LTC6943 查看數據表（PDF） - Linear Technology

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LTC6943

Micropower, Dual Precision Instrumentation Switched Capacitor Building Block

Linear Technology 

LTC6943

TYPICAL PERFOR A CE CHARACTERISTICS (Test Circuits 2 through 4)

Oscillator Frequency, fOSC

vs Ambient Temperature

350

COSC = 0pF

300

VS = 5V

250

200 VS = 10V

150 VS = 15V

100

50

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

6943 TPC10

COSC Pin ISINK, ISOURCE

vs Supply Voltage

100

ISINK, TA = –55°C

75

ISINK, TA = 25°C

ISOURCE, TA = –55°C

50

ISOURCE, TA = 25°C

25

ISINK, TA = 125°C

ISOURCE, TA = 125°C

0

0 2 4 6 8 10 12 14 16 18

LTC1043 • TPC11

Break-Before-Make Time, tNOV,

vs Supply Voltage

80

TA = 25°C

70

60

50

40

30

20

10

0 2 4 6 8 10 12 14 16 18 20

VSUPPLY (V)

LTC1043 • TPC12

BLOCK DIAGRA

S1A 6

SHA 8

9 CA+

10 CA–

7 S2A

4

S3A 11

S1B 5

CHARGE

BALANCING

CIRCUITRY

12 S4A

4 S2B

S3B 16

1 CB+

2 CB–

CHARGE

BALANCING

CIRCUITRY

13 S4B

V+

COSC 14

V–

NON-OVERLAPPING

CLOCK

OSCILLATOR

3 V+

15 V–

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

THE SWITCHES ARE TIMED AS SHOWN WITH PIN 14 HIGH

6943 • BD01

6943f

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