TC7109A datasheet(10/32 Pages) MICROCHIP

Part #	TC7109A

Description	12-Bit ?쵡-Compatible Analog-to-Digital Converters

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Manufacturer	MICROCHIP [Microchip Technology]

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10 / 32 page

TC7109/A

DS21456D-page 10

 2002-2012 Microchip Technology Inc.

FIGURE 3-1:

Conversion Timing (RUN/HOLD) Pin High

FIGURE 3-2:

Digital Section

Internal Clock

Integrator Output

for Normal Input

Integrator

Saturates

Internal Latch

Integrator Output

for Over Range Input

No Zero Crossing

ZI

AZ

Zero Integrator

Phase forces

Integrator Output

to 0V

Zero Crossing

Occurs

Zero Crossing

Detected

INT

Phase II

Status Output

AZ

Phase I

DE

Phase III

AZ

Fixed

2048

Counts

2048

Counts

Min.

4096

Counts

Max

Number of Counts to Zero Crossing

Proportional to VIN

After Zero Crossing, Analog section will

be in Auto-Zero Configuration

TEST

17

POL

3

OR

4

B

12

5

B

11

6

B

10

7

B

9

8

B

8

9

B

7

10

B

6

11

B

5

12

B

4

13

B

3

14

226

22

23

24

25

21

STATUS

RUN/

HOLD

OSC

IN

OSC

OUT

OSC

SEL

BUFF

OSC

OUT

MODE

To

Analog

Section

COMP OUT

AZ

INT

DE (±)

ZI

Conversion

Control Logic

Oscillator and

Clock Circuitry

High Order

Byte Outputs

Low Order

Byte Outputs

Handshake

Logic

B

2

15

B

1

16

27

SEND

18

19

20

LBEN

HBEN

CE/LOAD

1

GND

14 Latches

12-Bit Counter

14 Three-State Outputs

Latch

Clock

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TC7109A Datasheet(PDF) 10 Page - Microchip Technology

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