LTC6943_15 datasheet(5/16 Pages) LINER

Part #	LTC6943

Description	Micropower, Dual Precision Instrumentation Switched Capacitor Building Block

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Manufacturer	LINER [Linear Technology]

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LTC6943

5

6943f

Test Circuit 1. Leakage Current Test

Common Mode Rejection Ratio (CMRR)

The LTC6943, when used as a differential to single-ended

converter rejects common mode signals and preserves

differential voltages (Figure 1). Unlike other techniques,

the LTC6943’s CMRR does not degrade with increasing

common mode voltage frequency. During the sampling

mode, the impedance of Pins 1, 2 (and 9, 10) should be

balanced, otherwise, common mode signals will appear

differentially. The value of the CMRR depends on the value

of the sampling and holding capacitors (CS, CH) and on the

sampling frequency. Since the common mode voltages

are not sampled, the common mode signal frequency can

well exceed the sampling frequency without experiencing

aliasing phenomena. The CMRR of Figure 1 is measured

by shorting Pins 6 and 11 and by observing, with a

TEST CIRCUITS

Test Circuit 2. RON Test

Test Circuit 3. Oscillator Frequency, fOSC

Test Circuit 4. CMRR Test

6943 • TC04

CMRR = 20 LOG

()

FOR OPTIMUM CMRR, THE COSC SHOULD

BE LARGER THAN 0.0047µF, AND

THE SAMPLING CAPACITOR ACROSS

PINS 9 AND 10 SHOULD BE PLACED

OVER A SHIELD TIED TO PIN 8

+

V– ≤ VCM ≤ V

+

VCM

VOUT

11

12

10

9

8

67

1µF

CAPACITORS ARE

NOT ELECTROLYTIC

NOTE:

APPLICATIO S I FOR ATIO

Figure 1. Differential to Single-Ended Converter

6943 • TC01

(6, 11, 5, 16)

(7, 12, 4, 13)

(9, 10, 1, 2)

NOTE: TO OPEN SWITCHES,

S1 AND S3 PIN 14,

SHOULD BE CONNECTED

TO V–. TO OPEN S2, S4, THE

COSC PIN 14 SHOULD BE

CONNECTED TO V+ COSC

+

A

0V TO 10V

6943 • AI01

CS, CH ARE MYLAR OR POLYPROPYLENE

+

CH

CS

C–

C+

VD

11

12

10

9

1/2 LTC6943

67

VD

VCM

+

V+

6943 • TC03

3

V–

14

(TEST PIN)

IV

4

LTC6943

15

COSC

1

+

5

6943 • TC02

(6, 11, 5, 16)

(7, 12, 4, 13)

(9, 10, 1, 2)

100µA to 1mA

CURRENT SOURCE

+

A

VIN

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