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AD8610AR Datasheet(PDF) 9 Page - Analog Devices |
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AD8610AR Datasheet(HTML) 9 Page - Analog Devices |
9 / 20 page REV. D AD8610/AD8620 –9– TIME – 400ns/DIV VS = 13V VIN p-p = 20V AV = 1 RL = 2k SR = 55V/ s CL = 20pF TPC 37. +SR at G = –1 TIME – 400ns/DIV VS = 13V VIN p-p = 20V AV = 1 RL = 2k SR = 50V/ s CL = 20pF TPC 38. –SR at G = –1 + – VIN 20V p-p 0 3 2 U1 +13V –13V 2k R4 2k 0 0 2k R1 20k R2 0 0 U2 5 6 7 V+ V– V– V+ CS(dB) = 20 log (VOUT / 10 VIN) Figure 1. Channel Separation Test Circuit FUNCTIONAL DESCRIPTION The AD8610/AD8620 is manufactured on Analog Devices, Inc.’s proprietary XFCB (eXtra Fast Complementary Bipolar) process. XFCB is fully dielectrically isolated (DI) and used in conjunc- tion with N-channel JFET technology and trimmable thin-film resistors to create the world’s most precise JFET input amplifier. Dielectrically isolated NPN and PNP transistors fabricated on XFCB have FT greater than 3 GHz. Low TC thin film resistors enable very accurate offset voltage and offset voltage tempco trimming. These process breakthroughs allowed Analog Devices’ world class IC designers to create an amplifier with faster slew rate and more than 50% higher bandwidth at half of the current consumed by its closest competition. The AD8610 is uncondi- tionally stable in all gains, even with capacitive loads well in excess of 1 nF. The AD8610B achieves less than 100 µV of offset and 1 µV/°C of offset drift, numbers usually associated with very high precision bipolar input amplifiers. The AD8610 is offered in the tiny 8-lead MSOP as well as narrow 8-lead SOIC surface- mount packages and is fully specified with supply voltages from ±5 V to ±13 V. The very wide specified temperature range, up to 125 °C, guarantees superior operation in systems with little or no active cooling. The unique input architecture of the AD8610 features extremely low input bias currents and very low input offset voltage. Low power consumption minimizes the die temperature and maintains the very low input bias current. Unlike many competitive JFET amplifiers, the AD8610/AD8620 input bias currents are low even at elevated temperatures. Typical bias currents are less than 200 pA at 85 °C. The gate current of a JFET doubles every 10°C resulting in a similar increase in input bias current over temperature. Special care should be given to the PC board layout to minimize leakage currents between PCB traces. Improper layout and board handling generates leakage current that exceeds the bias current of the AD8610/AD8620. FREQUENCY – kHz 0 350 50 100 150 200 250 300 138 136 120 128 126 124 122 132 130 134 Figure 2. AD8620 Channel Separation Graph Power Consumption A major advantage of the AD8610/AD8620 in new designs is the saving of power. Lower power consumption of the AD8610 makes it much more attractive for portable instrumentation and for high-density systems, simplifying thermal management, and reducing power supply performance requirements. Compare the power consumption of the AD8610/AD8620 versus the OPA627 in Figure 3. TEMPERATURE – C 8 7 6 5 4 3 2 –75 125 –50 –25 0 25 50 75 100 OPA627 AD8610 Figure 3. Supply Current vs. Temperature |
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