LTC1294BCN Просмотр технического описания (PDF) - Linear Technology

Номер в каталоге

Компоненты Описание

производитель

LTC1294BCN

Single Chip 12-Bit Data Acquisition System

Linear Technology 

LTC1293/LTC1294/LTC1296

APPLICATI S I FOR ATIO

A “Quick Look” Circuit for the LTC1294/6

Users can get a quick look at the function and timing of the

LTC1294/6 by using the following simple circuit (Figure

23). VREF is tied to VCC. DIN is tied high which means VIN

should be applied to the CH7 with respect to COM. A

Unipolar conversion is requested and the data is output

MSB first. CS is driven at 1/64 the clock rate by the CD4520

and DOUT outputs the data. The output data from the DOUT

pin can be viewed on an oscilloscope that is set up to

trigger on the falling edge of CS (Figure 24).

+5V

22µF

VIN

CH0

DVCC

CH1

AVCC

CH2

CLK

CH3

CS

CH4 LTC1294 DOUT

CH5

DIN

CH6

REF+

CH7

REF–

COM

DGND

AGND

V–

f/64

f

CLK

VDD

EN

RESET

Q1

Q4

Q2

Q3

Q3 CD4520 Q2

Q4

Q1

RESET

EN

VSS

CLK

TO

OSCILLOSCOPE

CLOCK IN

1MHz MAX

LTC1293 F23

Figure 23. “Quick Look” Circuit for the LTC1294/6

CLK

CS

DOUT

NULL

BIT

MSB LSB

(B11) (B0)

FILLS

ZEROES

VERTICAL: 5V/DIV

HORIZONTAL: 2µs/DIV

Figure 24. Scope Trace of the

LTC1294/6 “Quick Look” Circuit

Showing A/D Output

101010101010 (AAAHEX)

TYPICAL APPLICATI S

Digitally Linearized Platinum RTD Signal Conditioner

+15V

LT1027

5VOUT

10µF

12k*

12.5k*

500k

400°C TRIM

+15V

+

A1

LT1101

– A=10

1k*

Rplat.

* TRW-IRC MAR-6 RESISTOR – 0.1%

** 1% FILM RESISTOR

Rplat. = 1kΩ AT 0°C – ROSEMOUNT #118MF

+15V

+

A2

LT1006

–

30.1k**

1µF

3.92M**

500k

ZERO°C TRIM

1k

CH0

CH1

CH2

DVCC

AVCC

CLK

CH3

CS

CH4 LTC1294 DOUT

CH5

DIN

CH6

REF+

CH7

REF –

COM

DGND

AGND

V–

22µF

TANTALUM

TO/FROM

68HC11

PROCESSOR

LTC1293 TA03

25

Share Link: