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LTC6373

LTC6373
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LTC6373 36V Fully-Differential Programmable-Gain Instrumentation Amplifier with 25pA Input Bias Current FEATURES Pin-Programmable Gains: G = 0.25, 0.5, 1, 2, 4, 8, 16V/V + Shutdown n Fully Differential Outputs n Gain Error: 0.012% (Max) n Gain Error Drift: 1ppm/°C (Max) n CMRR: 103dB (Min), G = 16 n Input Bias Current: 25pA (Max) n Input Offset Voltage: 92μV (Max), G = 16 n Input Offset Voltage Drift: 1.7μV/°C (Max), G = 16 n –3dB Bandwidth: 4MHz, G = 16 n Input Noise Density: 8nV/√Hz, G = 16 n Slew Rate: 12V/μs, G = 16 n Adjustable Output Common Mode Voltage n Quiescent Supply Current: 4.4mA n Supply Voltage Range: ±4.5V to ±18V n –40°C to 125°C Specified Temperature Range n Small 12-Lead 4mm × 4mm DFN (LFCSP) Package The LTC®6373 is a precision instrumentation amplifier with fully differential outputs which includes a closelymatched internal resistor network to achieve excellent CMRR, offset voltage, gain error, gain drift, and gain nonlinearity. The user can easily program the gain to one of seven available settings through a 3-bit parallel interface (A2 to A0). The 8th state puts the part in shutdown which reduces the current consumption to 220μA. Unlike a conventional voltage feedback amplifier, the LTC6373 maintains nearly the same bandwidth across all its gain settings. The LTC6373 features fully differential outputs to drive high performance, differential-input ADCs. The output common mode voltage is independently adjustable via the VOCM pin. The combination of high impedance inputs, DC precision, low noise, low distortion, and high-speed differential ADC drive makes the LTC6373 an ideal candidate for optimizing data acquisition systems. The LTC6373 is available in a 12-lead 4mm × 4mm DFN (LFCSP) package and is fully specified over the −40°C to 125°C temperature range. Data Acquisition Systems n Biomedical Instrumentation n Test and Measurement Equipment n Differential ADC Drivers n Single-Ended-to-Differential Conversion n Multiplexed Applications n All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION Gain vs Frequency Gain vs Frequency 36 Interfacing a 40VP-P Ground-Referenced Differential Input Signal to a 5V ADC 10V MEASURED SIGNAL CHAIN PERFORMANCE: INPUT: fIN =1kHz, –0.5dBFS SNR: 96.5dB 6373 TA01a THD: –122dB

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LTC6373 ABSOLUTE MAXIMUM RATINGS DFM PACKAGE 12-LEAD (4mm × 4mm) PLASTIC DFN TJMAX = 150°C, θJA = 43°C/W, θJC = 3.4°C/W EXPOSED PAD (PIN 13) IS V–, MUST BE SOLDERED TO PCB ORDER INFORMATION TUBE PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE 12-Lead (4mm × 4mm) Plastic DFN, Side Solderable –40°C to 85°C 12-Lead (4mm × 4mm) Plastic DFN, Side Solderable –40°C to 125°C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500...

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The l denotes the specifications which apply over the full operating temperature range, otherwise specifications and all typical values are at TA = 25°C. V+ = V+OUT = 15V, V– = –15V, VICM = VOCM = DGND = 0V, G = 1 (A2 = 5V, A1 = A0 = 0V). VS is defined as (V+ – V–). VICM is defined as (V+IN + V–IN)/2. VOUTCM is defined as (V+OUT + V–OUT)/2. VOUTDIFF is defined as (V+OUT – V–OUT). SYMBOL Differential Gain Range Differential Gain Error (Note 11) Differential Gain Nonlinearity (Note 11) Differential Offset Voltage (Input Referred) (Note 7) Differential Offset Voltage Drift (Input Referred)...

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The l denotes the specifications which apply over the full operating temperature range, otherwise specifications and all typical values are at TA = 25°C. V+ = V+OUT = 15V, V– = –15V, VICM = VOCM = DGND = 0V, G = 1 (A2 = 5V, A1 = A0 = 0V). VS is defined as (V+ – V–). VICM is defined as (V+IN + V–IN)/2. VOUTCM is defined as (V+OUT + V–OUT)/2. VOUTDIFF is defined as (V+OUT – V–OUT). SYMBOL Input Common Mode Rejection Ratio (Input Referred) ∆VICM/∆VOSDIFF DC to 60Hz, 1kΩ Source Imbalance, VICM = ±10V G = 16 G = 16 Output Common Mode Rejection Ratio (Input Referred) ∆VOCM/∆VOSDIFF Differential...

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The l denotes the specifications which apply over the full operating temperature range, otherwise specifications and all typical values are at TA = 25°C. V+ = V+OUT = 15V, V– = –15V, VICM = VOCM = DGND = 0V, G = 1 (A2 = 5V, A1 = A0 = 0V). VS is defined as (V+ – V–). VICM is defined as (V+IN + V–IN)/2. VOUTCM is defined as (V+OUT + V–OUT)/2. VOUTDIFF is defined as (V+OUT – V–OUT). SYMBOL Voltage Range for the VOCM Pin (Guaranteed by ∆GCM) Self-Biased Voltage at the VOCM Pin Input Resistance, VOCM Pin Voltage Range for the DGND Pin Digital Input (A2/A1/A0) Logic Low Digital Input (A2/A1/A0)...

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LTC6373 ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC6373 is capable of producing peak output currents in excess of 40mA. Current density limitations within the IC require the continuous RMS current supplied by the output (sourcing or sinking) over the operating lifetime of the part be limited to under 40mA (Absolute Maximum). Note 3: A heat sink may be required to keep...

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LTC6373 TYPICAL PERFORMANCE CHARACTERISTICS V+ = V+OUT = 15V, V– = –15V, VICM = VOCM = 0V, TA = 25°C, G = 1, unless otherwise noted. Typical Distribution of Differential Typical Distribution of Differential RTI Offset Voltage RTI Offset Voltage Typical Distribution of Differential Typical Distribution of Differential RTI Offset Voltage RTI Offset Voltage 35 Typical Distribution of Differential RTI Offset Voltage G = 16 TA = –40°C to 85°C 97 UNITS PERCENTAGE OF UNITS (%) Typical Distribution of Differential RTI Offset Voltage Drift Typical Distribution of CMRR Typical Distribution of CMRR 25...

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