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AD8224 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8224
Beschreibung JFET Input Rail-to-Rail Instrumentation Amplifier
Hersteller Analog Devices
Logo Analog Devices Logo 



Gesamt 29 Seiten
		
AD8224 Datasheet, Funktion
Data Sheet
Precision, Dual-Channel, JFET Input,
Rail-to-Rail Instrumentation Amplifier
AD8224
FEATURES
Two channels in a small 4 mm × 4 mm LFCSP
Custom LFCSP package with hidden paddle
Permits routing and vias underneath package
Allows full bias current performance
Low input currents
10 pA maximum input bias current (B grade)
0.6 pA maximum input offset current (B grade)
High CMRR
100 dB CMRR (minimum), G = 10 (B grade)
90 dB CMRR (minimum) to 10 kHz, G = 10 (B grade)
Excellent ac specifications and low power
1.5 MHz bandwidth (G = 1)
14 nV/√Hz input noise (1 kHz)
Slew rate: 2 V/µs
750 µA quiescent current per amplifier
Versatility
Rail-to-rail output
Input voltage range to below negative supply rail
4 kV ESD protection
4.5 V to 36 V single supply
±2.25 V to ±18 V dual supply
Gain set with single resistor (G = 1 to 1000)
APPLICATIONS
Medical instrumentation
Precision data acquisition
Transducer interfaces
Differential drives for high resolution input ADCs
Remote sensors
GENERAL DESCRIPTION
The AD8224 is the first single-supply, JFET input instrumentation
amplifier available in the space-saving 16-lead, 4 mm × 4 mm
LFCSP. It requires the same board area as a typical single
instrumentation amplifier yet doubles the channel density
and offers a lower cost per channel without compromising
performance.
Designed to meet the needs of high performance, portable
instrumentation, the AD8224 has a minimum common-mode
rejection ratio (CMRR) of 86 dB at dc and a minimum CMRR
of 80 dB at 10 kHz for G = 1. Maximum input bias current is 10 pA
and typically remains below 300 pA over the entire industrial
temperature range. Despite the JFET inputs, the AD8224
typically has a noise corner of only 10 Hz.
With the proliferation of mixed-signal processing, the number
of power supplies required in each system has grown. Designed
Rev. D
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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FUNCTIONAL BLOCK DIAGRAM
16 15 14 13
AD8224
–IN1 1
RG1 2
RG1 3
+IN1 4
12 –IN2
11 RG2
10 RG2
9 +IN2
5 678
Figure 1.
Table 1. In Amps and Difference Amplifiers by Category
High
Low
Perform Cost
High Mil Low Digital
Voltage Grade Power Gain
AD82201 AD85531 AD628
AD8221 AD6231 AD629
AD620 AD6271 AD82311
AD621
AD8250
AD8222
AD524
AD526
AD8251
AD85551
AD624
AD85561
AD85571
1 Rail-to-rail output.
to alleviate this problem, the AD8224 can operate on a ±18 V
dual supply, as well as on a single +5 V supply. The device’s rail-
to-rail output stage maximizes dynamic range on the low voltage
supplies common in portable applications. Its ability to run on a
single 5 V supply eliminates the need for higher voltage, dual
supplies. The AD8224 draws 750 µA of quiescent current per
amplifier, making it ideal for battery powered devices.
In addition, the AD8224 can be configured as a single-channel,
differential output, instrumentation amplifier. Differential
outputs provide high noise immunity, which can be useful when
the output signal must travel through a noisy environment, such
as with remote sensors. The configuration can also be used to
drive differential input ADCs. For a single-channel version, use
the AD8220.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2007–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com






