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AD627AN-AD627AR-AD627BR
Micropower, Single and Dual Supply Rail-to-Rail Instrumentation Amplifier
REV.A
Micropower, Single and Dual Supply
Rail-to-Rail Instrumentation Amplifier
FUNCTIONAL BLOCK DIAGRAM
8-Lead Plastic DIP (N) and SOIC (R)
FEATURES
Micropower, 85 mA Max Supply Current
Wide Power Supply Range (+2.2 V to 618 V)
Easy to Use
Gain Set with One External Resistor
Gain Range 5 (No Resistor) to 1,000
Higher Performance than Discrete Designs
Rail-to-Rail Output Swing
High Accuracy DC Performance
0.10% Gain Accuracy (G = 5) (AD627A)
10 ppm Gain Drift (G = 5)
125 mV Max Input Offset Voltage (AD627B)
200 mV Max Input Offset Voltage (AD627A)
1 mV/8C Max Input Offset Voltage Drift (AD627B)
3 mV/8C Max Input Offset Voltage Drift (AD627A)
10 nA Max Input Bias Current
Noise: 38 nV/√Hz RTI Noise @ 1 kHz (G = 100)
Excellent AC Specifications
77 dB Min CMRR (G = 5) (AD627A)
83 dB Min CMRR (G = 5) (AD627B)
80 kHz Bandwidth (G = 5)
135 ms Settling Time to 0.01% (G = 5, 5 V Step)
APPLICATIONS
4 mA-to-20 mA Loop Powered Applications
Low Power Medical Instrumentation—ECG, EEG
Transducer Interfacing
Thermocouple Amplifiers
Industrial Process Controls
Low Power Data Acquisition
Portable Battery Powered Instruments
PRODUCT DESCRIPTIONThe AD627 is an integrated, micropower, instrumentation
amplifier that delivers rail-to-rail output swing on single and
dual (+2.2 V to –18 V) supplies. The AD627 provides the user
with excellent ac and dc specifications while operating at only
85 mA max.
The AD627 offers superior user flexibility by allowing the user
to set the gain of the device with a single external resistor, and
by conforming to the 8-lead industry standard pinout configura-
tion. With no external resistor, the AD627 is configured for a
gain of 5. With an external resistor, it can be programmed for
gains of up to 1000.
Wide supply voltage range (+2.2 V to –18 V), and micropower
current consumption make the AD627 a perfect fit for a wide
range of applications. Single supply operation, low power con-
sumption and rail-to-rail output swing make the AD627 ideal
for battery powered applications. Its rail-to-rail output stage
maximizes dynamic range when operating from low supply
voltages. Dual supply operation (–15 V) and low power con-
sumption make the AD627 ideal for industrial applications,
including 4 mA-to-20 mA loop-powered systems.
The AD627 does not compromise performance, unlike other
micropower instrumentation amplifiers. Low voltage offset,
offset drift, gain error, and gain drift keep dc errors to a mini-
mum in the users system. The AD627 also holds errors over
frequency to a minimum by providing excellent CMRR over
frequency. Line noise, as well as line harmonics, will be rejected,
since the CMRR remains high up to 200 Hz.
The AD627 provides superior performance, uses less circuit
board area and does it for a lower cost than micropower discrete
designs.
Figure 1.CMRR vs. Frequency, –5 VS, Gain = 5
AD627–SPECIFICATIONS
SINGLE SUPPLY(typical @ +258C Single Supply, VS = +3 V and +5 V and RL = 20 kV, unless otherwise noted)INPUT CURRENT
DYNAMIC RESPONSE
AD627
DUAL SUPPLY(typical @ +258C Dual Supply, VS = 65 V and 615 V and RL = 20 kV, unless otherwise noted)INPUT CURRENT
OUTPUT
DYNAMIC RESPONSE
AD627–SPECIFICATIONS
ORDERING GUIDE
BOTH DUAL AND SINGLE SUPPLIESREFERENCE INPUT
TEMPERATURE RANGE
NOTESSee Applications section for input range, gain range and common-mode range.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS1Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–18 V
Internal Power Dissipation2
Plastic Package (N) . . . . . . . . . . . . . . . . . . . . . . . . . .1.3 W
Small Outline Package (R) . . . . . . . . . . . . . . . . . . . . .0.8 W
–IN, +IN . . . . . . . . . . . . . . . . . . . . .–VS – 20 V to +VS + 20 V
Common-Mode Input Voltage . . . .–VS – 20 V to +VS + 20 V
Differential Input Voltage (+IN – (–IN)) . . . . . . . .+VS – (–VS)
Output Short Circuit Duration . . . . . . . . . . . . . . . .Indefinite
Storage Temperature Range N, R . . . . . . . .–65°C to +125°C
Operating Temperature Range . . . . . . . . . . .–40°C to +85°C
Lead Temperature Range (Soldering 10 sec) . . . . . . . .+300°C
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
NOTESStresses 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.Specification is for device in free air:
8-Lead Plastic DIP Package: qJA = 90°C/W.
