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OP200EZ Arkusz danych(PDF) 9 Page - Analog Devices |
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OP200EZ Arkusz danych(HTML) 9 Page - Analog Devices |
9 / 12 page REV. A OP200 –9– PRECISION ABSOLUTE VALUE AMPLIFIER The circuit of Figure 5 is a precision absolute value amplifier with an input impedance of 10 M W. The high gain and low TCVOS of the OP200 ensure accurate operation with microvolt input signals. In this circuit, the input always appears as a common-mode signal to the op amps. The CMR of the OP200 exceeds 120 dB, yielding an error of less than 2 ppm. 1/2 OP200AZ VOUT 1/2 OP200AZ 7 6 5 VIN 3 2 0V < VOUT < 10V 1 R1 1k R3 1k C1 30pF D1 1N4148 C2 0.1pF –15 D1 1N4148 R2 2k C2 0.1pF +15 8 4 Figure 5. Precision Absolute Value Amplifier PRECISION CURRENT PUMP Maximum output current of the precision current pump shown in Figure 6 is ±10 mA. Voltage compliance is ±10 V with ±15 V supplies. Output impedance of the current transmitter exceeds 3 M W with linearity better than 16 bits. 1/2 OP200EZ 1/2 OP200EZ 5 6 VIN 3 2 1 R5 100 –15 +15 IOUT 7 R1 10k R2 10k R3 10k R4 1k IOUT = = VIN RS VIN 100 = 10mA/V 8 4 Figure 6. Precision Current Pump DUAL 12-BIT VOLTAGE OUTPUT DAC The dual output DAC shown in Figure 7 is capable of providing untrimmed 12-bit accurate operation over the entire military temperature range. Offset voltage, bias current and gain errors of the OP-200 contribute less than 1/lO of an LSB error at 12 bits over the military temperature range. OUTA VDD –15V OUTB IOUTA IOUTB RFBA AGND 5V VREFA VREFB DAC A/DAC B CS WR DAC CONTROL 10V REFERENCE VOLTAGE DAC-8222EW DAC A DAC B 1/2 OP200AZ 1/2 OP200AZ 23 2 3 4 5 6 7 8 18 19 20 21 22 1 24 4 2 3 + + – – DAC DATA BUS PINS 6(MSB) – 17(LSB) 5 1 1/2 DAC8212AV 1/2 DAC8212AV RFBB DGND Figure 7. Dual 12-Bit Voltage Output DAC |
Podobny numer części - OP200EZ |
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Podobny opis - OP200EZ |
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