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LTC2321-16

232116fc

For more information www.linear.com/LTC2321-16

applicaTions inForMaTion

may be useful if single-supply analog input drivers are

used which cannot swing rail-to-rail. The fully-differential

configuration is illustrated in Figure 10, with the corre-

sponding transfer function illustrated in Figure 11.

INPUT DRIVE CIRCUITS

A low impedance source can directly drive the high imped-

ance inputs of the LTC2321-16 without gain error. A high

impedance source should be buffered to minimize set-

tling time during acquisition and to optimize the distortion

performance of the ADC. Minimizing settling time is

important even for DC inputs, because the ADC inputs

draw a current spike when during acquisition.

For best performance, a buffer amplifier should be used to

drive the analog inputs of the LTC2321-16. 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.

220pF

VREF

ONLY CHANNEL 1 SHOWN FOR CLARITY

–

LTC2321-16

LT1819

232116 F10

SDO1

VBYP1

REFOUT1

CLKOUT

AIN1–

AIN1+

SCK

TO CONTROL

LOGIC

(FPGA, CPLD,

DSP, ETC.)

1µF

10µF

232116 F11

–VREF

–16384

16383

–32768

32767

VREF

AIN

(AINn+ – AINn–)

ADC CODE

(2’s COMPLEMENT)

–VREF/2

VREF/2

Figure 10. Fully-Differential Application Circuit

Figure 11. Fully-Differential Transfer Function

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