LTC6943IGN datasheet(4/16 Pages) LINER

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LTC6943

6943f

Oscillator Frequency, fOSC

vs Ambient Temperature

(Test Circuits 2 through 4)

TYPICAL PERFOR A CE CHARACTERISTICS

Break-Before-Make Time, tNOV,

vs Supply Voltage

COSC Pin ISINK, ISOURCE

vs Supply Voltage

100

246

LTC1043 • TPC11

ISINK, TA = 25°C

ISOURCE, TA = –55°C

ISOURCE, TA = 25°C

ISINK, TA = 125°C

ISOURCE, TA = 125°C

ISINK, TA = –55°C

VSUPPLY (V)

LTC1043 • TPC12

18 20

TA = 25°C

BLOCK DIAGRA

6943 • BD01

–

V+

THE SWITCHES ARE TIMED AS SHOWN WITH PIN 14 HIGH

THE CHARGE BALANCING CIRCUITRY SAMPLES THE VOLTAGE

AT S3 WITH RESPECT TO S4 (PIN 14 HIGH) AND INJECTS A

SMALL CHARGE AT THE C+ PIN (PIN 14 LOW).

THIS BOOSTS THE CMRR WHEN THE LTC6943 IS USED AS AN

INSTRUMENTATION AMPLIFIER FRONT END.

FOR MINIMUM CHARGE INJECTION IN OTHER TYPES OF

APPLICATIONS, S3A AND S3B SHOULD BE GROUNDED

V–

CHARGE

BALANCING

CIRCUITRY

NON-OVERLAPPING

CLOCK

OSCILLATOR

CHARGE

BALANCING

CIRCUITRY

–

SHA

COSC

S1A 6

S4A

S1B

S2B

S4B

V+

V–

S2A

S3B

S3A

TEMPERATURE (°C)

–50

350

300

250

200

150

100

6943 TPC10

–25

100

125

VS = 5V

VS = 15V

VS = 10V

COSC = 0pF

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