TH7301 데이터 시트보기 (PDF) - Unspecified

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TH7301

Dual-Channel Programmable Low-Pass Filter

Unspecified 

TH7301 Dual-Channel Programmable Low-Pass Filter

Application

Diagram

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.

I channel

Input

C2

C1

-5 Vdc

C4

C5

Q channel

Input

C3

1 VCCI

IOUT 16

2 IIN

VEEI 15

3 IREF

SDATA 14

4 VDD

SCLK 13

TH7301

5 VSS

SDEN 12

6 QREF

RDAC 11

7 QIN

VEEQ 10

8 VCCQ

QOUT 9

I channel

Output

C6

RDAC

3-wire

Serial

Interface

-5 Vdc

C7

Q channel

Output

Figure 4: Application Diagram

Component List

for Application

Diagram

The AC coupling capacitors (C1-C4) will produce

a high pass pole with the 3kΩ input resistance.

Their value should be chosen such that this pole

is below any frequencies of interest in the system.

Component

C1, C2, C3, C4

C5, C6, C7

RDAC

Function

AC coupling capacitors

AC coupling capacitors

DAC current setting resistor

The Rdac resistor is the current setting resistor for

the DAC. The recommended values are listed

below.

Value

100

22

4.5

Unit

nF

nF

kΩ

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.

8

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