LTC2221IUP#PBF

Analog To Digital Converters (ADC) Overview

The LTC2221IUP#PBF is a 12-bit, 135Msps analog-to-digital converter (ADC) from Analog Devices Inc., housed in a 64-lead 9mm × 9mm QFN package. It operates on a single 3.3V supply with typical power dissipation of 890mW in CMOS mode and 660mW in LVDS mode. The device features an internal reference, selectable input ranges of –0.5V or –1V, and supports differential or single-ended encode inputs. Key performance metrics include a typical SNR of 67.5dB at 140MHz input and an SFDR of 80dB up to 170MHz. It offers pipeline latency of 5 cycles and includes shutdown/nap modes.

Analog To Digital Converters (ADC) Feature Summary

• 12-Bit Resolution with 135Msps Sampling Rate
• Low Jitter: 0.15ps RMS for excellent undersampling performance
• Flexible Digital Outputs: LVDS, Full-Rate CMOS, or Demultiplexed CMOS
• Selectable Input Ranges: –0.5V or –1V via SENSE pin

Analog To Digital Converters (ADC) Applications

• Wireless and Wired Broadband Communication Systems
• Cable Head-End Systems
• Power Amplifier Linearization
• Communications Test Equipment

Analog To Digital Converters (ADC) Procurement Notes

Verify the #PBF suffix indicates lead-free compliance and the I temperature grade covers -40°C to 85°C. Confirm the QFN-64 package footprint matches the design schematic. Check for RoHS certification status in the latest manufacturer documentation before finalizing procurement specifications.

Analog To Digital Converters (ADC) Selection Notes

Select the LTC2221 over the LTC2220 when a 135Msps sampling rate is sufficient, as it offers lower power consumption (660mW vs 890mW in CMOS mode). Ensure the application requires 12-bit resolution; if 10-bit is acceptable, consider the pin-compatible LTC2231 for further power reduction. Verify that the required input frequency range does not exceed the 170MHz full-power bandwidth specification.

Analog To Digital Converters (ADC) Part Context

The LTC2221 is part of the LTC2220/LTC2221 family of high-speed ADCs designed for wide dynamic range signal digitization. It shares the same 64-pin QFN package and pinout with the LTC2220 (170Msps), LTC2230 (10-bit, 170Msps), and LTC2231 (10-bit, 135Msps), allowing for flexible design upgrades within the same form factor.

Analog To Digital Converters (ADC) Replacement Considerations

The LTC2220IUP#PBF is a pin-compatible alternative with a higher 170Msps sampling rate but higher power dissipation. For 10-bit applications, the LTC2231IUP#PBF offers similar speed with reduced power. No other direct substitutes are documented in the provided datasheet.