AD9040A

REV. B

–4–

PIN FUNCTION DESCRIPTIONS

Pin No.

Name

Function

1, 12, 21

5 V Power Supply

2, 4, 11, 14, 22

GND

Ground

3, 10

Analog +5 V Power Supply

Internal Bandgap Voltage

Reference (Nominally +2.5 V)

Noninverting Input to Reference

Amplifier. Voltage reference for

ADC is connected here.

External Connection for (0.1

µF)

Reference Bypass Capacitor

8

NC

No Connection Internally

9

ENCODE Encode Clock Input to ADC.

Internal T/H placed in hold mode

(ADC is encoding) on rising edge.

13

Noninverting Input to T/H

Amplifier

15

OR

Out-of-Range Condition Output.

Active high when analog input

exceeds input range of ADC by

1 LSB (<FS –1 LSB or >+FS

+ 1 LSB).

16

D9 (MSB) Most Significant Bit of ADC

Output; TTL/CMOS Compatible

17–20

D8–D5

Digital Output Bits of ADC; TTL/

CMOS Compatible

23

Digital +5 V Power Supply

24–27

D4–D1

Digital Output Bits of ADC;

TTL/CMOSL Compatible

28

D0 (LSB)

Least Significant Bit of ADC

Output; TTL/CMOS Compatible

TOP VIEW

(Not to Scale)

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

AD9040A

NC = NO CONNECT

GND

GND

ENCODE

NC

GND

GND

OR

D9 (MSB)

D8

D7

D6

D5

D0 (LSB)

D1

D2

D3

GND

D4

PDIP and SOIC Pinouts

ENCODE

GND

NC

D7

D6

D5

D4

D3

D2

DGND

DIE LAYOUT AND MECHANICAL INFORMATION

Die Dimensions . . . . . . . . . . . . . . . . . 204

× 185 × 21 (±1) mils

Pad Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

× 4 mils

Metalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aluminum

Backing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . None

Transistor Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5,070

Passivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oxynitride

Die Attach (JN/JR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . Epoxy

Bond Wire (JN/JR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gold

N

N + 1

#2

#3

ENCODE

N – 3

N – 2

N – 1

DIGITAL

OUTPUTS

APERTURE DELAY

PULSEWIDTH HIGH

PULSEWIDTH LOW

OUTPUT PROP DELAY

1.9

10ns

10

7.5

100

12

MIN

TYP

MAX

10

100

Figure 1. Timing Diagram