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AD8305 Datasheet(PDF) 3 Page - Analog Devices |
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AD8305 Datasheet(HTML) 3 Page - Analog Devices |
3 / 20 page 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 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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