Analog Devices AD623 c Datasheet

Single Supply, Rail-to-Rail, Low Cost
8
7
6
5
3 4
2R
G
2IN 1IN
2V
S
1R
G
1V
S
OUTPUT
REF
AD623
1 2
a
FEATURES Easy to Use Higher Performance than Discrete Design Single and Dual Supply Operation Rail-to-Rail Output Swing Input Voltage Range Extends 150 mV Below Ground
(Single Supply) Low Power, 575 mA Max Supply Current Gain Set with One External Resistor
Gain Range 1 (No Resistor) to 1,000
HIGH ACCURACY DC PERFORMANCE
0.1% Gain Accuracy (G = 1)
0.35% Gain Accuracy (G > 1) 25 ppm Gain Drift (G = 1) 200 mV Max Input Offset Voltage (AD623A) 2 mV/8C Max Input Offset Drift (AD623A) 100 mV Max Input Offset Voltage (AD623B) 1 mV/8C Max Input Offset Drift (AD623B) 25 nA Max Input Bias Current
NOISE
35 nV/Hz RTI Noise @ 1 kHz (G = 1)
EXCELLENT AC SPECIFICATIONS 90 dB Min CMRR (G = 10); 84 dB Min CMRR (G = 5)
(@ 60 Hz, 1K Source Imbalance) 800 kHz Bandwidth (G = 1) 20 ms Settling Time to 0.01% (G = 10)
APPLICATIONS Low Power Medical Instrumentation Transducer Interface Thermocouple Amplifier Industrial Process Controls Difference Amplifier Low Power Data Acquisition
PRODUCT DESCRIPTION
The AD623 is an integrated single supply instrumentation am­plifier that delivers rail-to-rail output swing on a single supply (+3 V to +12 V supplies). The AD623 offers superior user flex­ibility by allowing single gain set resistor programming, and conforming to the 8-lead industry standard pinout configura­tion. With no external resistor, the AD623 is configured for unity gain (G = 1) and with an external resistor, the AD623 can be programmed for gains up to 1,000.
The AD623 holds errors to a minimum by providing superior AC CMRR that increases with increasing gain. Line noise, as well as line harmonics, will be rejected since the CMRR re­mains constant up to 200 Hz. The AD623 has a wide input
Instrumentation Amplifier
AD623
CONNECTION DIAGRAM
8-Lead Plastic DIP (N),
SOIC (R) and mSOIC (RM) Packages
common-mode range and can amplify signals that have a common-mode voltage 150 mV below ground. Although the design of the AD623 has been optimized to operate from a single supply, the AD623 still provides superior performance when
operated from a dual voltage supply (± 2.5 V to ±6.0 V).
Low power consumption (1.5 mW at 3 V), wide supply voltage range, and rail-to-rail output swing make the AD623 ideal for battery powered applications. The rail-to-rail output stage maxi­mizes the dynamic range when operating from low supply volt­ages. The AD623 replaces discrete instrumentation amplifier designs and offers superior linearity, temperature stability and reliability in a minimum of space. Until the AD623, this level of instrumentation amplifier performance has not been achieved.
