LTC2311-14 datasheet(20/30 Pages) LINER

Part #	LTC2311-14

Description	Quad, 16-Bit, 5Msps/Ch Simultaneous Sampling ADC

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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20 / 30 page

LTC2325-16

20

232516fa

For more information www.linear.com/LTC2325-16

APPLICATIONS INFORMATION

Input Filtering

The noise and distortion of the buffer amplifier and signal

sourcemustbeconsideredsincetheyaddtotheADCnoise

and distortion. Noisy input signals should be filtered prior

to the buffer amplifier input with a low bandwidth filter

to minimize noise. The simple 1-pole RC lowpass filter

shown in Figure 12 is sufficient for many applications.

The sampling switch on-resistance (RON) and the sample

capacitor (CIN) form a second lowpass filter that limits

the input bandwidth to the ADC core to 110MHz. A buffer

amplifier with a low noise density must be selected to

minimize the degradation of the SNR over this bandwidth.

High quality capacitors and resistors should be used in the

RCfilterssincethesecomponentscanadddistortion.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

occurduringsoldering.Metalfilmsurfacemountresistors

are much less susceptible to both problems.

25

220pF

VREF

0V

VREF

0V

VREF

0V

VREF

0V

ONLY CHANNEL 1 SHOWN FOR CLARITY

+

–

+

–

LTC2325-16

LT1819

232516 F10

SDO1

REF

REFOUT1

CLKOUT

AIN1–

AIN1+

SCK

TO CONTROL

LOGIC

(FPGA, CPLD,

DSP, ETC.)

1µF

10µF

232516 F11

–VREF

–16385

16384

–32768

32767

VREF

AIN

(AIN+ – AIN–)

ADC CODE

(2’s COMPLEMENT)

–VREF/2

VREF/2

0

Figure 10. Fully-Differential Application Circuit

Figure 11. Fully-Differential Transfer Function

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