Datasheet LT1792 (Analog Devices) - 7

LT1792
W U TYPICAL PERFOR A CE CH C ARA TERISTICS THD and Noise vs Output THD and Noise vs Output Amplitude for Noninverting Gain Amplitude for Inverting Gain
1 1 ZL = 2k  15pF, fO = 1kHz ZL = 2k  15pF, fO = 1kHz AV = 1, 10, 100 AV = –1, –10, –100 MEASUREMENT BANDWIDTH MEASUREMENT BANDWIDTH 0.1 = 10Hz TO 22kHz 0.1 = 10Hz TO 22kHz AV = 100 AV = –100 0.01 0.01 AV = –10 AV = 10 0.001 AV = 1 0.001 AV = –1 TOTAL HARMONIC DISTORTION + NOISE (%) 0.0001 TOTAL HARMONIC DISTORTION + NOISE (%) 0.0001 0.3 1 10 30 0.3 1 10 30 OUTPUT SWING (VP-P) OUTPUT SWING (VP-P) 1792 G18 1792 G19
Short-Circuit Output Current vs Temperature Supply Current vs Temperature
40 5 VS = ±15V 35 30 SINK SOURCE VS = ±15V 25 4 VS = ±5V 20 OUTPUT CURRENT (mA) SUPPLY CURRENT (mA) 15 10 3 – 75 – 50 – 25 0 25 50 75 100 125 – 75 – 50 – 25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) 1792 G20 1792 G21
O U U W U APPLICATI S I FOR ATIO
15V 15V The LT1792 may be inserted directly into OPA124, AD743, AD745, AD645, AD544 and AD820 sockets with improved 2 – 7 2 – 7 noise performance. Offset nulling will be compatible with 6 6 these devices with the wiper of the potentiometer tied to 3 + 4 3 + 4 the negative supply (Figure 1a). No appreciable change in 5 5 ∆V ∆V 1 OS = ±10mV 1 OS = ±1mV offset voltage drift with temperature will occur when the 50k 10k 10k device is nulled with a potentiometer ranging from 10k to 200k. Finer adjustments can be made with resistors in – 15V 1792 F01a 50k series with the potentiometer (Figure 1b). – 15V 1792 F01b Being a low voltage noise JFET op amp, the LT1792 can
(a) (b)
replace many bipolar op amps that are used in amplifying
Figure 1
low level signals from high impedance transducers. The 7