AD8500 AD | Alldatasheet

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Technical content

Rev. A 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. Trademarks and registered trademarks are the property of their respective owners. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved.

FEATURES

Supply current: 1 μA maximum Offset voltage: 1 mV maximum Single-supply or dual-supply operation Rail-to-rail input and output No phase reversal Unity gain stable

APPLICATIONS

The AD8500 is a low power, precision CMOS op amp featuring a maximum supply current of 1 μA. The AD8500 has a maximum offset voltage of 1 mV and a typical input bias current of 1 pA; it operates rail-to-rail on both the input and output. The AD8500 can operate from a single-supply voltage of +1.8 V to +5.5 V or a dual-supply voltage of ±0.9 V to ±2.75 V . With its low power consumption, low input bias current, and rail-to-rail input and output, the AD8500 is ideally suited for a variety of battery-powered portable applications. Potential applications include ECGs, pulse monitors, glucose meters, smoke and fire detectors, vibration monitors, and backup battery sensors. PIN CONFIGURATION AD8500 TOP VIEW (Not to Scale) OUT A 1 V– 2 +IN 3 –IN 06005-001 Figure 1. 5-Lead SC70 without the need for system calibration. in a 5-lead, SC70 surface-mount package.

Rev. A | Page 2 of 12 TABLE OF CONTENTS

REVISION HISTORY

8/06—Rev. 0 to Rev. A 4/06—Revision 0: Initial Version

Rev. A | Page 3 of 12 SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

@ VS = 5 V , VCM = VS/2, TA = 25°C, unless otherwise noted. Table 1. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage VOS 0 V < VCM < 5 V 0.235 1 mV Offset Voltage Drift ∆VOS/∆T −40°C < TA < +85°C 3 10 μV/°C Input Voltage Range −0.3 +5.3 V Input Bias Current IB 1 10 pA −40°C < TA < +85°C 100 pA −40°C < TA < +125°C 600 pA Input Offset Current IOS 0.5 5 pA −40°C < TA < +85°C 50 pA −40°C < TA < +125°C 100 pA Common-Mode Rejection Ratio CMRR 0 V < VCM < 5 V 75 90 dB −40°C < TA < +85°C 70 90 dB Large Signal Voltage Gain AVO 0.1 V < VOUT < 4.9 V 98 120 dB 0.1 V < VOUT < 4.9 V; −40°C < TA < +85°C 80 dB Input Capacitance CDIFF 2 pF C CM 4.5 pF OUTPUT CHARACTERISTICS Output Voltage High VOH RLOAD = 100 kΩ to GND 4.970 4.995 V RLOAD = 10 kΩ to GND 4.900 4.960 V Output Voltage Low VOL RLOAD = 100 kΩ to VS 0.85 5 mV RLOAD = 10 kΩ to VS 6.5 15 mV Short-Circuit Current ISC VOUT = GND ±5 mA POWER SUPPLY Power Supply Rejection Ratio PSRR 1.8 V < VS < 5 V 90 110 dB −40°C < TA < +85°C 80 dB Supply Current/Amplifier ISY VO = VS/2 0.75 1 μA −40°C < TA < +125°C 2 μA DYNAMIC PERFORMANCE Slew Rate SR 0.004 V/μs Gain Bandwidth Product GBP 7 kHz Phase Margin ØO 60 Degrees NOISE PERFORMANCE Peak-to-Peak Noise 0.1 Hz to 10 Hz 6 μV p-p Voltage Noise Density en f = 1 kHz 190 nV/√Hz Current Noise Density in f = 1 kHz 0.1 pA/√Hz

Rev. A | Page 4 of 12 @ VS = 1.8 V , VCM = VS/2, TA = 25°C, unless otherwise noted. Table 2. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage VOS 0 V < VCM < 1.8 V 0.235 1 mV Offset Voltage Drift ∆VOS/∆T −40°C < TA < +85°C 3.5 12 μV/°C Input Voltage Range −0.3 +2.1 V Input Bias Current IB 1 10 pA −40°C < TA < +85°C 100 pA −40°C < TA < +125°C 600 pA Input Offset Current IOS 0.5 5 pA −40°C < TA < +85°C 50 pA −40°C < TA < +125°C 100 pA Common-Mode Rejection Ratio CMRR 0 V < VCM < 1.8 V 65 85 dB −40°C < TA < +85°C 60 83 dB Large Signal Voltage Gain AVO 0.1 V < VOUT < 1.7 V 88 115 dB 0.1 V < VOUT < 1.7 V; −40°C < TA < +85°C 70 dB Input Capacitance CDIFF 2 pF C CM 4.5 pF OUTPUT CHARACTERISTICS Output Voltage High VOH RLOAD = 100 kΩ to GND 1.790 1.798 V RLOAD = 10 kΩ to GND 1.760 1.783 V Output Voltage Low VOL RLOAD = 100 kΩ to VS 0.70 5 mV RLOAD = 10 kΩ to VS 5 15 mV Short-Circuit Current ISC ±2 mA POWER SUPPLY Power Supply Rejection Ratio PSRR 1.8 V < VS < 5 V 90 110 dB −40°C < TA < +85°C 80 dB Supply Current/Amplifier ISY VO = VS/2 0.65 1 μA −40°C < TA < +125°C 2 μA DYNAMIC PERFORMANCE Slew Rate SR 0.004 V/μs Gain Bandwidth Product GBP 7 kHz Phase Margin ØO 60 Degrees NOISE PERFORMANCE Peak-to-Peak Noise 0.1 Hz to 10 Hz 6 μV p-p Voltage Noise Density en f = 1 kHz 190 nV/√Hz Current Noise Density in f = 1 kHz 0.1 pA/√Hz

TA = 25°C, unless otherwise noted. soldered in a circuit board for surface-mount packages. Table 4. Thermal Characteristics degradation or loss of functionality.

0.10 MAX

0.65 BSC

0.10 COPLANARITY

Figure 38. 5-Lead Thin Shrink Small Outline Transistor Package [SC70] registered trademarks are the property of their respective owners.