AD845KNZ Analog Devices Inc, AD845KNZ Datasheet - Page 7

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AD845KNZ

Manufacturer Part Number
AD845KNZ
Description
IC OPAMP JFET 16MHZ PREC 8DIP
Manufacturer
Analog Devices Inc
Datasheets

Specifications of AD845KNZ

Slew Rate
100 V/µs
Amplifier Type
J-FET
Number Of Circuits
1
Gain Bandwidth Product
16MHz
Current - Input Bias
500pA
Voltage - Input Offset
100µV
Current - Supply
10mA
Current - Output / Channel
50mA
Voltage - Supply, Single/dual (±)
±4.75 V ~ 18 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Op Amp Type
Precision
No. Of Amplifiers
1
Bandwidth
16MHz
Supply Voltage Range
± 4.75V To ± 18V
Amplifier Case Style
DIP
No. Of Pins
8
Common Mode Rejection Ratio
113
Current, Input Bias
0.1 nA
Current, Input Offset
15 pA
Current, Output
50 mA
Impedance, Thermal
100 °C/W
Package Type
PDIP-8
Power Dissipation
1.6 W
Resistance, Input
10^11 Kilohms
Temperature, Operating, Range
0 to +70 °C
Voltage, Input
±20 V (Differential), +10.5/-13 V (Common-Mode)
Voltage, Noise
80 nV/sqrt Hz
Voltage, Offset
0.1 mV
Voltage, Output, High
+12.5 V
Voltage, Output, Low
-12.5 V
Voltage, Supply
±15 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Output Type
-
-3db Bandwidth
-
Lead Free Status / Rohs Status
RoHS Compliant part Electrostatic Device

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REV. E
MEASURING AD845 SETTLING TIME
Figure 1 shows AD845 settling time performance. This measure-
ment was accomplished by driving the amplifier in the unity
gain inverting mode with a fast pulse generator. The input
summing junction was measured using false nulling techniques.
Settling time is defined as the interval of time from the application
of an ideal step function input until the closed-loop amplifier
output has entered and remains within a specified error band.
Components of settling time include:
These individual components can be seen easily in Figure 1.
Settling time is extremely important in high speed applications
where the current output of a DAC must be converted to a
voltage. When driving a 500 W load in parallel with a 100 pF
capacitor, the AD845 settles to 0.1% in 250 ns and to 0.01% in
310 ns.
A HIGH SPEED INSTRUMENTATION AMP
The 3-op amp instrumentation amplifier circuit shown in
Figure 3 can provide a range of gains from unity up to 1000 and
higher. The instrumentation amplifier configuration features
high common-mode rejection, balanced differential inputs, and
1. Propagation time through the amplifier
2. Slewing time to approach the final output value
3. Recovery time from overload associated with the slewing
4. Linear settling to within a specified error band
Figure 1. Settling Characteristics 0 V to 10 V Step
Upper Trace: Output of AD845 Under Test (5 V/Div)
Lower Trace: Error Voltage (1 mV/Div)
Figure 2. Settling Time Test Circuit
–7–
stable, accurately defined gain. Low input bias currents and fast
settling are achieved with the FET input AD845.
Most monolithic instrumentation amplifiers do not have the
high frequency performance of the circuit in Figure 3. The cir-
cuit bandwidth is 10.9 MHz at a gain of 1 and 8.8 MHz at a
gain of 10; settling time for the entire circuit is 900 ns to 0.01%
for a 10 V step (Gain = 10).
The capacitors employed in this circuit greatly improve the
amplifier’s settling time and phase margin.
Figure 3. High Performance, High Speed Instrumentation
Amplifier
Gain
1
2
10
100
Note: Resistors around the amplifiers’ input pins need to be small enough in
value so that the RC time constant they form, with stray circuit capacitance,
does not reduce circuit bandwidth.
Figure 4. The Pulse Response of the 3-Op Amp
Instrumentation Amplifier. Gain = 1, Horizontal Scale =
0.5 ms/Div and Vertical Scale = 5 V/Div.
Table I. Performance Summary for the 3-Op Amp
Instrumentation Amplifier Circuit
R
Open
2 kW
226 W
20 W
G
3-Op Amp In-Amp
Small Signal
Bandwidth
10.9 MHz
8.8 MHz
2.6 MHz
290 kHz
Settling Time
to 0.01%
500 ns
500 ns
900 ns
7.5 ms
AD845

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