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LTC2355IMSE-14 Datasheet(PDF) 11 Page - Linear Technology

Part # LTC2355IMSE-14
Description  Serial 12-Bit/14-Bit, 3.5Msps Sampling ADCs with Shutdown
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2355IMSE-14 Datasheet(HTML) 11 Page - Linear Technology

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LTC2355-12/LTC2355-14
2355f
INPUT SPAN VERSUS REFERENCE VOLTAGE
The differential input range has a 0V to VREF unipolar
voltage span that equals the difference between the volt-
age at the reference buffer output VREF at Pin 3, and the
voltage at the ground (Exposed Pad Ground). The differ-
ential input range of the ADC is 0V to 2.5V when using the
internal reference. The internal ADC is referenced to these
two nodes. This relationship also holds true with an
external reference.
DIFFERENTIAL INPUTS
The LTC2355-12/LTC2355-14 has a unique differential
sample-and-hold circuit that measures input voltages
from ground to VDD. The ADC will always convert the
unipolar difference of AIN+ – AIN–, independent of the
common mode voltage at the inputs. The common mode
rejection holds up at extremely high frequencies, see
Figure 3. The only requirement is that both inputs not go
below ground or exceed VDD. Integral nonlinearity errors
(INL) and differential nonlinearity errors (DNL) are largely
independent of the common mode voltage. However, the
offset error will vary. The change in offset error is typically
less than 0.1% of the common mode voltage.
Figure 4 shows the ideal input/output characteristics for
the LTC2355-12/LTC2355-14. The code transitions occur
midway between successive integer LSB values (i.e.,
0.5LSB, 1.5LSB, 2.5LSB, FS – 1.5LSB). The output code
is straight binary with 1LSB = 2.5V/16384 = 153
µV for the
LTC2355-14, and 1LSB = 2.5V/4096 = 610
µV for the
LTC2355-12. The LTC2355-14 has 1LSB RMS of random
white noise.
Figure 3. CMRR vs Frequency
Figure 4. LTC2355-12/LTC2355-14 Transfer Characteristic
APPLICATIO S I FOR ATIO
FREQUENCY (Hz)
100
0
–20
–40
–60
–80
–100
–120
1k
10k
100k
1M
2355 F03
10M
100M
INPUT VOLTAGE (V)
2355 F05
111...111
111...110
111...101
000...000
000...001
000...010
FS – 1LSB
0


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