ANALOG DEVICES Low Noise, Precision Operational Amplifier 0-27 FEATURES * Low Noise (0.1Hz 1o 10Hz) . 8nV/y Hz .. B2uVIC Slew Rate . MHz Gain Bandwidth ® Low Drift High Speed * Lows Excellent CORR 6dB at Vo of =11V * High Open-Loop Gain . 1.
0-21 TYPICAL PERFORMANCE CHARACTERISTICS 0.1Hz TO 10Hz,,., NOISE TESTER FREQUENCY RESPONSE TEST TWE OF 10 SEC FURTHER HEATS (LOW FREQUENCY (<0112 Gam FREQUENCY ttys) INPUT WIDE BAND VOLTAGE NOISE v8 BANDWIDTH {0.
0-21 TYPICAL PERFORMANCE CHARACTERISTICS OFFSET VOLTAGE DRIFT OF LONG-TERM OFFSET EIGHT REPRESENTATIVE UNITS VOLTAGE DRIFT OF $IX WARM-UP OFFSET vs TEMPERATURE REPRESENTATIVE UNITS VOLTAGE DRIFT hearers roar GPT TIMING Wet H 0 a Tare or Door . : 1550 125 TEMPERATURE (°CH THEM (MONTHS) TIE EATER ROWER ON PAIUTES) OFFSET VOLTAGE CHANGE INPUT BIAS CURRENT INPUT OFFSET CURRENT DUE TO THERMAL SHOCK vs TEMPERATURE vs TEMPERATURE seamy te e vertices || 3.
0-27 TYPICAL PERFORMANCE CHARACTERISTICS VOLTAGE NOISE TEST CIRCUIT ase 2F Scooter NOTE: AL CAPACITOR VALUES ARE FOR NON POPULARIZED AGITATORS ONLY. OPEN-LOOP VOLTAGE GAIN vs LOAD RESISTANCE ‘TEN-LOOP VOLTAGE GAIN = " o 190 LOAD RESISTANCE APPLICATIONS INFORMATION OP-27 Series units may he inserted directly into 725, OP-08, OP-07 and OP-05 sockets with or without removal of external compensation or bulling components.
0 Pp-21 typically changes 4uV due to increasing chip temperature after power-up. n the 10-second measurement interval, these temperature-induced affects can exceed gent-ofnanovolts, {2} For similar reasons, the device has 10 be well-shielded from air currents, Shielding minimizes thermonuclear affects: {3} Sudden motioning the vicinity of the device can also “feed through” to increase the observed noise. {4} The test time to measure noise should ot exceed seconds.
0 Pp-27 PEAK-TO-PEAK NOISE (0.1 to 10Hz NOISE vs 10Hz) vs SOURCE RESISTANCE SOURCE RESISTANCE {INCLUDES RESISTOR NOISE). {INCLUDES RESISTOR NOISE). ® 10 so0 o Stoned Es s harangued Area = Stet Moe Figure 2 g SOURCE RESISTANCE (2} Figure 3 g SOURCE RESISTANCE (3] Therefore, for low-frequency applications, the OP-07 is bet Audio APPLICATIONS ter than the when Rg> 3K(). The only exception is when gain error is important, Figure 3 illustrates the 10Hz noise.
0-27 The OP-27 brings a Hz voltage noise and 0.48 paving HZ current noise to this circuit. To minimize noise from other sources, Ry is set to a value of 1000, which generates a voltage noise of Hz . The noise increases the 3.2nW/ Hz of the amplifier by only 0.70B.
0-21 For applications demanding appreciably dower noise, a high quality microphone-transformer-coupled preamble (Fig. 7) incorporates the internally-compensated OP-27, Ty is a JE-118K-E 1800/15k} transformer which provides an optimum source resistance for the OP-27 device, The circuit has an overall gain of 40dB, the product of the transformer's voltage setup and the op amp’s voltage gain.