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PDF AD8224 Data sheet ( Hoja de datos )
| Número de pieza | AD8224 | |
| Descripción | JFET Input Rail-to-Rail Instrumentation Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
1 page  
AD8224
Data Sheet
Test Conditions/
A Grade
B Grade
Parameter
Comments
Min
Typ Max
Min
Typ Max
Unit
GAIN
Gain Range
G = 1 + (49.4 kΩ/RG)
1
1000
1
1000
V/V
Gain Error
G=1
VOUT = ±10 V
0.06 0.04 %
G = 10
0.3 0.2 %
G = 100
0.3 0.2 %
G = 1000
0.3 0.2 %
Gain Nonlinearity
G=1
G = 10
G = 100
G = 1000
G=1
G = 10
G = 100
G=1000
Gain vs. Temperature
VOUT = −10 V to +10 V
RL = 10 kΩ
RL = 10 kΩ
RL = 10 kΩ
RL = 10 kΩ
RL = 2 kΩ
RL = 2 kΩ
RL = 2 kΩ
RL = 2 kΩ
8 15
5 10
15 25
100 150
15 20
12 20
35 50
180 250
8 15
5 10
15 25
100 150
15 20
12 20
35 50
180 250
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
G=1
3 10
25
ppm/°C
G > 10
−50 −50 ppm/°C
INPUT
Impedance (Pin to Ground)4
Input Operating Voltage Range5
Over Temperature
OUTPUT
VS = ±2.25 V to ±18 V
for dual supplies
T = −40°C to +85°C
104||5
−VS − 0.1
−VS − 0.1
+VS − 2
104||5
−VS − 0.1
+VS − 2.1 −VS − 0.1
+VS − 2
GΩ||pF
V
+VS − 2.1 V
Output Swing
Over Temperature
RL = 2 kΩ
T = −40°C to +85°C
−14.25
−14.3
+14.25
+14.1
−14.25
−14.3
+14.25
+14.1
V
V
Output Swing
Over Temperature
RL = 10 kΩ
T = −40°C to +85°C
−14.7
−14.6
+14.7
+14.6
−14.7
−14.6
+14.7
+14.6
V
V
Short-Circuit Current
15 15 mA
POWER SUPPLY
Operating Range
±2.256
±18 ±2.256
±18 V
Quiescent Current (Per Amplifier)
750 800
750 800
µA
Over Temperature
T = −40°C to +85°C
850 900
850 900
µA
TEMPERATURE RANGE
For Specified Performance
Operational7
−40 +85 −40 +85 °C
−40
+125
−40
+125
°C
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.
3 Refer to Figure 15 and Figure 16 for the relationship between input current and temperature.
4 Differential and common-mode input impedance can be calculated from the pin impedance: ZDIFF = 2(ZPIN); ZCM = ZPIN/2.
5 The AD8224 can operate up to a diode drop below the negative supply; however, the bias current increases sharply. The input voltage range reflects the maximum
allowable voltage where the input bias current is within the specification.
6 At this supply voltage, ensure that the input common-mode voltage is within the input voltage range specification.
7 The AD8224 is characterized from −40°C to +125°C. See the Typical Performance Characteristics section for expected operation in this temperature range.
Rev. D | Page 4 of 28
5 Page 
AD8224
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
–IN1 1
RG1 2
RG1 3
+IN1 4
PIN 1
INDICATOR
AD8224
TOP VIEW
12 –IN2
11 RG2
10 RG2
9 +IN2
Figure 3. 16-Lead LFCSP Pin Configuration with Hidden Paddle
Table 11. Pin Function Descriptions
Pin Number Mnemonic Description
1
−IN1
Negative Input Instrumentation Amplifier (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
Data Sheet
Rev. D | Page 10 of 28
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet AD8224.PDF ] | |
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