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Thesys - Dual-Channel Programmable Low-Pass Filter

Numéro de référence TH7301
Description Dual-Channel Programmable Low-Pass Filter
Fabricant Thesys 
Logo Thesys 





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TH7301 fiche technique
TH7301
Dual-Channel Programmable
Low-Pass Filter
Description
The device incorporates two matching 4th-order
Butterworth filters with voltage gain control to
perform low-pass filtering on quadrature demo-
dulated signals. The cutoff frequency and inband
gain are programmable via a standard 3-wire
interface. The cutoff frequency can be set between
0.8 MHz and 22.4 MHz and the inband voltage
gain can be set between -3 dB and 20 dB. The
cutoff frequency value is determined via a 10-bit
control word, with smaller step sizes in the lower
portion of the cutoff frequency range. The device
contains an on-chip oscillator to adjust the cutoff
frequency. Maintaining amplifiers configure the
Butterworth filter as the phase shift component of
the oscillator. The frequency of oscillation tracks
the filter cutoff frequency. The cutoff frequency of
the filter can be accurately set according to the
resolution of the IC by measuring the frequency of
oscillation.
Features
Applications
Y Wide cutoff frequency range (0.8 MHz to
22.4 MHz)
Y Dual-channel architecture produces superior
matching and ease of use for quadrature signals
Y Companding design provides higher resolution at
lower cutoff frequencies
Y Low power consumption (<105 mA, typical 55 mA
from -5 V supply; Fc = 1 MHz @ 25°C)
Y Single ended or differential input operation
possible (AC coupled)
Y No external components for trimming necessary
Y Small package (16-pin SOP)
Y Digital Broadcasting Systems (DBS) and
Digital Video Broadcasting (DVB)
Y Satellite and cable TV decoders
Y Microwave point to point links
Block Diagram
4th Order
Butterworth
Filter
Fixed Gain
4th Order
Butterworth
Filter
Fixed Gain
Figure 1: Block Diagram
Rev. 2.1
November 1999
Free Datasheet http://www.Datasheet4U.com

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