The HSP43216 Halfband Filter addresses a wide variety of applications by combining fS/4 (fS = sample frequency) quadrature up/down convert circuitry with a fixed coefficient halfband filter processor as shown in the block diagram. These elements may be configured to operate in one of the four following modes: decimate by 2 filtering of a real input signal; interpolate by 2 filtering of a real input signal; fS/4 quadrature down conversion of a real input signal followed by decimate-by-2 filtering to produce a complex analytic signal; interpolate-by-2 filtering of a complex analytic signal followed by fS/4 quadrature up conversion to produce a real valued output.

Features

• Sample Rates to 52MSPS

• Architected to Support Sample Rates to 104MSPS Using External Multiplexer

• Four Modes of Operation:

- Interpolate by 2 Filtering

- Decimate by 2 Filtering

- Quadrature to Real Signal Conversion

- fS/4 Quadrature Down Conversion Followed by Decimate by 2 Filtering

• 16-Bit Inputs and Outputs

• 67-Tap Halfband FIR Filter with 20-Bit Coefficients

• Two’s Complement or Offset Binary Outputs

• Programmable Rounding on Outputs

• 1.24:1 Filter Shape Factor

• >90dB Stopband Attenuation

• <0.0003dB Passband Ripple

• Saturation Logic on Output

• Pb-Free Available (RoHS Compliant)

Applications

• Digital Down Conversion

• D/A and A/D pre/post Filtering

• Tuning Bandwidth Expansion for HSP45116 and HSP45106