40 μA Micropower Instrumentation Amplifier in WLCSP Package
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20 /10 — AD8235. Data Sheet. 120. GAIN = 100. 100. GAIN = 10. GAIN = 200. GAIN = …
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AD8235. Data Sheet. 120. GAIN = 100. 100. GAIN = 10. GAIN = 200. GAIN = 5. RR (. S P. MR C. –10. 0.1. 10k. 100k. –40. –20. FREQUENCY (Hz). TEMPERATURE (°C)
AD8235Data Sheet12010GAIN = 1001005GAIN = 1080GAIN = 200B)GAIN = 5V)dV/60(µ0RR (RS PMR C40–5200–100.11101001k10k100k 011 –40–20020406080100120 014 FREQUENCY (Hz)TEMPERATURE (°C) 08211- 08211- Figure 11. Negative PSRR vs. Frequency, RTI, VS = ±0.9 V, ±2.5 V, VREF = 0 V Figure 14. Change in CMRR vs. Temperature, G = 5, Normalized at 25°C 1206050GAIN = 20010040GAIN = 1003080GAIN = 10B)20dB) d60GAIN = 200RR (N (10GAIN = 5AICMGAIN = 100G040GAIN = 10–10–2020GAIN = 5–300–400.11101001k10k100k 012 101001k10k100k1M 015 FREQUENCY (Hz) 08211- FREQUENCY (Hz) 08211- Figure 12. CMRR vs. Frequency, RTI Figure 15. Gain vs. Frequency, VS = 1.8 V, 5 V 12061005804)B) d-p60GAIN = 200RR ((V p 3GAIN = 100UTCMOV402201GAIN = 5GAIN = 10000.11101001k10k100k 013 1101001k10k100k 016 FREQUENCY (Hz) 08211- FREQUENCY (Hz) 08211- Figure 13. CMRR vs. Frequency, 1 kΩ Source Imbalance, RTI Figure 16. Maximum Output Voltage vs. Frequency Rev. A | Page 10 of 20 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION CONNECTION DIAGRAM PIN CONFIGURATION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION BASIC OPERATION GAIN SELECTION SHUTDOWN FEATURE LAYOUT RECOMMENDATIONS Pad Opening Pad Type Pad Finish Board Thickness Grounding REFERENCE TERMINAL POWER SUPPLY REGULATION AND BYPASSING INPUT BIAS CURRENT RETURN PATH INPUT PROTECTION RF INTERFERENCE COMMON-MODE INPUT VOLTAGE RANGE APPLICATIONS INFORMATION AC-COUPLED INSTRUMENTATION AMPLIFIER LOW POWER HEART RATE MONITOR OUTLINE DIMENSIONS ORDERING GUIDE