OP-27

The OP-27 precision operational amplifier combines the low offset and drift of the OP-07 with both high speed and low noise. Offsets down to 25V and drift of 0.6V/°C maximum make the OP-27 ideal for precision instrumentation applications. Exceptionally low noise, en=3.5nV/(Hz)^1/2, at10Hz, a low 1/f noise cornerfrequency of 2.7Hz, and high gain (1.8 million), allow accurate high-gain amplification of low-level signals. A gain-bandwldth product of BMHz and a 2.8V/sec slew rate provides excellent dynamic accuracy in high-speed data-acquisition systems. A low input bias current of±10nA is achieved by use of a bias-current-cancellation circuit. Over the military temperature range, this circuit typically holds lB and lOS to ±20nA and 15nA respectively. The output stage has good load driving capability. A guaranteed swing of ±10V into 600 and low outputdistortion make the OP-27 an excellent choice for professional audio applications. PSRR and CMRR exceed 12DdB. These charecteristics, coupled with long-term drift of 0.2V/month, allow the circuit designer to achieve performance levels previously attained only by discrete designs. Low cost, high-volume production of OP-27 is achieved by using an on-chip zener-zap trimming network. This reliable and stable offset trimming scheme hes proved its effectiveness over many years of production history. The OP-27 provides excellent performance in low-noise high-accuracy amplification of low-level signals. Applications include stable integrators, precision summing amplifiers. precision voltage-threshold detectors, comparators. and professional audio clrcults such as tape-head and microphone preamplitiers. The OP-27 Is adlrect replacementfor725, OP-06, OP-07 and OP-05 amplifiers; 741 types may be directly replaced by
removing the 741's nulling potentiometer.

The features of OP-27 can be summarized as (1)low noise: 84nVp-p(0.1Hz to 10Hz), 3nV/(Hz)^1/2; (2)low drift A: 0.2V/°C; (3)high speed: 2.8V/s slew rate 8MHz gain bandwidth; (4)low VOS: 10V; (5)Excellent CMRR: 125dB at VCM of ±11V; (6)high open-leap gain: 1.8Million; (7)fits 725, OF-07, OP-05, AD510, AD517, 5534A sockets; (8)available in die form.

The absolute maximum ratings of OP-27 are (1)supply voltage: ±22V ; (2)input voltage (Note 1): ±22V ; (3)output short-circuit duratlon: indeinite ; (4)differential input voltage (Note 2): ±0.7V ; (5)differential input current (Note 2): ±25mA ; (6)storage temperature range: -65°C to +150°C; (7)operating temperature range OP-27A, OP-27B, OP-27C(J, Z, RC): -55°C to +125°C, OP-27E, OP-27F(J, Z): -25°C to +85°C, OP-27E, OP-27F(P): 0°C to +70°C, OP-27G(P, S, J, Z): -40°C to +85°C; (8)lead temperature range (soldering, 60sec): 300°C ; (9)junction temperature: -65°C to +150°C.