AD8305 Analog Devices, AD8305 Datasheet - Page 3

• Manufacturer Part Number: AD8305
• Description: 100 Db-range (10nA-1mA) Logarithmic Converter
• Manufacturer: Analog Devices

ABSOLUTE MAXIMUM RATINGS
Supply Voltage V
Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . 500 mW
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
2
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.
Pin No.
1
2
3
4
5
6, 7
8
9
10
11
12
13–16
REV. A
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.
With package die paddle soldered to thermal pad containing nine vias connected
to inner and bottom layers.
JA
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30∞C/W
Mnemonic
VRDZ
VREF
IREF
INPT
VSUM
VNEG
VPOS
VLOG
BFIN
SCAL
VOUT
COMM
P
– V
N
. . . . . . . . . . . . . . . . . . . . . . . . . . . 12 V
Function
Top of a Resistive Divider Network that Offsets V
to VREF; may also be connected to ground when bipolar outputs are to be provided.
Reference Output Voltage of 2.5 V.
Accepts (Sinks) Reference Current, I
Accepts (Sinks) Photodiode Current, I
current flows into INPT.
Guard Pin. Used to shield the INPT current line and for optional adjustment of the INPT and I
node potential.
Optional Negative Supply, V
Positive Supply, (V
Output of the Logarithmic Front End.
Buffer Amplifier Noninverting Input.
Buffer Amplifier Inverting Input.
Buffer Output.
Analog Ground.
1
PIN FUNCTION DESCRIPTIONS
P
– V
VRDZ 1
VREF 2
IREF 3
INPT 4
PIN CONFIGURATION
N
) £ 12 V.
N
. (This pin is usually grounded; for details of usage, see the Applications section).
AD8305
TOP VIEW
PIN 1
INDICATOR
–3–
REF.
Model
AD8305ACP
AD8305ACP-REEL7 7" Tape and Reel
AD8305-EVAL
PD
. Usually connected to photodiode anode such that photo
12 VOUT
11 SCAL
10 BFIN
9 VLOG
LOG
to Position the Intercept. Normally connected
Temperature
Range
–40∞C to +85∞C
Evaluation Board
ORDERING GUIDE
Package
Description
16-Lead LFCSP CP-16
AD8305
Package
Option
REF