ADL5303 View Datasheet(PDF) - Analog Devices

Part Name

Description

MFG CO.

ADL5303

160 dB Range 100 pA to 10 mA Low Cost Logarithmic Converter

Analog Devices 

Data Sheet

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

ADL5303

NC 1

VSUM 2

INPT 3

VSUM 4

PIN 1

INDICATOR

ADL5303

TOP VIEW

(Not to Scale)

12 VPS1

11 VOUT

10 VPS2

9 BFIN

NOTES

1. PINS LABELED NC CAN BE ALLOWED TO FLOAT, BUT

IT IS BETTER TO CONNECT THESE PINS TO GROUND.

AVOID ROUTING HIGH SPEED SIGNALS THROUGH

THESE PINS BECAUSE NOISE COUPLING MAY RESULT.

2. EXPOSED PAD. CONNECT THE EXPOSED PAD TO THE

VSUM PINS TO PROVIDE LOW LEAKAGE GUARD.

Figure 2. Pin Configuration

Table 3. Pin Function Descriptions

Pin No. Mnemonic Description

1

NC

Pins labeled NC can be allowed to float, but it is better to connect these pins to ground. Avoid routing high

speed signals through these pins because noise coupling may result.

2, 4

VSUM

Guard Pins. VSUM is used to shield the INPT current line.

3

INPT

Photodiode Current Input. Connect this pin to the photodiode anode (the photo current flows toward INPT).

5

VPDB

Photodiode Biaser Output. Connect this pin to the photodiode cathode when using adaptive bias control;

otherwise, leave this pin floating.

6

VREF

Voltage Reference Output of 2 V.

7

ACOM

Analog Reference Ground.

8

VLOG

Output of the Logarithmic Front-End Processor. ROUT = 5 kΩ to ground.

9

BFIN

Buffer Amplifier Noninverting Input (High Impedance).

10

VPS2

Positive Supply, VPS (3.0 V to 5.5 V).

11

VOUT

Buffer Output; Low Impedance.

12

VPS1

Positive Supply, VPS (3.0 V to 5.5 V).

13

BFNG

Buffer Amplifier Inverting Input.

14, 15

GND

Power Supply Ground Connection.

16

PWDN

Power-Down Control Input. Device is active when PWDN is taken low.

17

EPAD

Exposed Pad. Connect the exposed pad to the VSUM pins to provide low leakage guard.

Rev. 0 | Page 5 of 24

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