AD8224 Datasheet, Funktion
Data Sheet
AD8224
VS+ = +15 V, VS− = −15 V, VREF = 0 V, TA = 25°C, G = 1, RL = 2 kΩ1, unless otherwise noted. Table 3 displays the specifications for the
dynamic performance of each individual instrumentation amplifier.
Table 3. Dynamic Performance of Each Individual Amplifier—Single-Ended Output Configuration, VS = ±15 V
Test Conditions/
A Grade
B Grade
Parameter
Comments
Min Typ
Max Min Typ Max Unit
DYNAMIC RESPONSE
Small Signal Bandwidth −3 dB
G=1
1500
1500
kHz
G = 10
800 800 kHz
G = 100
120 120 kHz
G =1000
14 14 kHz
Settling Time 0.01%
G=1
ΔVO = ±10 V step
5
5 µs
G = 10
4.3 4.3 µs
G = 100
8.1 8.1 µs
G =1000
58 58 µs
Settling Time 0.001%
G=1
ΔVO = ±10 V step
6
6 µs
G = 10
4.6 4.6 µs
G = 100
9.6 9.6 µs
G =1000
74 74 µs
Slew Rate
G = 1 to 100
2 2 V/µs
1 When the output sinks more than 4 mA, use a 47 pF capacitor in parallel with the load to prevent ringing. Otherwise, use a larger load, such as 10 kΩ.
VS+ = +15 V, VS− = −15 V, VREF = 0 V, TA = 25°C, G = 1, RL = 2 kΩ1, unless otherwise noted. Table 4 displays the specifications for the
dynamic performance of both amplifiers when used in the differential output configuration shown in Figure 64.
Table 4. Dynamic Performance of Both Amplifiers—Differential Output Configuration2, VS = ±15 V
Test Conditions/
A Grade
B Grade
Parameter
Comments
Min Typ
Max Min Typ Max
DYNAMIC RESPONSE
Small Signal Bandwidth −3 dB
G=1
1500
1500
G = 10
800 800
G = 100
120 120
G =1000
14 14
Settling Time 0.01%
G=1
ΔVO = ±10 V step
5
5
G = 10
4.3 4.3
G = 100
8.1 8.1
G =1000
58 58
Settling Time 0.001%
G=1
ΔVO = ±10 V step
6
6
G = 10
4.6 4.6
G = 100
9.6 9.6
G =1000
74 74
Slew Rate
G = 1 to 100
22
1 When the output sinks more than 4 mA, use a 47 pF capacitor in parallel with the load to prevent ringing. Otherwise, use a larger load, such as 10 kΩ.
2 Refers to the differential configuration shown in Figure 64.
Unit
kHz
kHz
kHz
kHz
µs
µs
µs
µs
µs
µs
µs
µs
V/µs
Rev. D | Page 5 of 28

6 Page







AD8224 pdf, datenblatt
Data Sheet
AD8224
–IN1 1
RG1 2
RG1 3
+IN1 4
AD8224
TOP VIEW
(Not to Scale)
12 –IN2
11 RG2
10 RG2
9 +IN2
NOTES
1. THE EXPOSED THERMAL PAD IS CONNECTED INTERNALLY
TO +VS. THE PAD CAN EITHER BE LEFT UNCONNECTED OR
CONNECTED TO THE POSITIVE SUPPLY RAIL.
Figure 4. 16-Lead LFCSP Pin Configuration with Exposed Pad
Table 12. Pin Function Descriptions
Pin Number Mnemonic Description
1
−IN1
Negative Input In-Amp 1.
2 RG1 Gain Resistor In-Amp 1.
3 RG1 Gain Resistor In-Amp 1.
4
+IN1
Positive Input In-Amp 1.
5 +VS Positive Supply.
6
REF1
Reference Adjust In-Amp 1.
7
REF2
Reference Adjust In-Amp 2.
8 −VS Negative Supply.
9
+IN2
Positive Input In-Amp 2.
10 RG2 Gain Resistor In-Amp 2.
11 RG2 Gain Resistor In-Amp 2.
12
−IN2
Negative Input In-Amp 2.
13 −VS Negative Supply.
14
OUT2
Output In-Amp 2.
15
OUT1
Output In-Amp 1.
16 +VS Positive Supply.
EPAD
Exposed Pad. The exposed thermal pad is connected internally to +VS. The pad can either be left unconnected
or connected to the positive supply rail.
Rev. D | Page 11 of 28

12 Page


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