8-Lead SOIC Package: qJA = 155°C/W.
Typical Performance Characteristics(@ +258C VS = 65 V, RL = 20 kV unless otherwise noted)
FREQUENCY – Hz
NOISE – nV/ Hz, RTI1001k10k100kFigure 2.Voltage Noise Spectral Density vs. Frequency
FREQUENCY – Hz
CURRENT NOISE – fA/ Hz1001k10kFigure 3.Current Noise Spectral Density vs. Frequency
COMMON-MODE INPUT – Volts
INPUT BIAS CURRENT – nA0510
–2.200Figure 4. IBIAS vs. CMV, VS = –15 V
TEMPERATURE – 8C
INPUT BIAS CURRENT – nA
–3.0Figure 5.Input Bias Current vs. Temperature
TOTAL POWER SUPPLY VOLTAGE – Volts
POWER SUPPLY CURRENT – 1520253035
60.5Figure 6.Supply Current vs. Supply Voltage
Figure 7.Output Voltage Swing vs. Output Current
AD627Figure 8.0.1 Hz to 10 Hz Current Noise (0.71 pA/DIV)
Figure 9.0.1 Hz to 10 Hz RTI Voltage Noise (400 nV/DIV),
G = 5
Figure 10.0.1 Hz to 10 Hz RTI Voltage Noise (200 nV/DIV),
G = 1000
Figure 11.Positive PSRR vs. Frequency, –5 V
FREQUENCY – Hz
PSRR – dB1001k10k100kFigure 12.Negative PSRR vs. Frequency, –5 V
Figure 13.Positive PSRR vs. Frequency (VS = +5 V, 0 V)
GAIN – V/V
51k
SETTLING TIME – ms
10010Figure 14.Settling Time to 0.01% vs. Gain for a 5 V Step
at Output, RL = 20 kW, CL = 100 pF, VS = –5 V
Figure 15.Large Signal Pulse Response and Settling
Time, G = –5, RL = 20 kW, CL = 100 pF (1.5 mV = 0.01%)
Figure 16.Large Signal Pulse Response and Settling
Time, G = –10, RL = 20 kW, CL = 100 pF (1.0 mV = 0.01%)
Figure 17.Settling Time to 0.01% vs. Output Swing,
G = 5, RL = 20 kW, CL = 100 pF
Figure 18.Large Signal Pulse Response and Settling
Time, G = –100, RL = 20 kW, CL = 100 pF (100 mV = 0.01%)
Figure 19.Large Signal Pulse Response and Settling
Time, G = –1000, RL = 20 kW, CL = 100 pF (10 mV = 0.01%)
AD627
FREQUENCY – Hz
CMRR – dB101k10k100k
100Figure 20.CMRR vs. Frequency, –5 VS, (CMV = 200 mV p-p)
FREQUENCY – Hz
GAIN – dB
1001k10k100kFigure 21.Gain vs. Frequency (VS = +5 V, 0 V), VREF = 2.5 V
Figure 22.Small Signal Pulse Response, G = +5,
RL = 20 kW, CL = 50 pF
Figure 23.Small Signal Pulse Response, G = +10,
RL = 20 kW, CL = 50 pF
Figure 24.Small Signal Pulse Response, G = +100,
RL = 20 kW, CL = 50 pF
Figure 25.Small Signal Pulse Response,
G = +1000, RL = 20 kW, CL = 50 pF
