Datasheet AD8420 (Analog Devices) - 5

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Data Sheet AD8420
+VS = +15 V, −VS = −15 V, VREF = 0 V, TA = 25°C, G = 1 to 1000, RL = 20 kΩ, specifications referred to input, unless otherwise noted.
Table 3. Parameter Test Conditions/Comments Min Typ Max Unit
COMMON-MODE REJECTION RATIO (CMRR) VCM = −10 V to +10 V CMRR DC to 60 Hz 92 dB CMRR at 1 kHz 92 dB NOISE Voltage Noise Spectral Density f = 1 kHz, VDIFF ≤ 100 mV 55 nV/√Hz Peak to Peak f = 0.1 Hz to 10 Hz, VDIFF ≤ 100 mV 1.5 μV p-p Current Noise Spectral Density f = 1 kHz 80 fA/√Hz Peak to Peak f = 0.1 Hz to 10 Hz 3 pA p-p VOLTAGE OFFSET Offset VS = ±15 V1 250 μV Average Temperature Coefficient TA = −40°C to +85°C 1 μV/°C Offset RTI vs. Supply (PSR) VS = ±15 V 100 dB INPUTS Valid for REF and FB pair, as well as +IN and −IN Input Bias Current2 TA = +25°C 20 27 nA TA = +85°C 24 nA TA = −40°C 30 nA Average Temperature Coefficient TA = −40°C to +85°C 30 pA/°C Input Offset Current TA = +25°C 1 nA TA = +85°C 1 nA TA = −40°C 1 nA Average Temperature Coefficient TA = −40°C to +85°C 0.5 pA/°C Input Impedance Differential 130||3 MΩ||pF Common Mode 1000||3 MΩ||pF Differential Input Operating Voltage TA = −40°C to +85°C −1 1 V Input Operating Voltage (+IN, −IN, REF, or FB) TA = +25°C −VS − 0.15 +VS − 2.2 V TA = +85°C −VS − 0.05 +VS − 1.8 V TA = −40°C −VS − 0.2 +VS − 2.7 V DYNAMIC RESPONSE Small Signal −3 dB Bandwidth G = 1 250 kHz G = 10 25 kHz G = 100 2.5 kHz G =1000 0.25 kHz Settling Time 0.01% G = 1 −1 V to +1 V output step 3 μs G = 10 −5 V to +5 V output step 130 μs G = 100 −5 V to +5 V output step 1 ms Slew Rate 1 V/μs GAIN3 G = 1 + (R2/R1) Gain Range 1 1000 V/V Gain Error G = 1 VOUT = ±1 V 0.02 % G = 10 to 1000 VOUT = ±10 V 0.05 0.1 % Gain vs. Temperature TA = −40°C to +85°C 10 ppm/°C Rev. A | Page 5 of 26 Document Outline FEATURES APPLICATIONS PIN CONFIGURATION GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION ARCHITECTURE SETTING THE GAIN GAIN ACCURACY INPUT VOLTAGE RANGE INPUT PROTECTION Input Voltages Beyond the Rails Large Differential Input Voltage LAYOUT Common-Mode Rejection Ratio over Frequency Power Supplies Reference DRIVING THE REFERENCE PIN INPUT BIAS CURRENT RETURN PATH RADIO FREQUENCY INTERFERENCE (RFI) OUTPUT BUFFERING APPLICATIONS INFORMATION AD8420 IN ELECTROCARDIOGRAPHY (ECG) CLASSIC BRIDGE CIRCUIT 4 mA TO 20 mA SINGLE-SUPPLY RECEIVER OUTLINE DIMENSIONS ORDERING GUIDE