AD8508ARUZ-REEL

AD8506_07 AD | Alldatasheet

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Rev. A | Page 2 of 20 TABLE OF CONTENTS Four-Pole Low-Pass Butterworth Filter for

REVISION HISTORY

7/08—Rev. 0 to Rev. A Changes to Features Section and General Description Section . 1 Changed Electrical Characteristics Heading to Electrical Changes to Table 3, Thermal Resistance Section, and Table 4 ... 5 Added T A = 25°C Condition to Typical Performance Added Theory of Operation Section, Figure 41, and 11/07—Revision 0: Initial Version

Rev. A | Page 3 of 20 SPECIFICATIONS ELECTRICAL CHARACTERISTICS—5 V OPERATION VSY = 5 V , VCM = VSY/2, TA = 25°C, RL = 100 kΩ to GND, unless otherwise noted. Table 1. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage VOS 0 V ≤ V CM ≤ 5 V 0.5 2.5 mV 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 130 pA Input Voltage Range −40°C ≤ TA ≤ +125°C 0 5 V Common-Mode Rejection Ratio CMRR 0 V ≤ V CM ≤ 5 V 90 105 dB −40°C ≤ TA ≤ +85°C 90 dB −40°C ≤ TA ≤ +125°C 85 dB Large Signal Voltage Gain AVO 0.05 V ≤ V OUT ≤ 4.95 V 105 120 dB −40°C ≤ TA ≤ +125°C 100 dB Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 2 μV/°C Input Capacitance Differential Mode CDIFF 3 pF Input Capacitance Common Mode CCM 4.2 pF OUTPUT CHARACTERISTICS Output Voltage High VOH R L = 100 kΩ to GND 4.98 4.99 V RL = 10 kΩ to GND 4.9 4.95 V Output Voltage Low VOL R L = 100 kΩ to VSY 2 5 mV −40°C ≤ TA ≤ +125°C 5 mV RL = 10 kΩ to VSY 10 25 mV −40°C ≤ TA ≤ +125°C 30 mV Short-Circuit Limit ISC V OUT = VSY or GND ±45 mA POWER SUPPLY Power Supply Rejection Ratio PSRR V SY = 1.8 V to 5 V 100 110 dB −40°C ≤ TA ≤ +85°C 100 dB −40°C ≤ TA ≤ +125°C 95 dB Supply Current per Amplifier I SY V OUT = VSY/2 15 20 μA −40°C ≤ TA ≤ +125°C 25 μA DYNAMIC PERFORMANCE Slew Rate SR R L = 100 kΩ, CL = 10 pF, G = 1 13 mV/μs Gain Bandwidth Product GBP R L = 1 MΩ, CL = 20 pF, G = 1 95 kHz Phase Margin ΦM R L = 1 MΩ, CL = 20 pF, G = 1 60 Degrees NOISE PERFORMANCE Voltage Noise en p-p f = 0.1 Hz to 10 Hz 2.8 μV p-p Voltage Noise Density en f = 1 kHz 45 nV/√Hz Current Noise Density in f = 1 kHz 15 fA/√Hz

Rev. A | Page 4 of 20 ELECTRICAL CHARACTERISTICS—1.8 V OPERATION VSY = 1.8 V , VCM = VSY/2, TA = 25°C, RL = 100 kΩ to GND, unless otherwise noted. Table 2. Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage VOS 0 V ≤ V CM ≤ 1.8 V 0.5 2.5 mV 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 Input Voltage Range −40°C ≤ TA ≤ +125°C 0 1.8 V Common-Mode Rejection Ratio CMRR 0 V ≤ V CM ≤ 1.8 V 85 100 dB −40°C ≤ TA ≤ +85°C 85 dB −40°C ≤ TA ≤ +125°C 80 dB Large Signal Voltage Gain AVO 0.05 V ≤ V OUT ≤ 1.75 V 95 115 dB −40°C ≤ TA ≤ +125°C 95 dB Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 2.5 μV/°C Input Capacitance Differential Mode CDIFF 3 pF Input Capacitance Common Mode CCM 4.2 pF OUTPUT CHARACTERISTICS Output Voltage High VOH R L = 100 kΩ to GND 1.78 1.79 V RL = 10 kΩ to GND 1.65 1.75 V Output Voltage Low VOL R L = 100 kΩ to VSY 2 5 mV −40°C ≤ TA ≤ +125°C 5 mV RL = 10 kΩ to VSY 12 25 mV −40°C ≤ TA ≤ +125°C 25 mV Short-Circuit Limit ISC V OUT = VSY or GND ±4.5 mA POWER SUPPLY Power Supply Rejection Ratio PSRR V SY = 1.8 V to 5 V 100 110 dB −40°C ≤ TA ≤ +85°C 100 dB −40°C ≤ TA ≤ +125°C 95 dB Supply Current per Amplifier I SY V OUT = VSY/2 16.5 20 μA −40°C ≤ TA ≤ +125°C 25 μA DYNAMIC PERFORMANCE Slew Rate SR R L = 100 kΩ, CL = 10 pF, G = 1 13 mV/μs Gain Bandwidth Product GBP R L = 1 MΩ, CL = 20 pF, G = 1 95 kHz Phase Margin ΦM RL = 1 MΩ, CL = 20 pF, G = 1 60 Degrees NOISE PERFORMANCE Voltage Noise en p-p f = 0.1 Hz to 10 Hz 2.8 μV p-p Voltage Noise Density en f = 1 kHz 45 nV/√Hz Current Noise Density in f = 1 kHz 15 fA/√Hz

2 Differential input voltage is limited to 5 V or the supply voltage, whichever

was measured using a standard two-layer board. Table 4. Thermal Resistance

adjustments may be required. Figure 45. Pulse Oximeter Red and Infrared Current Sources Using the

10 Hz and voltage noise density of 45 nV/√Hz at 1 kHz. maximum of input bias current at ambient temperature. Figure 46. A Four-Pole Butterworth Filter That Can Be Used in a Glucose Meter

0.65 BSC

1.10 MAX

Figure 47. 8-Lead Mini Small Outline Package [MSOP] Figure 48. 14-Lead Thin Shrink Small Outline Package [TSSOP]

Rev. A | Page 18 of 20 NOTES

Rev. A | Page 19 of 20 NOTES

Rev. A | Page 20 of 20 NOTES ©2007–2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the prop erty of their respective owners. D06900-0-7/08(A)