AD8305 datasheet(5/24 Pages) AD

Part #	AD8305

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

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AD8305

Rev. B | Page 5 of 24

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

AD8305

12 VOUT

NOTES

1. CONNECT EPAD TO GROUND.

11 SCAL

10 BFIN

9 VLOG

VRDZ 1

VREF 2

IREF 3

INPT 4

PIN 1

INDICATOR

TOP VIEW

(Not to Scale)

Figure 2. Pin Configuration

Table 3. 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.

3

IREF

Accepts (Sinks) Reference Current, IREF.

4

INPT

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 to 16

COMM

Analog Ground.

EPAD

The exposed pad must be soldered to ground.

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