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OP271 Arkusz danych(PDF) 9 Page - Analog Devices |
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OP271 Arkusz danych(HTML) 9 Page - Analog Devices |
9 / 12 page REV. A OP271 –9– FREQUENCY RATIO – 1/ / –7 0.001 0 0.01 0.005 0.005 0.1 1.0 0.5 –6 –5 –4 –3 –2 –1 SINGLE OP AMP, CONVENTIONAL DESIGN CASCADED (TWO STAGES) LOW PHASE ERROR AMPLIFIER 1/2 OP271FZ 1/2 OP271FZ VIN IOUT 11mA R3 10k R1 10k IOUT = VIN RS VIN 100 = =10mA/V R5 100 R2 10k +15V –15V R4 10k 1 2 3 4 5 6 7 8 VOUTA RFBB VDD –15V 0.1 F AGND 10pF 10 F VOUTB +15V 10 F 0.1 F 10pF IOUTA IOUTB RFBA DGND 5V 10V VREFA VREFB DAC A/DAC B LDAC WR DAC CONTROL REFERENCE VOLTAGE DAC-8222EW DAC A DAC B 1/2 OP271EZ 1/2 OP271EZ 1 2 3 4 5 6 7 8 18 19 20 21 22 23 24 4 2 3 + + – – 12-BIT DATABUS PINS 6–17 Figure 5. Phase Error Comparison Figure 5 compares the phase error performance of the low phase error amplifier with a conventional single op amp amplifier and a cascaded two-stage amplifier. The low phase error amplifier shows a much lower phase error, particularly for frequencies where T<0.1. For example, phase error of -0.1 occurs at 0.002 T for the single op amplifier, but at 0.11 T for the low phase error amplifier. For more detailed information on the low phase error amplifier, see Application Note AN-107. Figure 6. Dual 12-Bit Voltage Output DAC Dual 12-Bit Voltage Output DAC The dual voltage output DAC shown in Figure 6 will settle to 12-bit accuracy from zero to full scale in 2 s typically. The CMOS DAC-8222 utilizes a 12-bit, double-buffered input structure allowing faster digital throughput and minimizing digital feedback. Fast Current Pump Maximum output current of the fast current pump shown in Figure 7 is 11 mA. Voltage compliance exceeds 10 V with 15 V supplies. The current pump has an output resistance of over 3 M and maintains 12-bit linearity over its entire output range. Figure 7. Fast Current Pump |
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Podobny opis - OP271 |
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