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OP727ARZ Datasheet(PDF) 10 Page - Analog Devices |
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OP727ARZ Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page REV. OP777/OP727/OP747 –10– TEMPERATURE – C 14.944 60 40 140 20 0 20 40 60 80 100 120 14.946 14.948 14.950 14.954 14.956 14.958 14.960 14.962 14.964 VSY = 15V IL = 1mA 14.952 TPC 46. Output Voltage High vs. Temperature TEMPERATURE – C 14.960 60 40 140 VSY = 15V IL = 1mA 20 0 20 40 60 80 100 120 14.955 14.950 14.945 14.935 14.930 14.940 TPC 47. Output Voltage Low vs. Temperature TIME – Minutes 1.5 0 1.5 0 0.5 5.0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 1.0 0.5 0.5 1.0 VSY = 15V VCM = 0V TA = 25 C TPC 48. Warm-Up Drift BASIC OPERATION The OP777/OP727/OP747 amplifier uses a precision Bipolar PNP input stage coupled with a high-voltage CMOS output stage. This enables this amplifier to feature an input voltage range which includes the negative supply voltage (often ground- in single-supply applications) and also swing to within 1 mV of the output rails. Additionally, the input voltage range extends to within 1 V of the positive supply rail. The epitaxial PNP input structure provides high breakdown voltage, high gain, and an input bias cur- rent figure comparable to that obtained with a “Darlington” input stage amplifier but without the drawbacks (i.e., severe penalties for input voltage range, offset, drift and noise). The PNP input structure also greatly lowers the noise and reduces the dc input error terms. Supply Voltage The amplifiers are fully specified with a single 5 V supply and, due to design and process innovations, can also operate with a supply voltage from V up to 30 V. This allows operation from most split supplies used in current industry practice, with the advantage of substantially increased input and output voltage ranges over conventional split-supply amplifiers. The OP777/OP727/OP747 series is specified with (VSY = 5 V, V– = 0 V and VCM = 2.5 V which is most suitable for single-supply application. With PSRR of 130 dB (0.3 μV/V) and CMRR of 110 dB (3 μV/V) offset is mini- mally affected by power supply or common-mode voltages. Dual supply, ±15 V operation is also fully specified. Input Common-Mode Voltage Range The OP777/OP727/OP747 is rated with an input common-mode voltage which extends from the minus supply to within 1 V of the positive supply. However, the amplifier can still operate with input voltages slightly below VEE. In Figure 2, OP777/OP727/OP747 is configured as a difference amplifier with a single supply of V and negative dc common-mode voltages applied at the inputs terminals. A 400 mV p-p input is then applied to the noninverting input. It can be seen from the graph below that the output does not show any distortion. Micropower operation is maintained by using large input and feedback resistors. Figure 1. Input and Output Signals with VCM < 0 V +3V OP777/ OP727/ OP747 100k 100k 100k 100k 0.1V VIN = 1kHz at 400mV p-p 0.27V Figure 2. OP777/OP727/OP747 Configured as a Differ- ence Amplifier Operating at VCM < 0 V D 3.0 3.0 TIME – 0.2ms/DIV VIN 0V VOUT |
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