AD8305 datasheet(3/20 Pages) AD

Part #	AD8305

Description	100 dB Range (10 nA to 1 mA) Logarithmic Converter

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Manufacturer	AD [Analog Devices]

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REV. A

AD8305

–3–

ABSOLUTE MAXIMUM RATINGS

1

Supply Voltage VP – VN . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 V

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

Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . 500 mW

JA

2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

∞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

NOTES

1 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.

2 With package die paddle soldered to thermal pad containing nine vias connected

to inner and bottom layers.

PIN CONFIGURATION

AD8305

12 VOUT

11 SCAL

10 BFIN

9 VLOG

VRDZ 1

VREF 2

IREF 3

INPT 4

PIN 1

INDICATOR

TOP VIEW

PIN FUNCTION DESCRIPTIONS

Pin No.

Mnemonic

Function

1

VRDZ

Top of a Resistive Divider Network that Offsets VLOG to Position the Intercept. Normally connected

to VREF; may also be connected to ground when bipolar outputs are to be provided.

2

VREF

Reference Output Voltage of 2.5 V.

3IREF

Accepts (Sinks) Reference Current, IREF.

4INPT

Accepts (Sinks) Photodiode Current, IPD. Usually connected to photodiode anode such that photo

current flows into INPT.

5

VSUM

Guard Pin. Used to shield the INPT current line and for optional adjustment of the INPT and IREF

node potential.

6, 7

VNEG

Optional Negative Supply, VN. (This pin is usually grounded; for details of usage, see the Applications section).

8

VPOS

Positive Supply, (VP – VN )

£ 12 V.

9

VLOG

Output of the Logarithmic Front End.

10

BFIN

Buffer Amplifier Noninverting Input.

11

SCAL

Buffer Amplifier Inverting Input.

12

VOUT

Buffer Output.

13–16

COMM

Analog Ground.

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

AD8305 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.

ORDERING GUIDE

Temperature

Package

Model

Range

Description

Option

AD8305ACP

–40

∞C to +85∞C

16-Lead LFCSP CP-16

AD8305ACP-REEL7 7" Tape and Reel

AD8305-EVAL

Evaluation Board

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