LTC1043 Dual Precision Instrumentation Switched Capacitor Building Block UFEATURESDESCRIPTIO ■ Instrumentation Front End with 120dB CMRR The LTC®1043 is a monolithic, charge-balanced, dual ■ Precise, Charge-Balanced Switching switched capacitor instrumentation building block. A pair ■ Operates from 3V to 18V of switches alternately connects an external capacitor to ■ Internal or External Clock an input voltage and then connects the charged capacitor ■ Operates up to 5MHz Clock Rate across an output port. The internal switches have a ■ Low Power break-before-make action. An internal clock is provided ■ Two Independent Sections with One Clock and its frequency can be adjusted with an external capacitor. The LTC1043 can also be driven with an external U CMOS clock. APPLICATIO S The LTC1043, when used with low clock frequencies, ■ Precision Instrumentation Amplifiers provides ultra precision DC functions without requiring ■ Ultra Precision Voltage Inverters, Multipliers precise external components. Such functions are and Dividers differential voltage to single-ended conversion, voltage ■ V–F and F–V Converters inversion, voltage multiplication and division by 2, 3, 4, 5, ■ Sample-and-Hold etc. The LTC1043 can also be used for precise V–F and ■ Switched Capacitor Filters F–V circuits without trimming, and it is also a building block for switched capacitor filters, oscillators and modulators. The LTC1043 is manufactured using Linear Technology’s enhanced LTCMOSTM silicon gate process. , LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOS is a trademark of Linear Technology Corporation. UTYPICAL APPLICATIOInstrumentation AmplifierCMRR vs Frequency 5V 140 C 4 S = CH = 1µF 5V 120 3 8 7 8 + 1µF 1 1/2 LTC1013 VOUT 100 CH 2 – 11 4 80 DIFFERENTIAL 1µF –5V CS CMRR (dB) INPUT (EXTERNAL) 60 12 1µF 40 13 14 20 R1 R2 100 1k 10k 100k FREQUENCY OF COMMON MODE SIGNAL 16 1/2 LTC1043 CMRR > 120dB AT DC LTC1043 • TA02 CMRR > 120dB AT 60Hz 0.01µF DUAL SUPPLY OR SINGLE 5V GAIN = 1 + R2/R1 17 LTC1043 • TA01 VOS ≈ 150µV –5V ∆VOS ≈ 2µV/°C ∆T COMMON MODE INPUT VOLTAGE INCLUDES THE SUPPLIES 1043fa 1
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