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AD8620BR 数据表(PDF) 13 Page - Analog Devices |
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AD8620BR 数据表(HTML) 13 Page - Analog Devices |
13 / 24 page AD8610/AD8620 Rev. E | Page 13 of 24 THEORY OF OPERATION + – VIN 20V p-p 0 3 2 U1 +13V –13V R4 2kΩ R2 2kΩ R1 20kΩ R3 2kΩ 0 0 0 0 U2 5 6 7 V+ V– V– V+ CS (dB) = 20 log (VOUT / 10 × VIN) Figure 41. Channel Separation Test Circuit FUNCTIONAL DESCRIPTION The AD8610/AD8620 are manufactured on Analog Devices, Inc.'s XFCB (eXtra fast complementary bipolar) process. XFCB is fully dielectrically isolated (DI) and used in conjunction with N-channel JFET technology and thin film resistors (that can be trimmed) to create the JFET input amplifier. Dielectrically iso- lated NPN and PNP transistors fabricated on XFCB have an FT greater than 3 GHz. Low TC thin film resistors enable very accurate offset voltage and offset voltage tempco trimming. These process breakthroughs allow Analog Devices’ IC designers to create an amplifier with faster slew rate and more than 50% higher band- width at half of the current consumed by its closest competition. The AD8610/AD8620 are unconditionally stable in all gains, even with capacitive loads well in excess of 1 nF. The AD8610/ AD8620B grade 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/AD8620 features extremely low input bias currents and very low input offset volt- age. Low power consumption minimizes the die temperature and maintains the very low input bias current. Unlike many com- petitive 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. Give special care to the PC board layout to minimize leakage currents between PCB traces. Improper lay- out and board handling generates a leakage current that exceeds the bias current of the AD8610/AD8620. 138 136 120 128 126 124 122 132 130 134 FREQUENCY (kHz) 0 100 150 200 50 250 300 350 Figure 42. AD8620 Channel Separation Graph 8 7 2 6 5 4 3 TEMPERATURE (°C) –75 –25 0 25 –50 50 75 100 125 OPA627 AD8610 Figure 43. Supply Current vs. Temperature Power Consumption A major advantage of the AD8610/AD8620 in new designs is the power saving capability. Lower power consumption of the AD8610/AD8620 makes them much more attractive for portable instrumentation and for high density systems, simplifying ther- mal management, and reducing power-supply performance requirements. Compare the power consumption of the AD8610 vs. the OPA627 in Figure 43. |
类似零件编号 - AD8620BR |
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类似说明 - AD8620BR |
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