Datasheet LTC6373 (Analog Devices)

LTC6373 36V Fully-Differential Programmable-Gain Instrumentation Amplifier with 25pA Input Bias Current
FEATURES DESCRIPTION
n Pin-Programmable Gains: The LTC®6373 is a precision instrumentation amplifier G = 0.25, 0.5, 1, 2, 4, 8, 16V/V + Shutdown with fully differential outputs which includes a closely- n Fully Differential Outputs matched internal resistor network to achieve excellent n Gain Error: 0.012% (Max) CMRR, offset voltage, gain error, gain drift, and gain non- n Gain Error Drift: 1ppm/°C (Max) linearity. The user can easily program the gain to one n CMRR: 103dB (Min), G = 16 of seven available settings through a 3-bit parallel inter- n Input Bias Current: 25pA (Max) face (A2 to A0). The 8th state puts the part in shutdown n Input Offset Voltage: 92μV (Max), G = 16 which reduces the current consumption to 220μA. Unlike n Input Offset Voltage Drift: 1.7μV/°C (Max), G = 16 a conventional voltage feedback amplifier, the LTC6373 n –3dB Bandwidth: 4MHz, G = 16 maintains nearly the same bandwidth across all its gain n Input Noise Density: 8nV/√Hz, G = 16 settings. n Slew Rate: 12V/μs, G = 16 The LTC6373 features fully differential outputs to drive n Adjustable Output Common Mode Voltage high performance, differential-input ADCs. The output n Quiescent Supply Current: 4.4mA common mode voltage is independently adjustable via n Supply Voltage Range: ±4.5V to ±18V the VOCM pin. The combination of high impedance inputs, n –40°C to 125°C Specified Temperature Range DC precision, low noise, low distortion, and high-speed n Small 12-Lead 4mm × 4mm DFN (LFCSP) Package differential ADC drive makes the LTC6373 an ideal candi- date for optimizing data acquisition systems.
APPLICATIONS
The LTC6373 is available in a 12-lead 4mm × 4mm DFN n Data Acquisition Systems (LFCSP) package and is fully specified over the −40°C to n Biomedical Instrumentation 125°C temperature range. n Test and Measurement Equipment All registered trademarks and trademarks are the property of their respective owners. n Differential ADC Drivers n Single-Ended-to-Differential Conversion n Multiplexed Applications
TYPICAL APPLICATION Gain vs Frequency Gain vs Frequency
36 R
Interfacing a 40V
L = 2kΩ
P-P Ground-Referenced Differential Input Signal to a 5V ADC
30 24 15V 18 10V G = 0.25 5V 5V 1.8V 12 180pF 6 V+ –10V 0V VREF VDD GAIN (dB) A2 887Ω 0 – + OUTV A1 IN+ A0 20-BIT –6 2.5V VOCM LTC6373 AD4020 887Ω SAR ADC –12 V–IN + IN– 0.6Msps DGND –18 10V 5V CAP 180pF GND –24 V– V+IN 0.01 0.1 1 10 100 FREQUENCY (MHz) 6373 TA01b –10V –15V 0V MEASURED SIGNAL CHAIN PERFORMANCE: INPUT: fIN =1kHz, –0.5dBFS G = 16 G = 2 G = 0.5 180pF SNR: 96.5dB G = 8 G = 1 G = 0.25 THD: –122dB 6373 TA01a G = 4 Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Applications Information Package Description Typical Application Related Parts