120
110
100
90
80
70
CMR – dB
60
50
40
30
1
10 100 1k 10k
FREQUENCY – Hz
Figure 1. CMR vs. Frequency, +5 VS, 0 V
x1000
x100
x10
x1
100k
S
REV. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
AD623–SPECIFICATIONS
SINGLE SUPPLY
(typical @ +258C Single Supply, VS = +5 V, and RL = 10 kV, unless otherwise noted)
Model AD623A AD623ARM AD623B Specification Conditions Min Typ Max Min Typ Max Min Typ Max Units
GAIN G = 1 + (100 k/RG)
Gain Range 1 1000 1 1000 1 1000 Gain Error
1
G1 V
OUT
=
0.05 V to 3.5 V G > 1 V
OUT
=
0.05 V to 4.5 V G = 1 0.03 0.10 0.03 0.10 0.03 0.05 % G = 10 0.10 0.35 0.10 0.35 0.10 0.35 % G = 100 0.10 0.35 0.10 0.35 0.10 0.35 % G = 1000 0.10 0.35 0.10 0.35 0.10 0.35 %
Nonlinearity, G1 V
OUT
=
0.05 V to 3.5 V
G > 1 V
OUT
=
0.05 V to 4.5 V G = 1–1000 50 50 50 ppm Gain vs. Temperature
G = 1 5 10 5 10 5 10 ppm/°C
1
G > 1
50 50 50 ppm/°C
VOLTAGE OFFSET Total RTI Error =
V
+ V
Input Offset, V
OSI
OSI
OSO
/G
25 200 200 500 25 100 µV Over Temperature 350 650 160 µV Average TC 0.1 2 0.1 2 0.1 1 µV/°C
Output Offset, V
OSO
200 1000 500 2000 200 500 µV Over Temperature 1500 2600 1100 µV Average TC 2.5 10 2.5 10 2.5 10 µV/°C
Offset Referred to the Input
vs. Supply (PSR)
G = 1 80 100 80 100 80 100 dB G = 10 100 120 100 120 100 120 dB G = 100 120 140 120 140 120 140 dB G = 1000 120 140 120 140 120 140 dB
INPUT CURRENT
Input Bias Current 17 25 17 25 17 25 nA
Over Temperature 27.5 27.5 27.5 nA
Average TC 25 25 25 pA/°C
Input Offset Current 0.25 2 0.25 2 0.25 2 nA
Over Temperature 2.5 2.5 2.5 nA
Average TC 5 5 5 pA/°C
INPUT
Input Impedance
Differential 2i22i22i2GipF Common-Mode 2i22i22i2GipF
Input Voltage Range
2
VS = +3 V to +12 V (–VS) – 0.15 (+VS) – 1.5 (–VS) – 0.15 (+VS) – 1.5 (–VS) – 0.15 (+VS) – 1.5 V
Common-Mode Rejection at
60 Hz with 1 k Source
Imbalance
G = 1 VCM = 0 V to 3 V 70 80 70 80 77 86 dB G = 10 VCM = 0 V to 3 V 90 100 90 100 94 100 dB G = 100 VCM = 0 V to 3 V 105 110 105 110 105 110 dB G = 1000 VCM = 0 V to 3 V 105 110 105 110 105 110 dB
OUTPUT
Output Swing R
= 10 k +0.01 (+V
L
R
= 100 k +0.01 (+V
L
) – 0.5 +0.01 (+VS) – 0.5 +0.01 (+VS) – 0.5 V
S
) – 0.15 +0.01 (+VS) – 0.15 +0.01 (+VS) – 0.15 V
S
DYNAMIC RESPONSE
Small Signal –3 dB
Bandwidth
G = 1 800 800 800 kHz G = 10 100 100 100 kHz G = 100 10 10 10 kHz G = 1000 2 2 2 kHz
Slew Rate 0.3 0.3 0.3 V/µs
Settling Time to 0.01% VS = +5 V
G = 1 Step Size: 3.5 V 30 30 30 µ s
G = 10 Step Size: 4 V,
V
= 1.8 V 20 20 20 µs
CM
–2–
REV. C
AD623
DUAL SUPPLIES
(typical @ +258C Dual Supply, VS = 65 V, and RL = 10 kV, unless otherwise noted)
Model AD623A AD623ARM AD623B Specification Conditions Min Typ Max Min Typ Max Min Typ Max Units
GAIN G = 1 + (100 k/RG)
Gain Range 1 1000 1 1000 1 1000 Gain Error
1
G1 V
OUT
= –4.8 V to 3.5 V G > 1 V
OUT
=
0.05 V to 4.5 V
