LTC2053IMS8 查看數據表（PDF） - Linear Technology

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LTC2053IMS8

Precision, Rail-to-Rail, Zero-Drift, Resistor-Programmable Instrumentation Amplifier

Linear Technology 

LTC2053/LTC2053-SYNC

Applications Information

If a square wave is used to drive the CLK pin, a 5µs RC

time constant should be placed in front of the CLK pin to

maintain low offset voltage performance (see Figure 2).

This avoids internal and external coupling of the high

frequency components of the external clock at the instant

the LTC2053-SYNC holds the sampled input.

5V

8

V+IN + 3 +

V–IN V–D 2 –

1

CLK

5

LTC2053-SYNC 4

7

6 R2

R1

1k EXTERNAL

CLOCK

4.7nF

5V

0V

VOUT

2053 F02

Figure 2. Centered Justified for a Single Line of Text

The LTC2053-SYNC is tested with a sample clock of 3kHz

(fCLK = 24kHz) to the same specifications as the LTC2053.

In addition, the LTC2053-SYNC is tested at one-half and

2x this frequency to verify proper operation. The curves

in the Typical Performance Characteristics section of this

data sheet apply to the LTC2053-SYNC when driving it

with a 24kHz clock at Pin 1 (fCLK = 24kHz, 3kHz sample

clock rate). Below are three curves that show the behavior

of the LTC2053-SYNC as the clock frequency is varied.

The offset is essentially unaffected over a 2:1 increase or

decrease of the typical LTC2053 sample clock speed. The

bias current is directly proportional to the clock speed.

The noise is roughly proportional to the square root of

the clock frequency. For optimum noise and bias current

performance, drive the LTC2053-SYNC with a nominal

24kHz external clock (3kHz sample clock).

20

15

VS = ±5V

10

5

0

VS = 5V

–5

VS = 3V

–10

TYP LTC2053

–15

SAMPLE FREQUENCY

–20

0

2000 4000 6000 8000 10000

SAMPLE FREQUENCY (Hz) (= FCLK/8)

2053 F03

Figure 3. LTC2053-SYNC Input

Offset vs Sample Frequency

14 VS = 5V

12

VREF = 0

VCM = 1V

10

8

6

4

TYP LTC2053

2

SAMPLE FREQUENCY

0

0 2000 4000 6000 8000 10000

SAMPLE FREQUENCY (Hz) (= FCLK/8)

2053 F04

Figure 4. LTC2053-SYNC Average Input

Bias Current vs Sample Frequency

12

VS = 5V

TA = 25°C

10

NOISE IN 10Hz BANDWIDTH

8

TYP LTC2053

SAMPLE FREQUENCY

6

4

2

0

0 2000 4000 6000 8000 10000

SAMPLE FREQUENCY (FCLK/8)

2053 F05

Figure 5. LTC2053-SYNC Input Referred

Noise vs Sample Frequency

12

2053syncfc

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