LTC6605IDJC-7#PBF

Overview

The LTC6605IDJC-7#PBF is a dual-channel, matched 2nd order lowpass filter with differential amplifiers. It features an adjustable f–3dB frequency range of 6.5MHz to 10MHz and operates on a supply voltage from 2.7V to 5.25V. The device provides pin-selectable gains of 0dB, 12dB, or 14dB. Internal laser-trimmed components ensure gain matching within ±0.35dB and phase matching within ±1.2° in the passband. It offers low noise density of 2.1nV/√Hz and distortion below –90dBc. The component is housed in a compact 22-pin 6mm × 3mm DFN package.

Feature Summary

• Dual fully differential amplifiers configured as matched second-order lowpass filters
• Internal laser-trimmed resistors and capacitors for precise gain and phase matching
• Pin-selectable power consumption states including shutdown, medium power, and full power
• Adjustable output common mode voltage control buffer

Applications

• WCDMA ADC driver and filtering
• Antialiasing filter applications
• Single-ended to differential signal conversion
• DAC smoothing filter circuits
• Zero-IF direct conversion receivers

Procurement Notes

Verify the specific ordering suffix IDJC-7#PBF against official Analog Devices documentation to confirm the industrial temperature grade (-40°C to 85°C). Ensure compatibility with the 22-lead plastic DFN package specifications. Cross-reference the manufacturer part number directly with authorized distributors to validate authenticity and current availability status before procurement.

Selection Notes

Select this component when dual matched filtering with low noise and high linearity is required. Verify that the 7MHz nominal cutoff fits the system bandwidth needs. Confirm that the 2.7V to 5.25V supply range matches the design constraints. Check if the 22-pin DFN package footprint is suitable for the PCB layout requirements.

Part Context

This part belongs to the LTC6605 family of active filters. The 'I' designation indicates the industrial temperature range variant. The '7' suffix specifies the 7MHz filter configuration. Other variants include the CDJC-7 for commercial temperatures and different frequency options like the 14MHz version.

Replacement Considerations

LTC6605CDJC-7#PBF (Commercial Temperature Grade)

FAQ

How is the power consumption controlled?

Power consumption is controlled via the BIAS pins. Driving the pin low enables shutdown, leaving it floating sets medium power, and driving it high enables full power operation.

What is the input common mode voltage range?

The input common mode range depends on the supply voltage and configuration. For a 3V supply, it typically ranges from -0.2V to 1.7V, allowing inputs slightly below the negative rail.

Can the filter gain be adjusted externally?

Yes, while three standard gains (0dB, 12dB, 14dB) are available without external components, adding external resistors allows for further customization of the passband gain and frequency response.