LTC1749CFW#PBF

Analog To Digital Converters (ADC) Overview

The LTC1749CFW#PBF is an 80Msps, 12-bit analog-to-digital converter (ADC) designed for digitizing wide dynamic range signals up to 500MHz. It features a highly linear sample-and-hold circuit with a 500MHz full power bandwidth and ultralow jitter of 0.15ps RMS. The device includes an on-chip programmable gain amplifier (PGA) allowing selectable input ranges of 2.25VP-P or 1.35VP-P. Key performance metrics include a Signal-to-Noise Ratio (SNR) of 71.8dB at PGA=0 and 70.2dB at PGA=1, with a Spurious Free Dynamic Range (SFDR) of 87dB. It operates on a single 5V supply with a typical power dissipation of 1.45W.

Analog To Digital Converters (ADC) Feature Summary

• 80Msps sampling rate with 12-bit resolution and no missing codes
• Integrated PGA front end with selectable 2.25VP-P or 1.35VP-P input ranges
• 500MHz full power bandwidth sample-and-hold circuit with 0.15ps RMS jitter
• Digital interface compatible with 5V, 3V, 2V, and LVDS logic systems

Analog To Digital Converters (ADC) Applications

• Direct IF Sampling
• Telecommunications Receivers
• Cellular Base Stations
• Spectrum Analysis
• Communications Test Equipment

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix '#PBF' indicates lead-free packaging compliance when sourcing. Confirm that the 'C' grade variant supports the required operating temperature range of 0°C to 70°C for the target application environment. Ensure the 48-pin TSSOP package dimensions align with the PCB footprint design constraints.

Analog To Digital Converters (ADC) Selection Notes

Select this component for applications requiring high-speed digitization of wideband signals up to 500MHz. The internal PGA allows optimization of the input range without external amplifiers. Consider the 1.45W power dissipation for thermal management in the 48-lead TSSOP package. Verify compatibility with downstream DSPs using the adjustable OVDD supply range of 0.5V to 5V.

Analog To Digital Converters (ADC) Part Context

The LTC1749 belongs to a family of high-speed pipelined ADCs from Analog Devices. It is pin-compatible with the 14-bit 80Msps LTC1750, allowing for potential resolution upgrades within the same footprint. The device utilizes a proprietary CMOS process to achieve low noise and high linearity in a compact surface-mount package.

Analog To Digital Converters (ADC) Replacement Considerations

The LTC1750 is a confirmed pin-compatible substitute offering 14-bit resolution at the same 80Msps sampling rate. Designers requiring higher resolution may consider this alternative while maintaining board layout compatibility.