1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

AINP

AINN

RESETPWDN

/

START

SYNCOUT

CS

SCLK

DIN

DOUT

DRDY

AVDD

AVSS

REFN

REFP

REFOUT

DVDD

DGND

BYPASS

XTAL2

XTAL1/CLKIN

ADS1259-Q1

www.ti.com

SLASE20 – MARCH 2014

5 Terminal Configuration and Functions

20-Terminal TSSOP

PW Package

(Top View)

Terminal Functions

TERMINAL

TYPE

DESCRIPTION

NO.

NAME

1

AINP

Analog input

Positive analog input

2

AINN

Analog input

Negative analog input

3

RESET/PWDN

Digital input

Reset or power down; reset is active-low; hold low for power down.

4

START

Digital input

Start conversions, active-high

5

SYNCOUT

Digital output

6

CS

Digital input

SPI chip-select, active-low

7

SCLK

Digital input

SPI clock input

8

DIN

Digital input

SPI data input

9

DOUT

Digital output

SPI data output

10

DRDY

Digital output

Data-ready output, active-low

Internal oscillator: DGND

11

XTAL1/CLKIN

Digital input

External clock: clock input

Crystal oscillator: external crystal1

12

XTAL2

Digital

External crystal2, otherwise no connection

13

BYPASS

Analog

Core voltage bypass. Connect a 1-µF capacitor to DGND.

14

DGND

Digital

Digital ground

15

DVDD

Digital

Digital power supply

16

REFOUT

Analog output

17

REFP

Analog input

(1)

18

REFN

Analog input

19

AVSS

Analog

Negative analog power supply and negative internal reference output

20

AVDD

Analog

Positive analog power supply

(1)

Leave unused reference inputs unconnected or tie to AVDD.

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