LTC1043 WUTYPICAL PERFOR A CE CHARACTERISTICS (Test Circuits 2 through 4)Oscillator Frequency, fOSCCBreak-Before-Make Time, tOSC Pin ISINK, ISOURCENOV,vs Ambient Temperature, TAvs Supply Voltagevs Supply Voltage 350 100 80 COSC = 0pF TA = 25°C 325 A) µ ISINK, TA = –55°C 70 300 75 275 60 ISINK, TA = 25°C 250 ISOURCE, TA = –55°C 50 (kHz) 225 50 (ns) ISOURCE, TA = 25°C f OSC 200 t NOV 40 175 V+ = 10V, V– = 0V 30 25 150 ISINK, TA = 125°C V+ = 5V, V– = 0V 20 125 PIN 16 SOURCE OR SINK CURRENT ( V+ ISOURCE, TA = 125°C = 15V, V– = 0V 100 0 10 –50 –25 0 25 50 75 100 125 0 2 4 6 8 10 12 14 16 18 0 2 4 6 8 10 12 14 16 18 20 AMBIENT TEMPERATURE (°C) VSUPPLY (V) LTC1043 • TPC10 LTC1043 • TPC11 LTC1043 • TPC12 WBLOCK DIAGRA S1A S2A 7 8 10 11 C + SHA A 12 C – A S3A S4A 13 14 CHARGE BALANCING CIRCUITRY S1B S2B 6 5 1 2 C + SHB B 3 C – B S3B S4B 18 15 CHARGE BALANCING CIRCUITRY THE CHARGE BALANCING CIRCUITRY SAMPLES THE VOLTAGE V+ AT S3 WITH RESPECT TO S4 (PIN 16 HIGH) AND INJECTS A NON-OVERLAPPING SMALL CHARGE AT THE C+ PIN (PIN 16 LOW). 4 CLOCK THIS BOOSTS THE CMRR WHEN THE LTC1043 IS USED AS AN INSTRUMENTATION AMPLIFIER FRONT END. V+ COSC V– FOR MINIMUM CHARGE INJECTION IN OTHER TYPES OF 16 OSCILLATOR 17 APPLICATIONS, S3A AND S3B SHOULD BE GROUNDED V– THE SWITCHES ARE TIMED AS SHOWN WITH PIN 16 HIGH LTC1043 • BD01 1043fa 4
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