Analog Devices Inc. DC1282A-A

Overview

LTC2209 from Analog Devices (acquired Linear Technology) is a 16-bit, 160Msps analog-to-digital converter optimized for high-frequency signal digitization up to 700MHz full-power bandwidth, featuring 77.3dBFS noise floor, 100dB spurious-free dynamic range (SFDR), and 70fsRMS aperture jitter - deployed in cellular base station receivers and spectrum analyzers requiring wide dynamic range and undersampling capability.

For engineers reviewing the LTC2209 datasheet, LTC2209 pinout, LTC2209 application, or LTC2209 equivalent, this page delivers verified package mapping (64-pin QFN), LVDS/CMOS output configuration options, PGA front-end gain selection (1× or 1.5×), clock duty cycle stabilization, and dither/randomizer functionality - all confirmed from official Linear Technology documentation.

Technical Context

The LTC2209 implements a 16-bit pipelined ADC core with integrated sample-and-hold and programmable gain amplifier (PGA), supporting differential analog inputs up to ±1.125V with 1.25V common-mode bias (VCM). Its clock interface accepts sine wave, PECL, LVDS, TTL, or CMOS inputs, and includes an optional internal duty cycle stabilizer for robust operation across wide input duty cycles.

Digital outputs are configurable as either differential LVDS (standard or low-power mode) or single-ended CMOS (full-rate or demultiplexed), with separate OVDD supply enabling 0.5V–3.6V CMOS swing. Output format supports offset binary or 2's complement, and features optional internal dither and data randomization to suppress harmonic artifacts and digital coupling noise.

Key Specifications

Pinout & Package

64-lead (9mm × 9mm) plastic QFN package with exposed thermal pad (Pin 65 = GND), rated for 0°C to 70°C (C-grade) or –40°C to 85°C (I-grade). Requires 1µF ceramic bypass on each VDD pin and ≥2.2µF on VCM.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9268-16EBZ and LTC2217, the LTC2209 uniquely delivers 160Msps sampling with 700MHz bandwidth and integrated PGA - making it the only option among the three for direct RF sampling above 250MHz while maintaining 100dB SFDR.

Availability

LTC2209 is available at Aetrix Electronics and suitable for cellular infrastructure, test instrumentation, medical imaging, and defense radar systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LTC2209 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 LTC2209 belongs to ADI's high-speed precision ADC product line, designed specifically for demanding communications and instrumentation applications requiring ultra-low jitter, wide bandwidth, and flexible digital interface options.

FAQ

What is the maximum analog input frequency supported by the LTC2209?

The LTC2209 supports a full-power analog input bandwidth of 700MHz, meaning it can accurately digitize signals with fundamental frequencies up to 700MHz while maintaining specified dynamic performance (e.g., SFDR >84dB at 250MHz). This enables direct RF sampling in L- and S-band applications without external downconversion stages. The LTC2209 achieves this via a high-bandwidth sample-and-hold circuit and optimized internal architecture.

Does the LTC2209 support both LVDS and CMOS digital outputs?

Yes, the LTC2209 supports both LVDS and CMOS digital outputs through the LVDS pin (Pin 61): connecting it to VDD selects standard LVDS mode; to 2/3VDD selects low-power LVDS; to 1/3VDD selects demultiplexed CMOS; and to ground selects full-rate CMOS. CMOS outputs support 0.5V–3.6V swing via separate OVDD supply, allowing interoperability with diverse FPGA and ASIC I/O standards. The LTC2209 does not require external level shifters for these configurations.

How does the PGA feature affect the input range and performance of the LTC2209?

The PGA (Pin 64) selects between two input ranges: low = 2.25VP-P (1× gain), high = 1.5VP-P (1.5× gain). At 1.5× gain, smaller input signals fill more of the ADC's code range, improving effective SNR for low-amplitude signals - but reducing headroom for large transients. The LTC2209 maintains full 16-bit linearity and specified SFDR across both settings, with noise floor and distortion performance validated per mode in the datasheet.

What is the purpose of the internal dither function in the LTC2209?

The internal dither (enabled via DITH pin) injects controlled noise into the ADC's quantization process to break up harmonic correlation and reduce spurious tones - particularly beneficial at low input levels (e.g., –25dBFS), where SFDR improves from 100dB to 115dB. The LTC2209's dither is fully integrated and calibrated; no external components or firmware overhead are required. It is commonly used in spectrum analysis and ATE applications to ensure spurs remain below the noise floor.

Can the LTC2209 operate with non-50% duty cycle clock inputs?

Yes, the LTC2209 includes an optional clock duty cycle stabilizer (enabled via MODE pin) that corrects asymmetric clock waveforms internally, allowing high-performance sampling even with duty cycles from 30% to 70%. Without stabilization, minimum ENC high/low times are 2.97ns; with stabilization, they relax to 2.1ns - accommodating clocks from PLLs or dividers without external duty-cycle correction circuitry. This capability is explicitly characterized and guaranteed for the LTC2209.