SET-TOP BOX FILTERS These multichannel post filters contain all the filtering and buffering required to interface a digital video encoder directly to a 75 ohm Composite and Y/C output. Most oversampled encoders do not provide Sinx/x correction and introduce significant DC offset due to operation from a single supply rail. In addition the output impedance of voltage mode DACs are subject to large tolerances which can introduce large gain variations when loaded by external filters. The filters are Sinx/x corrected and available either with or without group delay correction. In addition they have a high input impedance which reduces significantly the gain variation of the encoder and are DC coupled with offset adjustment. FEATURES: • • • Two Composite and one Y/C output from one Y/C input. Group delay equalisation provided on AH1013. Accurate Sinx/x correction for 27 MHz sampling. • • • Designed for Philips video encoders (SAA7185, SAA7199). Excellent Differential Gain and Phase. DC coupling eliminates tilt problems. Filters available for Analog Devices, Brooktree, Harris, Raytheon etc on request. AH1013 AH1053 Filter Shape Lowpass Lowpass Passband Shape Sinx/x Sinx/x Sampling Frequency 27 MHz 27 MHz End Of Passband 6 MHz 6 MHz Passband Amplitude Ripple Start Of Stopband + 0.5 dB from DC to 5 MHz + 0.75 dB from 5 MHz to 7 MHz with 27 MHz Sinx/x equalisation 21 MHz + 0.5 dB from DC to 5 MHz + 0.75 dB from 5 MHz to 7 MHz with 27 MHz Sinx/x equalisation 21 MHz Group Delay Ripple + 5 ns + 20 ns Group Delay Bandwidth 5 MHz 5 MHz Gain 0 dB + 0.25 dB at 100 kHz 0 dB + 0.25 dB at 100 kHz Differential Phase 0.2 degrees 0.2 degrees Differential Gain 0.2 % 0.2 % Supply Voltages + 5v to + 12v + 5v to + 12v Impedance 75 ohms 75 ohms Temperature Range 0°C to 70°C 0°C to 70°C Package DR00144A DR00144A © Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice FARA004.DOC Page 1 of 2 Jun-99(A) PACKAGE DETAIL Faraday Technology Ltd. Croft Road Industrial Estate, Newcastle, Staffordshire ST5 0QZ. England. FARA004.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)