G = 1 0.03 0.10 0.03 0.10 0.03 0.05 % G = 10 0.10 0.35 0.10 0.35 0.10 0.35 % G = 100 0.10 0.35 0.10 0.35 0.10 0.35 % G = 1000 0.10 0.35 0.10 0.35 0.10 0.35 %
Nonlinearity, G1 V
OUT
= –4.8 V to 3.5 V G > 1 V
OUT
=
–4.8 V to 4.5 V
G = 1–1000 50 50 50 ppm Gain vs. Temperature
G = 1 5 10 5 10 5 10 ppm/°C
1
G > 1
50 50 50 ppm/°C
VOLTAGE OFFSET Total RTI Error =
V
+ V
Input Offset, V
OSI
OSI
OSO
/G
25 200 200 500 25 100 µV Over Temperature 350 650 160 µV Average TC 0.1 2 0.1 2 0.1 1 µV/°C
Output Offset, V
OSO
200 1000 500 2000 200 500 µV Over Temperature 1500 2600 1100 µV Average TC 2.5 10 2.5 10 2.5 10 µV/°C
Offset Referred to the Input
vs. Supply (PSR)
G = 1 80 100 80 100 80 100 dB G = 10 100 120 100 120 100 120 dB G = 100 120 140 120 140 120 140 dB G = 1000 120 140 120 140 120 140 dB
INPUT CURRENT
Input Bias Current 17 25 17 25 17 25 nA
Over Temperature 27.5 27.5 27.5 nA
Average TC 25 25 25 pA/°C
Input Offset Current 0.25 2 0.25 2 0.25 2 nA
Over Temperature 2.5 2.5 2.5 nA
Average TC 5 5 5 pA/°C
INPUT
Input Impedance
Differential 2i22i22i2GipF Common-Mode 2i22i22i2GipF
Input Voltage Range
2
V
= +2.5 V to ±6 V (–V
S
) – 0.15 (+VS) – 1.5 (–VS) –0.15 (+VS) – 1.5 (–VS) – 0.15 (+VS) – 1.5 V
S
Common-Mode Rejection at
60 Hz with 1 k Source
Imbalance
G = 1 VCM = +3.5 V to –5.15 V 70 80 70 80 77 86 dB G = 10 VCM = +3.5 V to –5.15 V 90 100 90 100 94 100 dB G = 100 VCM = +3.5 V to –5.15 V 105 110 105 110 105 110 dB G = 1000 VCM = +3.5 V to –5.15 V 105 110 105 110 105 110 dB
OUTPUT
Output Swing R
= 10 k, VS = ±5 V (–V
L
R
= 100 k (–V
L
) +0. 2 (+VS) – 0.5 (–VS) + 0.2 (+VS) – 0.5 (–VS) + 0.2 (+VS) – 0.5 V
S
) + 0.05 (+VS) – 0.15 (–VS) + 0.05 (+VS) – 0.15 (–VS) + 0.05 (+VS) – 0.15 V
S
DYNAMIC RESPONSE
Small Signal –3 dB
Bandwidth
G = 1 800 800 800 kHz G = 10 100 100 100 kHz G = 100 10 10 10 kHz G = 1000 2 2 2 kHz
Slew Rate 0.3 0.3 0.3 V/µs
Settling Time to 0.01% V
= ±5 V, 5 V Step
S
G = 1 30 30 30 µ s G = 10 20 20 20 µ s
–3–REV. C
AD623–SPECIFICATIONS
WARNING!
ESD SENSITIVE DEVICE
BOTH DUAL AND SINGLE SUPPLIES
Model AD623A AD623ARM AD623B Specification Conditions Min Typ Max Min Typ Max Min Typ Max Units
NOISE
Voltage Noise, 1 kHz Total RTI Noise =
Input, Voltage Noise, e Output, Voltage Noise, e
RTI, 0.1 Hz to 10 Hz
G = 1 3.0 3.0 3.0 µV p-p G = 1000 1.5 1.5 1.5 µV p-p
Current Noise f = 1 kHz 100 100 100 fA/Hz
0.1 Hz to 10 Hz 1.5 1.5 1.5 pA p-p
REFERENCE INPUT
R
IN
I
IN
Voltage Range –V
Gain to Output 1 ± 0.0002 1 ± 0.0002 1 ± 0.0002 V
POWER SUPPLY
Operating Range Dual Supply ±2.5 ±6 ±2.5 ±6 ±2.5 ±6V
Quiescent Current Dual Supply 375 550 375 550 375 550 µA
Over Temperature 625 625 625 µA
TEMPERATURE RANGE
For Specified Performance –40 to +85 –40 to +85 –40 to +85 °C
NOTES
1
Does not include effects of external resistor RG.
