Datasheet > TH7301

TH7301

更新时间： 2024-09-23 05:52:31

品牌	Logo	应用领域
其他 - ETC		/
页数	文件大小	规格书
14页	279K
描述
Dual-Channel Programmable Low-Pass Filter

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TH7301 数据手册

TH7301

Dual-Channel Programmable

Low-Pass Filter

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.

Description

Wide cutoff frequency range (0.8 MHz to

22.4 MHz)

Low power consumption (<105 mA, typical 55 mA

from -5 V supply; Fc = 1 MHz @ 25°C)

Features

Dual-channel architecture produces superior

matching and ease of use for quadrature signals

Single ended or differential input operation

possible (AC coupled)

Companding design provides higher resolution at

lower cutoff frequencies

No external components for trimming necessary

Small package (16-pin SOP)

Digital Broadcasting Systems (DBS) and

Digital Video Broadcasting (DVB)

Applications

Satellite and cable TV decoders

Microwave point to point links

Block Diagram

Fixed Gain

4th Order

Butterworth

Filter

4th Order

Butterworth

Filter

Fixed Gain

Figure 1: Block Diagram

Rev. 2.1

November 1999

12 3 4 5 6 7...14

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