LTC1562IG-2#PBF

Overview

The LTC1562IG-2#PBF is a low noise, low distortion continuous time filter with rail-to-rail inputs and outputs, optimized for a center frequency (fO) of 20kHz to 300kHz. It contains four independent 2nd order filter blocks that can be cascaded in any combination. Each block's response is programmed with three external resistors for center frequency, Q and gain. The device operates on a total supply voltage of 4.75V to 10.5V. It features a typical S/N of 99dB at -5V supply and 93dB at single 5V supply. The operating temperature range is -40°C to 85°C.

Feature Summary

• Continuous time architecture requiring no clock
• Four independent 2nd order filter sections
• Rail-to-rail input and output voltages
• "Zero-Power" shutdown mode

Applications

• High Resolution Systems (14 Bits to 18 Bits)
• Antialiasing/Reconstruction Filters
• Data Communications, Equalizers
• Dual or I-and-Q Channels
• Replacing LC Filter Modules

Procurement Notes

Verify the specific suffix #PBF indicates lead-free status and RoHS compliance when sourcing. Confirm the IG-2 designation matches the industrial temperature range (-40°C to 85°C). Ensure the SSOP-20 package availability aligns with current manufacturing cycles as this component may have limited production runs.

Selection Notes

Select this component for applications requiring dynamic range up to 114dB with varying gain. Use for dual 4th order Butterworth lowpass filters from a single 5V supply. Consider the 20kHz to 300kHz center frequency optimization over the standard LTC1562. Verify external resistor tolerances impact fO accuracy.

Part Context

The LTC1562IG-2#PBF belongs to the LTC1562-2 family, which is a higher frequency variant of the LTC1562. While the original LTC1562 has a design center fO of 100kHz, the LTC1562-2 is optimized for 200kHz. Both share pin compatibility but differ in internal R and C values and amplifier speed.

Replacement Considerations

LTC1562CG-2

FAQ

How is the center frequency programmed?

The center frequency is set by two external resistors, R2 and RQ, using simple design formulas based on internal precision components.

What is the shutdown behavior?

When the SHDN pin goes high or is open-circuited, the device enters a "zero-power" shutdown state where only junction leakage currents flow.

Can it provide highpass responses?

Yes, a highpass response is available if an external capacitor replaces one of the input resistors.