REV. A

AD8304

–3–

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

AD8304 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.

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS

*

Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . 270 mW

JA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

°C/W

Maximum Junction Temperature . . . . . . . . . . . . . . . . 125

°C

Operating Temperature Range . . . . . . . . . . . –40

°C to +85°C

Storage Temperature Range . . . . . . . . . . . . –65

°C to +150°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.

PIN FUNCTION DESCRIPTIONS

Pin No.

Mnemonic Function

1

VNEG

pin is usually grounded; for details of

usage, see Applications section.

2PWDN

Power-Down Control Input. Device is

active when PWDN is taken LOW.

3, 5

VSUM

Guard Pins. Used to shield the INPT

current line.

4INPT

Photodiode Current Input. Usually

connected to photodiode anode (the

photo current flows toward INPT).

6

VPDB

Photodiode Biaser Output. May be

connected to photodiode cathode to

provide adaptive bias control.

7

VREF

Voltage Reference Output of 2 V

8

VLOG

Output of the Logarithmic Front-End

Ω to ground.

9

BFIN

Buffer Amplifier Noninverting Input

(High Impedance)

10

VPS2

11

VOUT

Buffer Output; Low Impedance

12

VPS1

13

BFNG

Buffer Amplifier Inverting Input

14

ACOM

Analog Ground

PIN CONFIGURATION

TOP VIEW

(Not to Scale)

AD8304

VNEG

PWDN

VSUM

INPT

VSUM

VPDB

VREF

ACOM

BFNG

VPS1

VOUT

VPS2

BFIN

VLOG

1

2

3

4

5

6

7

14

13

12

11

10

9

8

ORDERING GUIDE

Model

Temperature Range

Package Description

Package Option

AD8304ARU

–40

°C to +85°CTube, 14-Lead TSSOP

RU-14

AD8304ARU-REEL

13" Tape and Reel

AD8304ARU-REEL7

7" Tape and Reel

AD8304-EVAL

Evaluation Board