AD9049

REV. A

–4–

Table I. AD9049 Digital Coding (Single Ended Input AIN, AINB Bypassed to GND)

Digital Output

Analog Input

Voltage Level

MSB . . . LSB Digital Output

3.810

Positive Full Scale

111111111

3.300

Midscale

011111111

2.790

Negative Full Scale

000000000

PIN DESCRIPTIONS

Pin No

Name

Function

1, 7, 12, 21, 23

GND

Ground.

2, 8, 11

Analog +5 V

± 5% power supply.

3

Internal bandgap voltage reference (nominally +2.5 V).

4

Input to reference amplifier. Voltage reference for ADC is connected here.

5

COMP

Internal compensation pin, 0.1

µF bypass connected here to V

6

External connection for (0.1

µF) reference bypass capacitor.

9

AINB

Complementary analog input pin (Analog input bar).

10

AIN

Analog input pin.

13

ENCODE

Encode clock input to ADC. Internal T/H is placed in hold mode (ADC is encoding)

on rising edge of encode signal.

14

NC

Not internally connected.

15

D8 (MSB)

Most significant bit of ADC output.

16–19

D7–D4

Digital output bits of ADC.

20, 22

Digital output power supply (only used by digital outputs).

24–26

D3–D1

Digital output bits of ADC.

27

D0 (LSB)

Least significant bit of ADC output.

28

NC

Not internally connected.

PIN CONNECTIONS

14

13

12

11

10

9

8

1

2

3

4

7

6

5

17

16

15

20

19

18

28

27

26

25

24

23

22

21

TOP VIEW

(Not to Scale)

AD9049

GND

D2

D1

D0 (LSB)

NC

GND

D3

COMP

GND

AINB

AIN

D4

GND

GND

ENCODE

NC

D5

D8 (MSB)

D7

D6

NC = NO CONNECT

WARNING!

ESD SENSITIVE DEVICE

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection.

Although the AD9049 features proprietary ESD protection circuitry, permanent damage may

occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD

precautions are recommended to avoid performance degradation or loss of functionality.