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TH7301 Datasheet(PDF) 1 Page - Melexis Microelectronic Systems |
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TH7301 Datasheet(HTML) 1 Page - Melexis Microelectronic Systems |
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1 / 14 page  TH7301 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 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) Applications Y Digital Broadcasting Systems (DBS) and Digital Video Broadcasting (DVB) Y Satellite and cable TV decoders Y Microwave point to point links Block Diagram Figure 1: Block Diagram 4th Order Butterworth Filter 4th Order Butterworth Filter Fixed Gain Fixed Gain Dual-Channel Programmable Low-Pass Filter Rev. 2.1 November 1999 |
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