LTC1043 Dual Precision Instrumentation Switched Capacitor Building Block FEATURES DESCRIPTIO 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 VF and FV Converters inversion, voltage multiplication and division by 2, 3, 4, 5, Sample-and-Hold etc. The LTC1043 can also be used for precise VF and Switched Capacitor Filters FV circuits without trimming, and it is also a building block for switched capacitor filters, oscillators and modulators. The LTC1043 is manufactured using Linear Technologys TM enhanced LTCMOS silicon gate process. , LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOS is a trademark of Linear Technology Corporation. TYPICAL APPLICATIO Instrumentation Amplifier CMRR vs Frequency 5V 140 C = C = 1F 4 S H 5V 120 8 3 7 8 + 1 1F 1/2 LTC1013 V 100 OUT C H 2 11 4 80 DIFFERENTIAL 1F 5V C S INPUT (EXTERNAL) 60 12 1F 40 13 14 20 R1 R2 100 1k 10k 100k FREQUENCY OF COMMON MODE SIGNAL CMRR > 120dB AT DC 16 1/2 LTC1043 LTC1043 TA02 CMRR > 120dB AT 60Hz 0.01F DUAL SUPPLY OR SINGLE 5V GAIN = 1 + R2/R1 17 LTC1043 TA01 V 150V OS 5V V OS 2V/C T COMMON MODE INPUT VOLTAGE INCLUDES THE SUPPLIES 1043fa 1 CMRR (dB) U ULTC1043 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW ORDER PART Supply Voltage ........................................................ 18V 1 18 S3B SH NUMBER + B Input Voltage at Any Pin .......... 0.3V V V + 0.3V IN + 2 17 V C B Operating Temperature Range LTC1043CN 3 16 C C B OSC LTC1043C ................................... 40C T 85C LTC1043CSW A + 4 15 S4B V LTC1043M (OBSOLETE).............55C T 125C A 5 14 S4A S2B Storage Temperature Range ................. 65C to 150C 6 13 S3A S1B Lead Temperature (Soldering, 10 sec).................. 300C 7 12 C S1A A + 8 11 C S2A A 9 10 SH NC A N PACKAGE SW PACKAGE 18-LEAD PDIP 18-LEAD PLASTIC SO T = 100C, = 100C/W PACKAGE (N) JMAX JA T = 150C, = 85C/W PACKAGE (SW) JMAX JA D PACKAGE LTC1043MD 18-LEAD SIDE BRAZED (HERMETIC) OBSOLETE PACKAGE Consider the N18 Package as an Alternate Source LTC1043 POI01 Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating temperature + range, otherwise specifications are at T = 25C. V = 10V, V = 0V, LTC1043M operates from 55C T 125C LTC1043C operates from A A 40C T 85C, unless otherwise noted. A LTC1043M LTC1043C SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS I Power Supply Current Pin 16 Connected High or Low 0.25 0.4 0.25 0.4 mA S 0.7 0.7 mA C (Pin 16 to V ) = 100pF 0.4 0.65 0.4 0.65 mA OSC 11mA I OFF Leakage Current Any Switch, Test Circuit 1 (Note 2) 6 100 6 100 pA I 6 500 6 nA R ON Resistance Test Circuit 2, V = 7V, 1 = 0.5mA 240 400 240 400 ON IN + V = 10V, V = 0V 700 700 R ON Resistance Test Circuit 2, V = 3.1V, 1 = 0.5mA 400 700 400 700 ON IN + V = 5V, V = 0V 11k f Internal Oscillator Frequency C (Pin 16 to V ) = 0pF 185 185 kHz OSC OSC C (Pin 16 to V ) = 100pF 20 34 50 20 34 50 kHz OSC Test Circuit 3 15 75 15 75 kHz + I Pin Source or Sink Current Pin 16 at V or V 40 70 40 70 A OSC 100 100 A Break-Before-Make Time 25 25 ns Clock to Switching Delay C Pin Externally Driven 75 75 ns OSC f Max External CLK Frequency C Pin Externally Driven with CMOS Levels 5 5 MHz M OSC + CMRR Common Mode Rejection Ratio V = 5V, V = 5V, 5V < V < 5V 120 120 dB CM DC to 400Hz Note 1: Absolute Maximum Ratings are those values beyond which the life Note 2: OFF leakage current is guaranteed but not tested at 25C. of a device may be impaired. 1043fa 2 U WWW