Datasheet AD8428-KGD (Analog Devices)

Low Noise, Low Gain Drift, G = 2000, Instrumentation Amplifier Data Sheet AD8428-KGD FEATURES FUNCTIONAL BLOCK DIAGRAM +V Fixed gain of 2000 S –FIL Access to internal nodes provides flexibility –IN Low noise: 1.5 nV/√Hz voltage noise 6kΩ 6kΩ 120kΩ High accuracy dc performance 3kΩ Gain drift: 10 ppm/°C maximum 30.15Ω OUT Input offset voltage, average temperature coefficient: 1 μV/°C maximum 3kΩ Total gain error: 0.2% maximum 6kΩ 6kΩ 120kΩ REF CMRR, dc to 60 Hz: 130 dB minimum +IN AD8428-KGD Excellent ac specifications
001
−3 dB small signal bandwidth: 3.5 MHz –V
63-
S +FIL
202
Slew rate: 40 V/μs minimum
Figure 1.
Power supply operating range: ±4 V to ±18 V ESD protection: 5000 V (HBM) Temperature range for specified performance: −40°C to +85°C Operational up to 125°C Known Good Die (KGD): these die are fully guaranteed to data sheet specifications. APPLICATIONS Sensor interface Medical instrumentation Patient monitoring GENERAL DESCRIPTION
The AD8428-KGD is an ultralow noise instrumentation amplifier The AD8428-KGD uses a current feedback topology for the (in-amp) designed to accurately measure small, high speed signals. initial preamplifier gain stage of 200, followed by a difference All gain setting resistors for the AD8428-KGD are internal to amplifier stage of 10. This architecture results in a 3.5 MHz the device and are precisely matched. Care is taken in both the bandwidth at a gain of 2000. chip pinout and layout that results in excellent gain drift and The AD8428-KGD pin configuration allows access to internal quick settling to the final gain value after the device powers on. nodes between the first and second stages. This feature can be The high common-mode rejection ratio (CMRR) of the useful for modifying the frequency response between the two AD8428-KGD prevents unwanted signals from corrupting the amplification stages, thereby preventing unwanted signals from signal of interest. The pin configuration of the AD8428-KGD is contaminating the output results. designed to avoid parasitic capacitance mismatches that can The performance of the AD8428-KGD is specified from −40°C degrade CMRR at high frequencies. to +85°C and operational to 125°C. The AD8428-KGD is one of the fastest in-amps available. The Additional application and technical information can be found circuit architecture is designed for high bandwidth at high gain. in the AD8428 data sheet.
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS OUTLINE DIMENSIONS DIE SPECIFICATIONS AND ASSEMBLY RECOMMENDATIONS ORDERING GUIDE