5V/±1V are required.

How does the clock duty cycle stabilizer in the LTC2246HLU#PBF affect system timing design?

The clock duty cycle stabilizer in the LTC2246HLU#PBF locks an internal PLL to the rising edge of the input CLK, generating a precise 50% internal duty cycle regardless of input duty cycle (20%–80%). This eliminates the need for external clock conditioners, reduces jitter sensitivity, and relaxes PCB trace length matching requirements - though a >1μs SHDN pulse is required at power-up to initialize the PLL.

Can the LTC2246HLU#PBF interface directly with a 1.8V FPGA I/O bank?

Yes - the LTC2246HLU#PBF's OVDD pin accepts 0.5V to 3.6V, allowing direct connection to 1.8V FPGA I/O banks. When OVDD = 1.8V, VOH is guaranteed ≥1.79V and VOL ≤0.09V at 1.6mA sink current, meeting LVCMOS18 voltage thresholds. Output drive strength remains sufficient without level-shifting circuitry.

What is the significance of the "H" suffix in LTC2246HLU#PBF?

The "H" suffix in LTC2246HLU#PBF denotes the high-temperature grade, specifying guaranteed operation from –40°C to 125°C and qualification per AEC-Q100 stress test requirements for automotive applications. This distinguishes it from commercial-grade variants (e.g., LTC2246LU#PBF) rated only to 85°C ambient.