ADI LTC1564IG#PBF

The LTC1564 is a new type of continuous time filter for antialiasing, reconstruction and other band-limiting applications. No other analog components or filter expertise are needed to use it. There is one analog input pin and one analog output pin. The cutoff frequency (fC) and gain are programmable while the shape of the lowpass response is fixed. A latching digital interface stores fC and gain settings or it can be bypassed for control directly from the pins. The LTC1564 operates from 2.7V to 10V total (single or split supplies) and comes in a 16-pin surface mount SSOP.

The LTC1564 is a rail-to-rail high resolution 8th-order lowpass filter with two stopband notches, giving approximately 100dB attenuation at 2.5 times the passband cutoff frequency fC (a de facto standard for DSP front ends). Signals with low or variable levels can be normalized with the built-in variable gain that reduces input-referred noise with increasing gain for a typical dynamic range (maximum signal level to minimum noise) of 122dB (20 equivalent bits) with 20kHz fC and 118dB at 100kHz fC on a ±5V supply.

• 4-Bit Digitally Controlled 8th-Order Lowpass Filter
• fCUTOFF Adjustable from 10kHz to 150kHz in 10kHz Steps
• 100dB Attenuation at 2.5 × fCUTOFF
• 4-Bit Digitally Controlled Programmable Gain Amplifier
• G = 1 to 16 in 1V/V Steps
• Miniature 16-Pin SSOP Package
• No External Components
• 122dB Total System Dynamic Range
• Rail-to-Rail Input and Output Range
• 2.7V to 10V Operation
• Low Noise Mute Mode
• Low Power Shutdown Mode
• Available in 16-Lead Plastic SSOP Package

• Antialias or Reconstruction Filtering
• DSP Systems
• Communications Systems
• Scientific Instruments
• High Resolutions (16 Bits to 20 Bits)
• Processing Signals Buried in Noise
• Audio Signal Processing
• Programmable Data Rates
• Automatic Gain Control (AGC)
• Single Part Replacing Multiple Filters