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LTC2348-16 Datasheet(PDF) 20 Page - Linear Technology

Part No. LTC2348-16
Description  Octal, 16-Bit, 200ksps Differential ±10.24V Input SoftSpan ADC with Wide Input Common Mode Range
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC2348-16 Datasheet(HTML) 20 Page - Linear Technology

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LTC2348-16
20
234816fa
For more information www.linear.com/LTC2348-16
INPUT VOLTAGE (V)
0V
–1
LSB
234816 F02
011...111
011...110
000...001
000...000
100...000
100...001
111...110
1
LSB
BIPOLAR
ZERO
111...111
FSR/2 – 1LSB
–FSR/2
FSR = +FS – –FS
1LSB = FSR/65536
Figure 2. LTC2348-16 Two’s Complement Transfer Function
INPUT VOLTAGE (V)
234816 F03
111...111
111...110
100...001
100...000
000...000
000...001
011...110
UNIPOLAR
ZERO
011...111
FSR – 1LSB
0V
FSR = +FS
1LSB = FSR/65536
Figure 3. LTC2348-16 Straight Binary Transfer Function
ANALOG INPUTS
Each channel of the LTC2348-16 simultaneously samples
the voltage difference (VIN+ – VIN–) between its analog
input pins over a wide common mode input range while
attenuating unwanted signals common to both input
pins by the common-mode rejection ratio (CMRR) of the
ADC. Wide common mode input range coupled with high
CMRR allows the IN+/INanalog inputs to swing with
an arbitrary relationship to each other, provided each
pin remains between (VCC – 4V) and VEE. This unique
feature of the LTC2348-16 enables it to accept a wide
variety of signal swings, including traditional classes of
analog input signals such as pseudo-differential unipolar,
applicaTions inForMaTion
pseudo-differential true bipolar, and fully differential,
simplifying signal chain design.
The wide operating range of the high voltage supplies
offers further input common mode flexibility. As long as
the voltage difference limits of 10V ≤ VCC – VEE ≤ 38V
are observed, VCC and VEE may be independently biased
anywhere within their own individual allowed operating
ranges, including the ability for either of the supplies to be
tied directly to ground. This feature enables the common
mode input range of the LTC2348-16 to be tailored to the
specific application’s requirements.
In all SoftSpan ranges, each channel’s analog inputs can
be modeled by the equivalent circuit shown in Figure 4.
At the start of acquisition, the 40pF sampling capacitors
(CIN) connect to the analog input pins IN+/INthrough the
samplingswitches,eachofwhichhasapproximately600Ω
(RIN)ofon-resistance.Theinitialvoltageonbothsampling
capacitorsatthestartofacquisitionisapproximatelyequal
to the sampled common-mode voltage (VIN+ + VIN–)/2
fromthepriorconversion.Theexternalcircuitryconnected
to IN+ and INmust source or sink the charge that flows
through RIN as the sampling capacitors settle from their
initial voltages to the new input pin voltages over the
course of the acquisition interval. During conversion, nap,
and power down modes, the analog inputs draw only a
small leakage current. The diodes at the inputs provide
ESD protection.
IN+
RIN
600
RIN
600
CIN
40pF
CIN
40pF
VCC
VCC
VEE
VEE
BIAS
VOLTAGE
IN
234816 F04
Figure 4. Equivalent Circuit for Differential Analog
Inputs, Single Channel Shown


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