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AD627
Micro-power Instrumentation Amplifier Offers Superior Performance
REV.B
Micropower, Single and Dual Supply
Rail-to-Rail Instrumentation Amplifier
FUNCTIONAL BLOCK DIAGRAM
8-Lead Plastic DIP (N) and SOIC (R)
FEATURES
Micropower, 85 �A Max Supply Current
Wide Power Supply Range (+2.2 V to �18 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 �V Max Input Offset Voltage (AD627B)
200 �V Max Input Offset Voltage (AD627A)
1 �V/�C Max Input Offset Voltage Drift (AD627B)
3 �V/�C 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 �s 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 µA 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 maxi-
mizes dynamic range when operating from low supply voltages.
Dual supply operation (±15 V) and low power consumption 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 minimum 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 @ 25�C Single Supply, VS = 3 V and 5 V and RL = 20 k�, unless otherwise noted.)INPUT CURRENT
OUTPUT
DYNAMIC RESPONSE
AD627
DUAL SUPPLY(Typical @ 25�C Dual Supply, VS = �5 V and �15 V and RL = 20 k�, unless otherwise noted.)INPUT CURRENT
AD627–SPECIFICATIONS
ORDERING GUIDE
BOTH DUAL AND SINGLE SUPPLIESNOTESSee 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: θJA = 90°C/W.
8-Lead SOIC Package: θJA = 155°C/W.
Typical Performance Characteristics(@ 25�C VS = �5 V, RL = 20 k� unless otherwise noted.)TPC 1.Voltage Noise Spectral Density vs. Frequency
TPC 2.Current Noise Spectral Density vs. Frequency
COMMON-MODE INPUT – Volts
INPUT BIAS CURRENT
nA0510
–2.200TPC 3.IBIAS vs. CMV, VS = ±15 V
TPC 4.Input Bias Current vs. Temperature
TOTAL POWER SUPPLY VOLTAGE – Volts
POWER SUPPLY CURRENT 1520253035
60.5TPC 5.Supply Current vs. Supply Voltage
TPC 6.Output Voltage Swing vs. Output Current
AD627TPC 7.0.1 Hz to 10 Hz Current Noise (0.71 pA/DIV)
TPC 8.0.1 Hz to 10 Hz RTI Voltage Noise (400 nV/DIV),
G = +5
TPC 9.0.1 Hz to 10 Hz RTI Voltage Noise (200 nV/DIV),
G = +1000
TPC 10.Positive PSRR vs. Frequency, ±5 V
FREQUENCY – Hz
PSRR
dB1001k10k100kTPC 11.Negative PSRR vs. Frequency, ±5 V
TPC 12.Positive PSRR vs. Frequency (VS = 5 V, 0 V)
GAIN – V/V
51k
SETTLING TIME
ms
10010TPC 13.Settling Time to 0.01% vs. Gain for a 5 V Step at
Output, RL = 20 kΩ, CL = 100 pF, VS = ±5 V
TPC 14.Large Signal Pulse Response and Settling
Time, G = –5, RL = 20 kΩ, CL = 100 pF (1.5 mV = 0.01%)
TPC 15.Large Signal Pulse Response and Settling
Time, G = –10, RL = 20 kΩ, CL = 100 pF (1.0 mV = 0.01%)
TPC 16.Settling Time to 0.01% vs. Output Swing,
G = +5, RL = 20 kΩ, CL = 100 pF
TPC 17.Large Signal Pulse Response and Settling
Time, G = –100, RL = 20 kΩ, CL = 100 pF (100 µV = 0.01%)
TPC 18.Large Signal Pulse Response and Settling
Time, G = –1000, RL = 20 kΩ, CL = 100 pF (10 µV = 0.01%)
AD627
FREQUENCY – Hz
CMRR
dB101k10k100k
100TPC 19.CMRR vs. Frequency, ±5 VS, (CMV = 200 mV p-p)
TPC 20.Gain vs. Frequency (VS = 5 V, 0 V), VREF = 2.5 V
TPC 21.Small Signal Pulse Response, G = +5,
RL = 20 kΩ, CL = 50 pF
TPC 22.Small Signal Pulse Response, G = +10,
RL = 20 kΩ, CL = 50 pF
TPC 23.Small Signal Pulse Response, G = +100,
RL = 20 kΩ, CL = 50 pF
TPC 24.Small Signal Pulse Response,
G = +1000, RL = 20 kΩ, CL = 50 pF
