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LTC2311-16

231116fa

For more information www.linear.com/LTC2311-16

APPLICATIONS INFORMATION

cannotswingrail-to-rail.Thefully-differentialconfiguration

is illustrated in Figure 10, with the corresponding transfer

function illustrated in Figure 11.

INPUT DRIVE CIRCUITS

A low impedance source can directly drive the high im-

pedance inputs of the LTC2311-16 without gain error. A

high impedance source should be buffered to minimize

settling time during acquisition and to optimize the dis-

tortion performance of the ADC. Minimizing settling time

is important even for DC inputs, because the ADC inputs

draw a current spike at the start of the acquisition phase.

For best performance, a buffer amplifier should be used to

drive the analog inputs of the LTC2311-16. The amplifier

provides low output impedance to minimize gain error

and allow for fast settling of the analog signal during the

acquisition phase. It also provides isolation between the

signal source and the ADC inputs, which draw a small

current spike during acquisition.

Figure 10. Fully-Differential Application Circuit

Figure 11. Fully-Differential Transfer Function

47pF

VREF

–

LTC2311-16

LT1819

231116 F10

SDO

REFIN

REFOUT

SCK

AIN–

AIN+

CNV

TO CONTROL

LOGIC

(FPGA, CPLD,

DSP, ETC.)

10µF

231116 F11

–VREF

–16385

16384

–32768

32767

VREF

AIN

(AIN+ – AIN–)

ADC CODE

(2’s COMPLEMENT)

–VREF/2

VREF/2

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