AD9050

–4–

REV. B

Table I. AD9050 Digital Coding (Single Ended Input AIN, AINB Bypassed to GND)

OR

Digital Output

Analog Input

Voltage Level

(Out of Range)

MSB . . . LSB

3.813

Positive Full Scale + 1 LSB

1

1111111111

3.300

Midscale

0

0111111111

2.787

Negative Full Scale – 1 LSB

1

0000000000

PIN FUNCTION DESCRIPTIONS

Pin No

Name

Function

1, 7, 12, 21, 23

GND

Ground.

2, 8, 11

Analog +5 V

± 5% power supply.

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

OR

Out of range signal. Logic “0” when analog input is in nominal range. Logic “1” when

analog input is out of nominal range.

15

D9 (MSB)

Most significant bit of ADC output.

16–19

D8–D5

Digital output bits of ADC.

20, 22

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

24–27

D4–D1

Digital output bits of ADC.

28

D0 (LSB)

Least significant bit of ADC output.

PIN CONFIGURATION

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)

AD9050

GND

D3

D2

D1

D0 (LSB)

GND

D4

COMP

GND

AINB

AIN

D5

GND

GND

ENCODE

OR

D6

D9 (MSB)

D8

D7

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 AD9050 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.