AD620BNZ Analog Devices Inc, AD620BNZ Datasheet - Page 16
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AD620BNZ
Manufacturer Part Number
AD620BNZ
Description
IC AMP INST LP LN 18MA 8DIP
Manufacturer
Analog Devices Inc
Type
Instrumentation Ampr
Specifications of AD620BNZ
Design Resources
Low Cost Programmable Gain Instrumentation Amplifier Circuit Using ADG1611 and AD620 (CN0146)
Amplifier Type
Instrumentation
Number Of Circuits
1
Slew Rate
1.2 V/µs
-3db Bandwidth
1MHz
Current - Input Bias
500pA
Voltage - Input Offset
15µV
Current - Supply
900µA
Current - Output / Channel
18mA
Voltage - Supply, Single/dual (±)
4.6 V ~ 36 V, ±2.3 V ~ 18 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Number Of Channels
1
Number Of Elements
1
Power Supply Requirement
Dual
Common Mode Rejection Ratio
80dB
Input Resistance
10000@±15VMohm
Input Offset Voltage
0.05@±15VmV
Input Bias Current
0.001@±15VnA
Single Supply Voltage (typ)
Not RequiredV
Dual Supply Voltage (typ)
15V
Power Dissipation
650mW
Rail/rail I/o Type
No
Single Supply Voltage (min)
Not RequiredV
Single Supply Voltage (max)
Not RequiredV
Dual Supply Voltage (min)
±2.3V
Dual Supply Voltage (max)
±18V
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Through Hole
Pin Count
8
Package Type
PDIP
Bandwidth
12 kHz
Current, Input Bias
0.5 nA
Current, Input Offset
0.3 nA
Current, Supply
1.3 mA
Impedance, Thermal
95 °C/W
Temperature, Operating, Range
-40 to +85 °C
Voltage, Gain
1-10000 V/V
Voltage, Input
-13.1 to +13.8 V
Voltage, Input Offset
15 μV
Voltage, Noise
9 nV/sqrt Hz (Input), 72 nV/sqrt Hz (Output)
Voltage, Output Swing
-13.9 to +13.8 V
Voltage, Supply
±2.3 to ±18 V
No. Of Amplifiers
1
Gain Db Min
1dB
Amplifier Output
Single Ended
Cmrr
130dB
Supply Voltage Range
± 2.3V To ± 18V
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Output Type
-
Gain Bandwidth Product
-
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD620BNZ
Manufacturer:
ADI/亚德诺
Quantity:
20 000
AD620
Precision V-I Converter
The AD620, along with another op amp and two resistors,
makes a precision current source (Figure 42). The op amp
buffers the reference terminal to maintain good CMR. The
output voltage, V
converts it to a current. This current, less only the input bias
current of the op amp, then flows out to the load.
GAIN SELECTION
The AD620’s gain is resistor-programmed by R
precisely, by whatever impedance appears between Pins 1 and 8.
The AD620 is designed to offer accurate gains using 0.1% to 1%
resistors. Table 4 shows required values of R
Note that for G = 1, the R
any arbitrary gain, R
To minimize gain error, avoid high parasitic resistance in series
with R
than 10 ppm/°C—for the best performance.
Table 4. Required Values of Gain Resistors
1% Std Table
Value of R
49.9 k
12.4 k
5.49 k
2.61 k
1.00 k
499
249
100
49.9
Figure 42. Precision Voltage-to-Current Converter (Operates on 1.8 mA, ±3 V)
V
V
IN+
IN–
R
G
G
; to minimize gain drift, R
=
R
G
49
G
(Ω)
G
4 .
−
k
1
I =
Ω
L
X
, of the AD620 appears across R1, which
3
8
1
2
V
Calculated
Gain
1.990
4.984
9.998
19.93
50.40
100.0
199.4
495.0
991.0
R1
x
G
=
can be calculated by using the formula:
AD620
[(V
+V
–V
IN+
G
7
4
S
S
pins are unconnected (R
) – (V
R1
5
IN–
)] G
G
0.1% Std Table
Value of R
49.3 k
12.4 k
5.49 k
2.61 k
1.01 k
499
249
98.8
49.3
should have a low TC—less
6
AD705
G
+ V –
G
(Ω )
R1
for various gains.
X
G
, or more
G
LOAD
Calculated
Gain
2.002
4.984
9.998
19.93
49.91
100.0
199.4
501.0
1,003.0
= ∞). For
I
L
Rev. G | Page 16 of 20
INPUT AND OUTPUT OFFSET VOLTAGE
The low errors of the AD620 are attributed to two sources,
input and output errors. The output error is divided by G when
referred to the input. In practice, the input errors dominate at
high gains, and the output errors dominate at low gains. The
total V
REFERENCE TERMINAL
The reference terminal potential defines the zero output voltage
and is especially useful when the load does not share a precise
ground with the rest of the system. It provides a direct means of
injecting a precise offset to the output, with an allowable range
of 2 V within the supply voltages. Parasitic resistance should be
kept to a minimum for optimum CMR.
INPUT PROTECTION
The AD620 features 400 Ω of series thin film resistance at its
inputs and will safely withstand input overloads of up to ±15 V
or ±60 mA for several hours. This is true for all gains and power
on and off, which is particularly important since the signal
source and amplifier may be powered separately. For longer
time periods, the current should not exceed 6 mA
(I
clamping the inputs to the supplies (using a low leakage diode
such as an FD333) will reduce the required resistance, yielding
lower noise.
RF INTERFERENCE
All instrumentation amplifiers rectify small out of band signals.
The disturbance may appear as a small dc voltage offset. High
frequency signals can be filtered with a low pass R-C network
placed at the input of the instrumentation amplifier. Figure 43
demonstrates such a configuration. The filter limits the input
signal according to the following relationship:
where C
C
signal. Any mismatch in R × C
CMRR. To avoid inadvertently reducing CMRR-bandwidth
performance, make sure that C
smaller than C
larger C
D
IN
affects the difference signal. C
≤ V
Total Error RTI = input error + (output error/G)
Total Error RTO = (input error × G) + output error
FilterFreq
FilterFreq
OS
IN
D
D
for a given gain is calculated as
/400 Ω). For input overloads beyond the supplies,
:C
≥10C
C
ratio.
D
CM
DIFF
C.
. The effect of mismatched C
=
=
2
2
π
π
RC
1
R
2 (
C
C
1
D
C
C
+
will degrade the AD620’s
is at least one magnitude
C
C
affects the common-mode
C
)
C
s is reduced with a