AH1053 - Faraday Technology - Datasheet.Directory

FARA004.DOC Page 1 of 2 Jun-99(A)

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. • Designed for Philips video encoders (SAA7185, SAA7199).

• Group delay equalisation provided on AH1013. • Excellent Differential Gain and Phase.

• Accurate Sinx/x correction for 27 MHz sampling. • 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 + 0.5 dB from DC to 5 MHz

+ 0.75 dB from 5 MHz to 7 MHz

with 27 MHz Sinx/x equalisation

+ 0.5 dB from DC to 5 MHz

+ 0.75 dB from 5 MHz to 7 MHz

with 27 MHz Sinx/x equalisation

Start Of Stopband 21 MHz 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

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