AD640

REV.

D

–4–

CHIP DIMENSIONS AND

BONDING DIAGRAM

Dimensions shown in inches and (mm).

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±7.5 V

Input Voltage (Pin 1 or Pin 20 to COM) . . . . –3 V to +300 mV

Attenuator Input Voltage (Pin 5 to Pin 3/4) . . . . . . . . . . .

±4 V

Storage Temperature Range D, E . . . . . . . . . –65

°C to +150°C

Storage Temperature Range N, P . . . . . . . . . –65

°C to +125°C

Ambient Temperature Range, Rated Performance

Industrial, AD640B . . . . . . . . . . . . . . . . . . . –40

°C to +85°C

Military, AD640T . . . . . . . . . . . . . . . . . . . –55

°C to +125°C

Commercial, AD640J . . . . . . . . . . . . . . . . . . . 0

°C to +70°C

Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300

°C

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the

device at these or any other conditions above those indicated in the operational

section of this specification is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect device reliability.

(continued from page 1)

6. The low input offset voltage of 50

µV (200 µV max) ensures

good accuracy for low level dc inputs.

7. Thermal recovery “tails,” which can obscure the response

when a small signal immediately follows a high level input,

have been minimized by special attention to design details.

8. The noise spectral density of 2 nV/

√Hz results in a noise floor of

~23

µV rms (–80 dBm) at a bandwidth of 100 MHz. The dy-

namic range using cascaded AD640s can be extended to 95 dB

by the inclusion of a simple filter between the two devices.

ESD CAUTION

CONNECTION DIAGRAMS

20-Lead PLCC (P) Package

20-Terminal Ceramic LCC (E) Package

20-Lead Ceramic

SBDIP (D) Package

20-Lead Plastic DIP (N) Package

9

10

11

12

13

3

2

1

20

19

18

17

16

15

14

4

5

6

7

8

TOP VIEW

(Not to Scale)

PIN 1

IDENTIFIER

AD640

ATN COM

CKT COM

RG1

RG0

RG2

LOG OUT

ATN IN

BL1

–VS

ITC

TOP VIEW

(Not to Scale)

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

9

10

AD640

SIG –OUT

BL2

ITC

ATN LO

ATN COM

ATN COM

–VS

BL1

ATN IN

SIG –IN

SIG +IN

ATN OUT

CKT COM

RG1

RG0

RG2

LOG OUT

LOG COM

+VS

SIG +OUT

20 19

1

2

3

18

14

15

16

17

4

5

6

7

8

9

1011 1213

TOP VIEW

(Not to Scale)

AD640

ATN COM

CKT COM

RG1

RG0

RG2

LOG OUT

ATN IN

BL1

–VS

ITC