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GF9102ACTM Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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1 / 11 page DATA SHEET DEVICE DESCRIPTION The GF9102A is a linear phase FIR digital filter that is usable in a variety of video signal processing applications. The device 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 greatly reduces 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 digital- analog 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. FEATURES • improved performance over TMC2242 in applications not requiring 1:1 low pass filtering • low power (60mA typical at ƒ = 20MHz) • 40 MHz maximum clock rate • single device exceeds CCIR 601 lowpass filter requirements • true unity gain (0.0 dB) at DC • reduced output ringing with constant input in interpolation mode • built-in TRS code protection • 12 bit inputs and 16 bit outputs in 2's complement signed or unsigned formats • user-selectable 8 to 16 bit output rounding • can also be operated as a 9 or 21 tap chroma bandpass filter under user control • single +5 V power supply • three state outputs APPLICATIONS • CCIR 601-compliant oversampling video A/D and D/A conversion • 2:1 interpolation and decimation • 4:2:2 to 4:4:4 format conversion • Chroma bandpass filtering Multi GEN GEN™ GF9102A Decimating/Interpolating Digital Filter INPUT PROCESSING UNIT OUTPUT FORMAT TIMING CONTROLS CLK DEC SYNC DATA IN SI11..0 BPF1 OUTPUT PROCESSING UNIT INT TCO BPF2 53 TAP LPF M U X SO3..0 RND2..0 DATA OUT SO15..0 OE FUNCTIONAL BLOCK DIAGRAM Revision Date: February 1996 ORDERING INFORMATION Part Number Package Type Temperature Range GF9102ACPM 44 Pin PLCC 0 ° to 70° C GF9102ACTM 44 Pin PLCC Tape 0 ° to 70° C GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-5946 Gennum Japan Corporation: A-302 Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168, Japan tel. (03) 3334-7700 fax (03) 3247-8839 Document No. 521 - 26 - 02 |
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