Datasheet AD8237 (Analog Devices) - 5

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Data Sheet AD8237
+VS = 1.8 V, −VS = 0 V, VREF = 0.9 V, VCM = 0.9 V, TA = 25°C, G = 1 to 1000, RL = 10 kΩ to ground, specifications referred to input, unless otherwise noted.
Table 3. Parameter Test Conditions/Comments Min Typ Max Unit
COMMON-MODE REJECTION RATIO (CMRR) V = 0.2 V to 1.6 V CM CMRR at DC G = 1, G = 10 100 120 dB G = 100, G = 1000 114 140 dB Over Temperature (G = 1) T = −40°C to +125°C 94 dB A CMRR at 1 kHz 80 dB NOISE Voltage Noise Spectral Density f = 1 kHz, V ≤ 100 mV 68 nV/√Hz DIFF Peak to Peak f = 0.1 Hz to 10 Hz, V ≤ 100 mV 1.5 µV p-p DIFF Current Noise Spectral Density f = 1 kHz 70 fA/√Hz Peak to Peak f = 0.1 Hz to 10 Hz 3 pA p-p VOLTAGE OFFSET Offset 25 75 µV Average Temperature Coefficient T = −40°C to +125°C 0.3 µV/°C A Offset RTI vs. Supply (PSR) 100 dB INPUTS1 Valid for REF and FB pair, as well as +IN and −IN Input Bias Current T = +25°C 250 650 pA A Over Temperature T = −40°C to +125°C 1 nA A Average Temperature Coefficient 0.5 pA/°C Input Offset Current T = +25°C 250 650 pA A Over Temperature T = −40°C to +125°C 1 nA A Average Temperature Coefficient 0.5 pA/°C Input Impedance Differential 100||5 MΩ||pF Common Mode 800||10 MΩ||pF Differential Input Operating Voltage T = −40°C to +125°C ± 0.75 V A Input Operating Voltage (+IN, −IN, REF, or FB) T = +25°C −V − 0.3 +V + 0.3 V A S S T = −40°C to +125°C −V − 0.2 +V + 0.2 V A S S DYNAMIC RESPONSE Small Signal Bandwidth −3 dB Low Bandwidth Mode Pin 1 connected to −V S G = 1 200 kHz G = 10 20 kHz G = 100 2 kHz G = 1000 0.2 kHz High Bandwidth Mode Pin 1 connected to +V S G = 10 100 kHz G = 100 10 kHz G = 1000 1 kHz Slew Rate Low Bandwidth Mode 0.05 V/µs High Bandwidth Mode 0.15 V/µs EMI Filter Frequency 6 MHz Rev. 0 | Page 5 of 28 Document Outline Features Applications General Description Pin Configuration 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 Clock Feedthrough Input Voltage Range Input Protection Filtering Radio Frequency Interference Using the Reference Pin Layout Common-Mode Rejection Ratio over Frequency Power Supplies Reference Input Bias Current Return Path Applications Information Battery Current Monitor Programmable Gain In-Amp AD8237 in an ECG Front End Outline Dimensions Ordering Guide