Datasheet AD8220 (Analog Devices) - 6

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AD8220 A Grade B Grade W Grade Parameter Test Conditions Min Typ Max Min Typ Max Min Typ Max Unit
POWER SUPPLY V Operating Range ±2.254 ±18 ±2.254 ±18 ±2.254 ±18 μA Quiescent Current TA 750 750 750 μA Over Temperature TOPR 850 850 1000 μA TEMPERATURE RANGE For Specified TOPR −40 +85 −40 +85 −40 +125 °C Performance 1 When the output sinks more than 4 mA, use a 47 pF capacitor in parallel with the load to prevent ringing. Otherwise, use a larger load, such as 10 kΩ. 2 Differential and common-mode input impedance can be calculated from the pin impedance: ZDIFF = 2(ZPIN); ZCM = ZPIN/2. 3 The AD8220 can operate up to a diode drop below the negative supply but the bias current increases sharply. The input voltage range reflects the maximum allowable voltage where the input bias current is within the specification. 4 At this supply voltage, ensure that the input common-mode voltage is within the input voltage range specification. VS + = 5 V, VS− = 0 V, VREF = 2.5 V, TA = 25°C, TOPR = −40°C to +85°C for A and B grades. TOPR = −40°C to +125°C for W grade, G = 1, RL = 2 kΩ1, unless otherwise noted.
Table 2. A Grade B Grade W Grade Parameter Test Conditions Min Typ Max Min Typ Max Min Typ Max Unit
COMMON-MODE REJECTION TA for A, B grades, RATIO (CMRR) TOPR for W grade CMRR DC to 60 Hz with VCM = 0 to 2.5 V 1 kΩ Source Imbalance G = 1 78 86 77 dB G = 10 94 100 92 dB G = 100 94 100 92 dB G = 1000 94 100 92 dB CMRR at 5 kHz VCM = 0 to 2.5 V G = 1 74 80 72 dB G = 10 84 90 80 dB G = 100 84 90 80 dB G = 1000 84 90 80 dB NOISE RTI noise = √(e 2 ni + (eno/G)2), TA Voltage Noise, 1 kHz VS = ±2.5 V Input Voltage Noise, eni VIN+, VIN− = 0 V, VREF = 14 14 17 14 nV/√Hz 0 V Output Voltage Noise, eno VIN+, VIN− = 0 V, VREF = 90 90 100 90 nV/√Hz 0 V RTI, 0.1 Hz to 10 Hz G = 1 5 5 5 μV p-p G = 1000 0.8 0.8 0.8 μV p-p Current Noise f = 1 kHz 1 1 1 fA/√Hz VOLTAGE OFFSET VOS = VOSI + VOSO/G Input Offset, VOSI TA −300 +300 −200 +200 −300 +300 μV Average TC TOPR −10 +10 −5 +5 −10 10 μV/°C Output Offset, VOSO TA −800 +800 −600 +600 −800 +800 μV Average TC TOPR −10 +10 −5 +5 −10 +10 μV/°C Offset RTI vs. Supply (PSR) TA for A, B grades, TOPR for W grade G = 1 86 86 80 dB G = 10 96 100 92 dB G = 100 96 100 92 dB G = 1000 96 100 92 dB Rev. B | Page 5 of 28 Document Outline Features Applications Pin Configuration General Description Revision History Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Gain Selection Layout Common-Mode Rejection Ratio (CMRR) Grounding Reference Terminal Power Supply Regulation and Bypassing Input Bias Current Return Path Input Protection RF Interference Common-Mode Input Voltage Range Driving an ADC Applications Information AC-Coupled Instrumentation Amplifier Differential Output Electrocardiogram Signal Conditioning Outline Dimensions Ordering Guide Automotive Products