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OP97FP Datasheet(PDF) 9 Page - Analog Devices |
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OP97FP Datasheet(HTML) 9 Page - Analog Devices |
9 / 12 page REV. D OP97 –9– The digitally programmable gain amplifier shown in Figure 10 has 12-bit gain resolution with 10-bit gain linearity over the range of –1 to –1024. The low bias current of the OP97 main- tains this linearity, while C1 limits the noise voltage bandwidth allowing accurate measurement down to microvolt levels. DIGITAL IN GAIN (Av) 4095 –1.00024 2048 –2 1024 –4 512 –8 256 –16 128 –32 64 –64 32 –128 16 –256 8 –512 4 –1024 2 –2048 1 –4096 0 OPEN LOOP Many high-speed amplifiers suffer from less-than-perfect low- frequency performance. A combination amplifier consisting of a high precision, slow device like the OP97 and a faster device such as the OP44 results in uniformly accurate performance from dc to the high frequency limit of the OP44, which has a gain-bandwidth product of 23 MHz. The circuit shown in Figure 11 accomplishes this, with the OP44 providing high frequency amplification and the OP97 operating on low frequency signals and providing offset correction. Offset voltage and drift of the circuit are controlled by the OP97. VOUT OP97 2 3 6 0.1 F +15V C1 220pF 17 16 PM7541 VREF RFB 1 2 3 18 2.5mV TO 10V RANGE DEPENDING ON GAIN SETTING VIN –15V 0.1 F +15V IOUT 1 IOUT 2 0.1 F Figure 10. Precision Programmable Gain Amplifier OP44 VOUT 2 3 6 OP97 2 3 6 R2 20k 5 10k 1 F R1 2k VIN 0.1 F 10k 5pF R2 R1 AV = Figure 11. Combination High-Speed, Precision Amplifier Figure 12. Combination Amplifier Transient Response . |
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