2
One input grounded. G = 1.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±6 V
Internal Power Dissipation
ni
no
V
, V
= 0 +50 +60 +50 +60 +50 +60 µA
IN+
REF
Single Supply +2.7 +12 +2.7 +12 +2.7 +12 V
Single Supply 305 480 305 480 305 480 µA
1
2
. . . . . . . . . . . . . . . . . . . . 650 mW

e
ni
2
+ e
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . ±6 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range
(N, R, RM) . . . . . . . . . . . . . . . . . . . . . . . –65°C to +125°C
Operating Temperature Range
(A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
2
/G
no
ORDERING GUIDE
35 35 35 nV/Hz 50 50 50 nV/Hz
100 ±20% 100 ±20% 100 ±20% k
S
+VS–V
S
+VS–V
S
+V
S
Lead Temperature Range
(Soldering 10 seconds) . . . . . . . . . . . . . . . . . . . . . . +300°C
NOTES
1
Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2
Specification is for device in free air:
8-Lead Plastic DIP Package: θ 8-Lead SOIC Package: θ
8-Lead µSOIC Package: θJA = 200°C/W
= 95°C/W
JA
= 155°C/W
JA
V
Temperature Package Package Brand
Model Range Description Option Code
AD623AN –40°C to +85°C 8-Lead Plastic DIP N-8 AD623AR –40°C to +85°C 8-Lead SOIC SO-8 AD623ARM –40°C to +85°C 8-Lead µSOIC RM-8 J0A AD623AR-REEL –40°C to +85°C 13" Tape and Reel SO-8 AD623AR-REEL7 –40°C to +85°C 7" Tape and Reel SO-8 AD623ARM-REEL –40°C to +85°C 13" Tape and Reel RM-8 J0A AD623ARM-REEL7 –40°C to +85°C 7" Tape and Reel RM-8 J0A AD623BN –40°C to +85°C 8-Lead Plastic DIP N-8 AD623BR –40°C to +85°C 8-Lead SOIC SO-8 AD623BR-REEL –40°C to +85°C 13" Tape and Reel SO-8 AD623BR-REEL7 –40°C to +85°C 7" Tape and Reel SO-8
ESD SUSCEPTIBILITY
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 volts, which readily accumulate on the human body and on test equipment, can discharge without detection. Although the AD623 features proprietary ESD protection circuitry, permanent damage may still occur on these devices if they are subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid any performance degradation or loss of functionality.
–4–
REV. C
Typical Characteristics
INPUT OFFSET CURRENT – nA
150
0
–0.245 –0.21
UNITS
–0.24 –0.235 –0.23 –0.225 –0.22 –0.215
90
60
30
120
180
210
(@ +258C VS = 65 V, R
= 10 kV unless otherwise noted)
L
AD623
300 280 260 240 220 200 180 160 140
UNITS
120 100
80 60 40 20
0
–100
–80
–60 –20–40
INPUT OFFSET VOLTAGE – mV
20 120
140
1008060400
Figure 2. Typical Distribution of Input Offset Voltage; Package Option N-8, SO-8
480
420
360
300
240
UNITS
180
120
60
0
–800 –600
–400 –200
OUTPUT OFFSET VOLTAGE 2 mV
0 200 400 600 800
22 20 18
16 14 12 10
UNITS
8 6 4 2 0
–600
–300 –200 –100
–5000–400
OUTPUT OFFSET VOLTAGE – mV
100 200 300 400
500
Figure 5. Typical Distribution of Output Offset Voltage, V
= +5, Single Supply, V
S
= –0.125 V; Package Option
REF
N-8, SO-8
Figure 3. Typical Distribution of Output Offset Voltage; Package Option N-8, SO-8
22 20 18 16 14 12 10
UNITS
8
Figure 4. Typical Distribution of Input Offset Voltage, V
S
6 4 2 0
–80 –60
–40 –20
INPUT OFFSET VOLTAGE – mV
= +5, Single Supply, V
N-8, SO-8
0 20 40 60 80 100
= –0.125 V; Package Option
REF
Figure 6. Typical Distribution for Input Offset Current; Package Option N-8, SO-8
20 18 16 14 12 10
UNITS
8 6
4 2 0
–0.025
–0.02
–0.015 –0.01 –0.005
INPUT OFFSET CURRENT – nA
0 0.005
Figure 7. Typical Distribution for Input Offset Current,
= +5, Single Supply, V
V
S
= –0.125 V; Package Option
REF
N-8, SO-8
–5–REV. C
0.01
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