LTC1749IFW#TRPBF

Analog To Digital Converters (ADC) Overview

The LTC1749IFW#TRPBF is an 80Msps, 12-bit analog-to-digital converter (ADC) in a 48-lead TSSOP package. It features a 500MHz sample-and-hold bandwidth and a single 5V supply with 1.45W power dissipation. The device includes a programmable gain amplifier (PGA) for input ranges of 2.25VP-P or 1.35VP-P. Key performance metrics include 71.8dB SNR and 87dB SFDR at PGA=0, and 70.2dB SNR with 87dB SFDR at PGA=1. It operates within the industrial temperature range (-40°C to 85°C) and utilizes a flow-through pinout for simplified board layout.

Analog To Digital Converters (ADC) Feature Summary

• 80Msps sampling rate with 500MHz full-power bandwidth
• Integrated PGA providing selectable 2.25VP-P or 1.35VP-P input ranges
• Ultralow jitter of 0.15ps RMS enabling effective undersampling
• 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 #TRPBF suffix indicates tape-and-reel packaging. Confirm the 'I' grade designation matches the required -40°C to 85°C operating temperature range. Ensure the 48-pin TSSOP footprint aligns with the design schematic before procurement.

Analog To Digital Converters (ADC) Selection Notes

Select this component when high linearity and wide dynamic range are required for signals up to 500MHz. The internal PGA simplifies front-end driver requirements by allowing direct optimization of the input voltage range. Verify that the system can accommodate the 1.45W power dissipation and provide adequate bypassing for the 5V analog and digital supplies.

Analog To Digital Converters (ADC) Part Context

This part belongs to the LTC1749 family of wide-bandwidth ADCs. It is pin-compatible with the 14-bit LTC1750, allowing for resolution upgrades without changing the PCB layout. The device is designed for applications requiring high dynamic range digitization of wideband signals.

Analog To Digital Converters (ADC) Replacement Considerations

The LTC1750IFW#TRPBF is a confirmed pin-compatible substitute offering 14-bit resolution. Other members of the LTC1749 family may be considered if different temperature grades or packaging options are required.

Analog To Digital Converters (ADC) FAQ

How is the analog input common mode voltage established?

The VCM pin provides a 2.0V output used to bias the differential analog inputs. This pin must be bypassed to ground with a 4.7µF capacitor.

What determines the data latency of the conversion?

The LTC1749 has a fixed data latency of 5 cycles. Data should be latched on the rising edge of the CLKOUT signal.

Can the digital output drivers operate at voltages other than 5V?

Yes, the OVDD supply for the output drivers can range from 0.5V to 5V, allowing direct connection to low-voltage DSPs or FIFOs.