LTC2383CMS-16PBF datasheet(11/24 Pages) LINER

Part #	LTC2383CMS-16PBF

Description	16-Bit, 1Msps, Low Power SAR ADC with Serial Interface

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Manufacturer	LINER [Linear Technology]

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LTC2383-16

11

238316f

APPLICATIONS INFORMATION

time is important even for DC inputs, because the ADC

inputs draw a current spike when entering acquisition.

For best performance, a buffer amplifier should be used to

drive the analog inputs of the LTC2383-16. The amplifier

provides low output impedance, which produces fast

settling of the analog signal during the acquisition phase.

It also provides isolation between the signal source and

the current spike the ADC inputs draw.

Input Filtering

The noise and distortion of the buffer amplifier and signal

source must be considered since they add to the ADC noise

and distortion. Noisy input signals should be filtered prior

to the buffer amplifier input with an appropriate filter to

minimize noise. The simple 1-pole RC lowpass filter (LPF1)

shown in Figure 4 is sufficient for many applications.

AnotherfilternetworkconsistingofLPF2andthe100Ωseries

input resistors should be used between the buffer and ADC

inputs to both minimize the noise contribution of the buffer

and to help minimize disturbances reflected into the buffer

from sampling transients. Long RC time constants at the

analoginputswillslowdownthesettlingoftheanaloginputs.

Therefore, LPF2 requires a wider bandwidth than LPF1. A

buffer amplifier with a low noise density must be selected to

minimize degradation of the SNR. With the 482kHz lowpass

filter shown in Figure 4, the LT6350 provides the full data

sheet performance of the LTC2383-16.

High quality capacitors and resistors should be used in the

RC filters since these components can add distortion. NPO

and silver mica type dielectric capacitors have excellent

linearity. Carbon surface mount resistors can generate

distortion from self heating and from damage that may

occur during soldering. Metal film surface mount resistors

are much less susceptible to both problems.

50Ω

3300pF

6600pF

50Ω

500Ω

100Ω

LPF2

LPF1

BW = 482kHz

BW = 48kHz

SINGLE-ENDED-

TO-DIFFERENTIAL

DRIVER

SINGLE-ENDED-

INPUT SIGNAL

LTC2383-16

IN+

IN–

238316 F04

LT6350

Single-Ended-to-Differential Conversion

For single-ended input signals, a single-ended to differential

conversion circuit must be used to produce a differential

signal at the inputs of the LTC2383-16. The LT6350 ADC

driver is recommended for performing single-ended-to-

differential conversions.The LT6350 is flexible and may

be configured to convert single-ended signals of various

amplitudes to the ±2.5V differential input range of the

LTC2383-16. The LT6350 is also available in H-grade to

complement the extended temperature operation of the

LTC2383-16 up to 125°C.

Figure 5 shows the LT6350 being used to convert a 0V

to 2.5V single-ended input signal. In this case, the first

amplifier is configured as a unity gain buffer and the single-

ended input signal directly drives the high-impedance

input of the amplifier. As shown in the FFT of Figure 5a,

the LT6350 drives the LTC2383-16 to full datasheet

performance without degrading the SNR or THD .

Figure 4. Input Signal Chain

LT6350

VCM = VREF/2

2.5V to

0V

0V to

2.5V

0V to 2.5V

238316 F05

OUT1

RINT

OUT2

8

4

5

2

1

+

–

+

–

+

FREQUENCY (kHz)

0

100

200

300

400

500

–180

–60

–40

–20

–80

–100

–120

–140

–160

0

238316 F05a

SNR = 92.2dB

THD = –106.2dB

SINAD = 92dB

SFDR = 110.4dB

Figure 5. LT6350 Converting a 0V-2.5V Single-Ended Signal

to a ±2.5V Differential Input Signal

Figure 5a. 32k Point FFT Plot for Circuit Shown in Figure 5

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LTC2383CMS-16PBF Datasheet(PDF) 11 Page - Linear Technology

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