ANALOG DEVICES Very Low Noise Quad Operational Amplifier 0-470 FEATURES _— * Very Low Hz @ kHz Max *» Efficient Input Offset Voltage 0.4mV Max * Low Offset Voltage Drift . . 2uV/°C Max * Very High Gain . Min * Outstanding CMR . 110dE Min * View Rate . . . 2V/us Typ * Gain-Bandwidth Product .
op-470 scions applications. The OP-470 is unity-gain stable with a gain-bandwidth product of MHz and a slew rate of 2V/us. The OP-470 offers excellent amplifier matching which is important for applications such as multiple gain blocks, low noise instrumentation amplifiers, quad buffers, and low-noise active filters. The OP-470 conforms to the industry standard 14-pin DIF pin out.
0-470 TYPICAL PERFORMANCE CHARACTERISTICS w06 CURRENT NOISE oA/ HE INPUT Bi As CURRENT (nA} VOLTAGE NOISE DENSITY vs FREQUENCY AR Yo b8V 1 corn Er = 5 w 106 T FREQUENCY (2} CURRENT NOISE DENSITY vs FREQUENCY CORNER = 2603 FREQUENCY (3] INPUT BIAS CURRENT vs TEMPERATURE 20 g rtv Yom TEMPERATURE ("0} VOLTAGE NOISE DENSITY vs SUPPLY VOLTAGE T-is a7 sore Surly OUTAGE (0t TS) INPUT OFFSET VOLTAGE vs TEMPERATURE TEMPERATURE (-C) s we w5 INPUT OFFSET CURRENT vs TEMPERATURE 3 Yo tsy Yor = 0V HUT OFFSET CURRENT TEMP
0-470 TYPICAL PERFORMANCE CHARACTERISTICS omn CMR vs FREQUENCY Tye2e00 Y= 118 s w0 ko FREQUENCY trey oM PSR vs FREQUENCY T s row 1008 FREQUENCY (hz) GAIN, PHASE SHIFT vs FREQUENCY s Tease 2 Volvo 260 250 5 6749w FREQUENCY (oK) PHASE SHIFT (DEG) TOTAL SUPPLY CURRENT vs SUPPLY VOLTAGE 25T — s w25 TOTAL SUPPLY CURRENT {ma} SUBTLY VOLTAGE (COLTS) PEN-LOOP GAIN vs FREQUENCY 15V =T VOLTAGE GAIN FREQUENCY (Hz) OPEN-LOOP GAIN vs SUPPLY VOLTAGE 5000 Te= e Ay ago SUPPLY VOLTAGE (VOLTS) PHASE MARTIN (DEG) s TOTAL SUPP
0-470 CHANNEL SEPARATION TEST CIRCUIT su sue 5 opera s012 14 arum b O Y BURN-IN CIRCUIT APPLICATIONS INFORMATION VOLTAGE AND CURRENT NOISE The OP-470 is & very low-noise quad op amp. exhibiting & typical voltage noise of only @ KHz. The exceptionally low noise characteristics of the OP-470 is in part achieved by operating the input transistors at high collector currents since the voltage noise is inversely proportional to the square root of the collector current.
0-470 1k$), total noise increases and is dominated by resistor noise rather than by voltage or current noise of the OR-470. When Rg exceeds 20k, current noise of the OP-470 becomes the major contributor to total noise Figure 2 also shows the relationship between total noise and source resistance, but at 10Hz. Total noise increases more quickly than shown in Figure 1 because current noise is inversely proportional to the square root of frequency.
0-470 noise specification of the OP-gigging the 0.1Hz to 10Hz range, the following precautions must be observed: 1. The device has to be warmed-up for at least five minutes, As shown in the warm-up drift curve, the offset voltage typically changes 8uV due to increasing chip temperature after prows-up. In the 10-second measurement interval, these temperature-induced effects can exceed tense-nanovolts. 2.
0-470 FIGURE 7: Current Noise Density Test Circuit a2 12668 R B2 st 00Kt & 6 BHUTTO l Sheratan ANALYZER sae Re 20001 GAIN = 1000 SBA “ NOISE MEASUREMENT — CURRENT NOISE DENSITY The test circuit shown in Figure 7 can be used to measure current noise density.
0-470 applications use dual tracking supplies and with the device supply pins properly bypassed, power-up wiki not present a problem. A source resistance of at least 10002 in series with alf inputs {Figure 8) will limit the parasitic currents to a safe level it Vis disconnected. It should be noted that any source resistance, gen 1000}, adds noise to the circuit.
0-470 FIGURE 12: Digital Panning Control Circuit 1 narc-saocco Yoo 2, Vessel v ] Side Yrgr© abeam 2 e DAT DATA 8US PING 3QL5B)— 18ihiSB) e5y GUT 0 Our b3 B OUT 0 8 00T FIGURE 13: Digital Panning Contort Output FIGURE 14: Squelch Amplifier sour Our SQUELCH AMPLIFIER The circuit of Figure 1413 a simple squelch amplifier that uses a FET switch to cut off the output when the input signal fails below a preset limit. The input signal is sampled by a peak detector with a time constant set by C1 and R6.
0-470 FIVE-BAND LOW NOISE STEREO GRAPHIC EQUALIZER ratio over a kHz bandwidth is better than 100dB referred to The graphic equalizer circuit shown in Figure 16 provides & 3V rms input. Larger inductance can be replaced by active 16dB of boost or cut over a S-band range. Signal-to noise conductors but this reduces the signal-to-noise ratio.
