AD704KN

AD704 AD | Alldatasheet

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REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD704 Tel: 617/329-4700 Fax: 617/326-8703

FEATURES

1 mV/8C max Offset Voltage Drift 150 pA max Input Bias Current 0.2 pA/ 8C typical I B Drift Low Noise 0.5 mV p-p typical Noise, 0.1 Hz to 10 Hz Low Power 600 mA max Supply Current per Amplifier Chips & MIL-STD-883B Processing Available Available in Tape and Reel in Accordance with EIA-481A Standard Single Version: AD705, Dual Version: AD706 PRIMARY APPLICATIONS Industrial/Process Controls Weigh Scales ECG/EKG Instrumentation Low Frequency Active Filters PRODUCT DESCRIPTION The AD704 is a quad, low power bipolar op amp that has the low input bias current of a BiFET amplifier but which offers a significantly lower IB drift over temperature. It utilizes Super- beta bipolar input transistors to achieve picoampere input bias current levels (similar to FET input amplifiers at room tempera- ture), while its I B typically only increases by 5 × at +125°C (unlike a BiFET amp, for which I B doubles every 10°C resulting in a 1000× increase at +125°C). Furthermore the AD704 achieves 75 µV offset voltage and low noise characteristics of a precision bipolar input op amp. 100 0.1 0.01 –55 +25 +125 TEMPERATURE – °C TYPICAL I – nAB TYPICAL JFET AMP AD704T Figure 1. Input Bias Current Over Temperature density circuit boards and battery powered applications. processed to MIL-STD-883B, Rev. C.

REV. A–2– AD704–SPECIFICATIONS(@ TA = +258C, VCM = 0 V, and 615 V dc, unless otherwise noted) Model AD704J/A AD704K/B AD704T Conditions Min Typ Max Min Typ Max Min Typ Max Units INPUT OFFSET VOLTAGE Initial Offset 50 150 30 75 30 100 µV Offset T MIN–TMAX 100 250 50 150 80 150 µV vs. Supply (PSRR) V S = ± 2 to ± 18 V 100 132 112 132 112 132 dB TMIN–TMAX VS = ± 2.5 to ± 18 V 100 126 108 126 108 126 dB Long Term Stability 0.3 0.3 0.3 µV/month INPUT BIAS CURRENT 1 VCM = 0 V 100 270 80 150 80 200 pA VCM = ± 13.5 V 300 200 250 pA vs. Temp, Average TC 0.3 0.2 1.0 pA/ °C TMIN–TMAX VCM = 0 V 300 200 600 pA TMIN–TMAX VCM = ± 13.5 V 400 300 700 pA INPUT OFFSET CURRENT V CM = 0 V 80 250 30 100 50 150 pA VCM = ± 13.5 V 300 150 200 pA vs. Temp, Average TC 0.6 0.4 0.4 pA/ °C TMIN–TMAX VCM = 0 V 100 300 80 200 80 400 pA TMIN–TMAX VCM = ± 13.5 V 100 400 80 300 100 500 pA MATCHING CHARACTERISTICS Offset Voltage 250 130 150 µV TMIN–TMAX 400 200 250 µV Input Bias Current 2 500 300 400 pA TMIN–TMAX 600 400 600 pA Common-Mode Rejection 3 94 110 104 dB TMIN–TMAX 94 104 104 dB Power Supply Rejection 4 94 110 110 dB TMIN–TMAX 94 106 106 dB Crosstalk5 f = 10 Hz RLOAD = 2 kΩ 150 150 150 dB FREQUENCY RESPONSE UNITY GAIN Crossover Frequency 0.8 0.8 0.8 MHz Slew Rate, Unity Gain G = –1 0.15 0.15 0.15 V/ µs Slew Rate T MIN–TMAX 0.1 0.1 0.1 V/ µs INPUT IMPEDANCE Differential 40 i24 0 i24 0 i2M Ω ipF Common-Mode 300 i2 300 i2 300 i2G Ω ipF INPUT VOLTAGE RANGE Common-Mode Voltage ± 13.5 ± 14 ± 13.5 ± 14 ± 13.5 ± 14 V Common-Mode Rejection Ratio V CM = ± 13.5 V 100 132 114 132 110 132 dB TMIN–TMAX 98 128 108 128 108 128 dB INPUT CURRENT NOISE 0.1 to 10 Hz 3 3 3 pA p-p f = 10 Hz 50 50 50 fA/ √Hz f = 10 Hz 17 17 17 nV/ √Hz f = 1 kHz 15 22 15 22 15 22 nV/ √Hz OPEN-LOOP GAIN V O = ± 12 V RLOAD = 10 kΩ 200 2000 400 2000 400 2000 V/mV TMIN–TMAX 150 1500 300 1500 300 1500 V/mV VO = ± 10 V RLOAD = 2 kΩ 200 1000 300 1000 200 1000 V/mV TMIN–TMAX 150 1000 200 1000 100 1000 V/mV

Figure 24. Gain of 10 Instrumentation Amplifier with Post Filtering temperature with a minimum of components.

0.9 G − 1

Figure 25. Common-Mode Rejection vs. Frequency with

3 PLCS

Dimensions shown in inches and (mm). values for several common low pass responses. Figure 26. V OS vs. Temperature Performance of the 1 Hz