AD845KNZ

Manufacturer Part NumberAD845KNZ
DescriptionIC OPAMP JFET 16MHZ PREC 8DIP
ManufacturerAnalog Devices Inc
AD845KNZ datasheets
 

Specifications of AD845KNZ

Slew Rate100 V/µsAmplifier TypeJ-FET
Number Of Circuits1Gain Bandwidth Product16MHz
Current - Input Bias500pAVoltage - Input Offset100µV
Current - Supply10mACurrent - Output / Channel50mA
Voltage - Supply, Single/dual (±)±4.75 V ~ 18 VOperating Temperature0°C ~ 70°C
Mounting TypeThrough HolePackage / Case8-DIP (0.300", 7.62mm)
Op Amp TypePrecisionNo. Of Amplifiers1
Bandwidth16MHzSupply Voltage Range± 4.75V To ± 18V
Amplifier Case StyleDIPNo. Of Pins8
Common Mode Rejection Ratio113Current, Input Bias0.1 nA
Current, Input Offset15 pACurrent, Output50 mA
Impedance, Thermal100 °C/WPackage TypePDIP-8
Power Dissipation1.6 WResistance, Input10^11 Kilohms
Temperature, Operating, Range0 to +70 °CVoltage, Input±20 V (Differential), +10.5/-13 V (Common-Mode)
Voltage, Noise80 nV/sqrt HzVoltage, Offset0.1 mV
Voltage, Output, High+12.5 VVoltage, Output, Low-12.5 V
Voltage, Supply±15 VLead Free Status / RoHS StatusLead free / RoHS Compliant
Output Type--3db Bandwidth-
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AD845
Figure 5. Settling Time of the 3-Op Amp Instrumentation
Amplifier. Horizontal Scale is 200 ns/Div, Vertical Scale,
Positive Pulse Input is 5 V/Div and Output Settling is
1 mV/Div.
DRIVING THE ANALOG INPUT OF AN A/D CONVERTER
An op amp driving the analog input of an A/D converter, such
as that shown in Figure 7, must be capable of maintaining a
constant output voltage under dynamically changing load condi-
tions. In successive approximation converters, the input current
is compared to a series of switched trial currents. The compari-
son point is diode clamped but may deviate several hundred
millivolts, resulting in high frequency modulation of A/D input
current. The output impedance of a feedback amplifier is made
artificially low by the loop gain. At high frequencies, where the
loop gain is low, the amplifier output impedance can approach
its open-loop value. Most IC amplifiers exhibit a minimum
open-loop output impedance of 25 W due to current limiting
resistors. A few hundred microamps reflected from the change
in converter loading can introduce errors in instantaneous input
voltage. If the A/D conversion speed is not excessive and the
bandwidth of the amplifier is sufficient, the amplifier’s output
will return to the nominal value before the converter makes its
comparison. However, many amplifiers have relatively narrow
bandwidth, yielding slow recovery from output transients. The
Figure 6. Settling Time of the Three Op Amp Instru-
mentation Amplifier. Horizontal Scale: 200 ns/Div; Vertical
Scale, Negative Pulse Input: 5 V/ Div; Output Settling:
1 mV/Div.
AD845 is ideally suited to drive high resolution A/D converters
with 5 ms or longer conversion times since it offers both wide
bandwidth and high open-loop gain.
Figure 7. AD845 As ADC Unity Gain Buffer
–8–
REV. E