AD8638 Datasheet PDF - Analog Devices
| Part Number | AD8638 | |
| Description | Operational Amplifiers | |
| Manufacturers | Analog Devices | |
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16 V Auto-Zero, Rail-to-Rail Output
Operational Amplifiers
AD8638/AD8639
FEATURES
Low offset voltage: 9 μV maximum
Offset drift: 0.04 μV/°C maximum
Rail-to-rail output swing
5 V to 16 V single-supply or ±2.5 V to ±8 V dual-supply
operation
High gain: 136 dB typical
High CMRR: 133 dB typical
High PSRR: 143 dB typical
Very low input bias current: 40 pA maximum
Low supply current: 1.3 mA maximum
AD8639: qualified for automotive applications
APPLICATIONS
Pressure and position sensors
Strain gage amplifiers
Medical instrumentation
Thermocouple amplifiers
Automotive sensors
Precision references
Precision current sensing
GENERAL DESCRIPTION
The AD8638/AD8639 are single and dual wide bandwidth,
auto-zero amplifiers featuring rail-to-rail output swing and low
noise. These amplifiers have very low offset, drift, and bias
current. Operation is fully specified from 5 V to 16 V single
supply (±2.5 V to ±8 V dual supply).
The AD8638/AD8639 provide benefits previously found only
in expensive zero-drift or chopper-stabilized amplifiers. Using
the Analog Devices, Inc., topology, these auto-zero amplifiers
combine low cost with high accuracy and low noise. No exter-
nal capacitors are required. In addition, the AD8638/AD8639
greatly reduce the digital switching noise found in most chopper-
stabilized amplifiers.
With a typical offset voltage of only 3 μV, drift of 0.01 μV/°C,
and noise of 1.2 μV p-p (0.1 Hz to 10 Hz), the AD8638/AD8639
are suited for applications in which error sources cannot be
tolerated. Position and pressure sensors, medical equipment,
and strain gage amplifiers benefit greatly from nearly zero drift
over their operating temperature ranges. Many systems can take
advantage of the rail-to-rail output swing provided by the
AD8638/AD8639 to maximize signal-to-noise ratio (SNR).
PIN CONFIGURATIONS
OUT 1
5 V+
AD8638
V– 2 TOP VIEW
(Not to Scale)
+IN 3
4 –IN
Figure 1. 5-Lead SOT-23 (RJ-5)
NC 1
8 NC
–IN 2 AD8638 7 V+
+IN 3 TOP VIEW 6 OUT
V– 4 (Not to Scale) 5 NC
NC = NO CONNECT
Figure 2. 8-Lead SOIC_N (R-8)
OUT A 1
–IN A 2
+IN A 3
V– 4
AD8639
TOP VIEW
(Not to Scale)
8 V+
7 OUT B
6 –IN B
5 +IN B
Figure 3. 8-Lead MSOP (RM-8)
8-Lead SOIC_N (R-8)
OUT A 1
–IN A 2
+IN A 3
v– 4
PIN 1
INDICATOR
AD8639
TOP VIEW
(Not to Scale)
8 V+
7 OUT B
6 –IN B
5 +IN B
NOTES
1. PIN 4 AND THE EXPOSED PAD
MUST BE CONNECTED TO V–.
Figure 4. 8-Lead LFCSP_WD (CP-8-5)
The AD8638/AD8639 are specified for the extended industrial
temperature range (−40°C to +125°C). The single AD8638 is
available in tiny 5-lead SOT-23 and 8-lead SOIC packages.
The dual AD8639 is available in 8-lead MSOP, 8-lead SOIC, and
8-lead LFCSP packages. See the Ordering Guide for automotive
grades.
The AD8638/AD8639 are members of a growing series of auto-
zero op amps offered by Analog Devices (see Table 1).
Table 1. Auto-Zero Op Amps
Supply 2.7 V to 5 V 2.7 V to 5 V Low Power
Single AD8628
AD8538
Dual AD8629
AD8539
Quad AD8630
5 V to 16 V
AD8638
AD8639
Rev. F
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 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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2007–2010 Analog Devices, Inc. All rights reserved.
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ABSOLUTE MAXIMUM RATINGS
Table 4.
Parameter
Supply Voltage
Input Voltage
Input Current1
Differential Input Voltage2
Output Short-Circuit Duration to GND
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature (Soldering, 60 sec)
Rating
16 V
GND − 0.3 V to VSY+ + 0.3 V
±10 mA
±VSY
Indefinite
−65°C to +150°C
−40°C to +125°C
−65°C to +150°C
300°C
1 Input pins have clamp diodes to the supply pins. Input current should be
limited to 10 mA or less whenever input signals exceed either power supply
rail by 0.3 V.
2 Inputs are protected against high differential voltages by internal 1 kΩ series
resistors and back-to-back diode-connected N-MOSFETs (with a typical VT of
1.25 V for VCM of 0 V).
Stresses above those listed under Absolute Maximum Ratings
may cause permanent 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.
AD8638/AD8639
THERMAL RESISTANCE
Table 5. Thermal Resistance
Package Type
θJA1
θJC
Unit
5-Lead SOT-23 (RJ-5)
230 146 °C/W
8-Lead SOIC_N (R-8)
158 43
°C/W
8-Lead MSOP (RM-8)
206 44
°C/W
8-Lead LFCSP_WD (CP-8-5)2 75 18 °C/W
1 θJA is specified for the worst-case conditions, that is, a device soldered in a
circuit board for surface-mount packages. This was measured using a
standard two-layer board.
2 Exposed pad is soldered to the application board.
ESD CAUTION
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