DDC112_14 datasheet(4/35 Pages) TI1

Part #	DDC112

Description	Dual Current Input 20-Bit ANALOG-TO-DIGITAL CONVERTER

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Manufacturer	TI1 [Texas Instruments]

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DDC112

4

SBAS085B

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PIN DESCRIPTIONS

LABEL

DESCRIPTION

1

IN1

Input 1: analog input for Integrators 1A and 1B. The

integrator that is active is set by the CONV input.

2

AGND

Analog Ground

3

CAP1B

External Capacitor for Integrator 1B

4

CAP1B

External Capacitor for Integrator 1B

5

CAP1A

External Capacitor for Integrator 1A

6

CAP1A

External Capacitor for Integrator 1A

7AVDD

Analog Supply, +5V Nominal

8

TEST

Test Control Input. When HIGH, a test charge is applied

to the A or B integrators on the next CONV transition.

9

CONV

Controls which side of the integrator is connected to

input. In continuous mode; CONV HIGH

→ side A is

integrating, CONV LOW

→ side B is integrating. CONV

must be synchronized with CLK (see Figure 2).

10

CLK

System Clock Input, 10MHz Nominal

11

DCLK

Serial Data Clock Input. This input operates the serial I/

O shift register.

12

DXMIT

Serial Data Transmit Enable Input. When LOW, this

input enables the internal serial shift register.

13

DIN

Serial Digital Input. Used to cascade multiple DDC112s.

14

DVDD

Digital Supply, +5V Nominal

15

DGND

Digital Ground

16

DOUT

Serial Data Output, Hi-Z when DXMIT is HIGH

17

DVALID

Data Valid Output. A LOW value indicates valid data is

available in the serial I/O register.

18

RANGE0

Range Control Input 0 (least significant bit)

19

RANGE1

Range Control Input 1

20

RANGE2

Range Control Input 2 (most significant bit)

21

AGND

Analog Ground

22

VREF

External Reference Input, +4.096V Nominal

23

CAP2A

External Capacitor for Integrator 2A

24

CAP2A

External Capacitor for Integrator 2A

25

CAP2B

External Capacitor for Integrator 2B

26

CAP2B

External Capacitor for Integrator 2B

27

AGND

Analog Ground

28

IN2

Input 2: analog input for Integrators 2A and 2B. The

integrator that is active is set by the CONV input.

PIN CONFIGURATION

Top View

SO

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

IN2

AGND

CAP2B

CAP2A

V

REF

AGND

RANGE2 (MSB)

RANGE1

RANGE0 (LSB)

DVALID

DOUT

DGND

IN1

AGND

CAP1B

CAP1A

AV

DD

TEST

CONV

CLK

DCLK

DXMIT

DIN

DV

DD

DDC112U

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