GF9102A

The GF9102A is a linear phase FIR digital filter that is usable in a variety of video signal processing applications. The evice contains three separate fixed coefficient filters and can be operated in three basic modes: 53 tap low pass filter, 9 tap chroma bandpass filter or 21 tap chroma bandpass filter.

In the 53 tap low pass filter mode, the GF9102A can replace the TMC2242 in all applications, except those requiring 1:1 low pass filtering, for improved performance and full CCIR 601 compatibility. Specific improvements include true unity gain at DC, 12.4 dB attenuation at ƒs/4 with a single device, reduced output ringing with constant input in interpolate mode, support for signed and unsigned data formats, rounding to 10 and 8 bit CCIR 601 data formats, masking of serial digital TRS codes in the data stream, and elimination of the non-saturated-type overflow condition. The device can be operated in both TMC2242 compatible modes and in GF9102A enhanced modes.

When used as a decimating post-filter with a double speed oversampling analog-digital converter, the device greatlyreduces the cost and complexity of the associated analog anti-aliasing pre-filter. In a similar fashion, when used as an interpolating pre-filter with a double speed oversampling digitalanalog converter, the GF9102A simplifies the analog reconstruction post-filter. The GF9102A also exceeds the requirements for conversion between 4:2:2 and 4:4:4 signal formats.

For chroma filtering applications, the GF9102A can be operated as a 9 or 21 tap bandpass filter by selecting the appropriate operating mode.

The GF9102A is packaged in a 44 pin PLCC and is pin compatible with the TMC2242. The device operates with a single +5 V supply.