TH7301 datasheet(8/14 Pages) MELEXIS

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TH7301 Dual-Channel Programmable Low-Pass Filter

The application diagram below is an example

diagram and provided to assist the customer in

using the IC. The configuration can be changed

for other applications.

Application

Diagram

Figure 4: Application Diagram

I channel

Output

I channel

Input

Q channel

Output

3-wire

Serial

Interface

Q channel

Input

-5 Vdc

DAC

-5 Vdc

TH7301

VCCI

QOUT

VEEQ

RDAC

SDEN

SCLK

SDATA

VEEI

IOUT

IIN

IREF

VDD

VSS

QREF

QIN

VCCQ

Component

Function

Value

Unit

C1, C2, C3, C4

AC coupling capacitors

100

C5, C6, C7

AC coupling capacitors

RDAC

DAC current setting resistor

4.5

Ω

Important notice

It is recommended to operate the device from a

single power supply for both analog and digital

sections of the device. Operation from separate

power supplies on VEE and VSS and absence of

the digital voltage may cause destruction of the

device.

The serial interface does not contain a power on

reset, thus all three registers must be programmed

after power on to prevent undefined logical states and

to achieve reliable filter operation. I. e. a first reset

word may reset all registers to 0.

Component List

for Application

Diagram

The AC coupling capacitors (C1-C4) will produce

a high pass pole with the 3k

Ω input resistance.

Their value should be chosen such that this pole

is below any frequencies of interest in the system.

The Rdac resistor is the current setting resistor for

the DAC. The recommended values are listed

below.

TH7301 Datasheet(PDF) 8 Page - Melexis Microelectronic Systems

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