AH847 FULLY BUFFERED SHARP ROLL-OFF LUMINANCE FILTER The AH847 has been designed for filtering PAL or luminance signals in post D/A applications. The performance specification is based on the Faraday TFT range of passive filters offering good rejection at the 6.75 MHz point but sinx/x compensated for a 27 MHz sampling frequency. Interfacing to the system is simplified with high input and low output impedance op-amp buffer stages. Filter Shape Lowpass Passband Shape Sinx/x Sampling Frequency 27 MHz Gain - 0.2 dB + 0.2 dB +5.8 dB + 0.2 dB End Of Passband 5.5 MHz Passband Amplitude Ripple 0.25 dB max Loss at 6.75 MHz wrt 5.75 MHz 12 dB + 2 dB Start Of Stopband 8.0 MHz Stopband Attenuation wrt 5.5 MHz Group Delay Ripple 40 dB min to 20 MHz 35 dB min to 50 MHz 15.0 ns max to 5.0 MHz Delay Time at 200 kHz 296 ns + 10 ns Typical Current 30 mA (15 mA per rail at + 5 v) Input Impedance 2 MΩ typical Package DR00032A with pin 6 open with pin 6 gnd © Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice FARA029.DOC Page 1 of 2 Jun-99(A) PACKAGE DETAIL Faraday Technology Ltd. Croft Road Industrial Estate, Newcastle, Staffordshire ST5 0QZ. England. FARA029.DOC Tel: Fax: Email: Web site: Page 2 of 2 + 44 (0)1782 661501 + 44 (0)1782 630101 [email protected] http://www.faradaytech.co.uk Jun-99(A)