AH847 - Faraday Technology

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
sales@faradaytech.co.uk
http://www.faradaytech.co.uk
Jun-99(A)