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LTC2321-14 数据表(PDF) 15 Page - Linear Technology

部件名 LTC2321-14
功能描述  Dual, 16-Bit, 2Msps Differential Input ADC with Wide Input Common Mode Range
Download  26 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC2321-14 数据表(HTML) 15 Page - Linear Technology

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LTC2321-16
15
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.
25
25
220pF
VREF
0V
VREF
0V
VREF
0V
VREF
0V
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
0
Figure 10. Fully-Differential Application Circuit
Figure 11. Fully-Differential Transfer Function


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