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AD629BR Datasheet(PDF) 3 Page - Analog Devices |
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AD629BR Datasheet(HTML) 3 Page - Analog Devices |
3 / 12 page REV. A AD629 –3– ABSOLUTE MAXIMUM RATINGS 1 Supply Voltage VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V Internal Power Dissipation2 DIP (N) . . . . . . . . . . . . . . . . . . . . . . . . See Derating Curves SOIC (R) . . . . . . . . . . . . . . . . . . . . . . . See Derating Curves Input Voltage Range, Continuous . . . . . . . . . . . . . . . . ±300 V Common-Mode and Differential, 10 sec . . . . . . . . . . . ±500 V Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite Pin 1, Pin 5 . . . . . . . . . . . . . . . . . . –VS – 0.3 V to +VS + 0.3 V Maximum Junction Temperature . . . . . . . . . . . . . . . . . 150 °C Operating Temperature Range . . . . . . . . . . –55 °C to +125°C Storage Temperature Range . . . . . . . . . . . . –65 °C to +150°C Lead Temperature Range (Soldering 60 sec) . . . . . . . . . 300 °C NOTES 1Stresses 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 effect device reliability. 2Specification is for device in free air: 8-Lead Plastic DIP, θ JA = 100 °C/W; 8-Lead SOIC Package, θ JA = 155 °C/W. AMBIENT TEMPERATURE – C 2.0 –50 1.5 1.0 0.5 0 8-LEAD MINI-DIP PACKAGE –40 –30 –20 –10 0 102030 405060 708090 8-LEAD SOIC PACKAGE TJ = 150 C Figure 3. Derating Curve of Maximum Power Dissipation vs. Temperature for SOIC and PDIP Packages 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 AD629 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. WARNING! ESD SENSITIVE DEVICE THEORY OF OPERATION The AD629 is a unity gain differential-to-single-ended amplifier (Diff Amp) that can reject extremely high common-mode signals (in excess of 270 V with 15 V supplies). It consists of an operational amplifier (Op Amp) and a resistor network. In order to achieve high common-mode voltage range, an internal resistor divider (Pin 3, Pin 5) attenuates the noninverting signal by a factor of 20. Other internal resistors (Pin 1, Pin 2, and the feedback resistor) restores the gain to provide a differential gain of unity. The complete transfer function equals: VOUT = V (+IN ) – V (–IN ) Laser wafer trimming provides resistor matching so that common- mode signals are rejected while differential input signals are amplified. The op amp itself, in order to reduce output drift, uses super beta transistors in its input stage The input offset current and its associated temperature coefficient contribute no appreciable output voltage offset or drift. This has the added benefit of reducing voltage noise because the corner where 1/f noise becomes dominant is below 5 Hz. In order to reduce the dependence of gain accuracy on the op amp, the open-loop voltage gain of the op amp exceeds 20 million, and the PSRR exceeds 140 dB. 1 2 3 4 8 7 6 5 21.1k 380k 380k 380k 20k REF(–) –IN +IN –VS NC +VS OUTPUT REF(+) AD629 NC = NO CONNECT Figure 4. Functional Block Diagram ORDERING GUIDE Temperature Package Package Model Range Description Option AD629AR –40 °C to +85°C 8-Lead Plastic SOIC SO-8 AD629AR-REEL 1 –40 °C to +85°C 8-Lead Plastic SOIC SO-8 AD629AR-REEL7 2 –40 °C to +85°C 8-Lead Plastic SOIC SO-8 AD629BR –40 °C to +85°C 8-Lead Plastic SOIC SO-8 AD629BR-REEL 1 –40 °C to +85°C 8-Lead Plastic SOIC SO-8 AD629BR-REEL7 2 –40 °C to +85°C 8-Lead Plastic SOIC SO-8 AD629AN –40 °C to +85°C 8-Lead Plastic DIP N-8 AD629BN –40 °C to +85°C 8-Lead Plastic DIP N-8 NOTES 113" Tape and Reel of 2500 each 27" Tape and Reel of 1000 each |
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