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ADS5281IPFPR датащи(PDF) 31 Page - Texas Instruments

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номер детали ADS5281IPFPR
подробное описание детали  12-Bit Octal-Channel ADC Family Up to 65MSPS
PDF  41 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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ADS5281IPFPR датащи(HTML) 31 Page - Texas Instruments

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5nHto9nH(TQFP-80)
2nHto3nH(QFN-64)
1.5pF
to2.4pF
IN
OUT
IN
P
1.5pFto
2.5pF
1
W
1000
W
to1440
W
5
W
to10
W
1000
W
to1440
W
5nHto9nH(TQFP-80)
2nHto3nH(QFN-64)
IN
N
1.5pFto
2.5pF
1
W
15
W
to25
W
15
W
to30
W
0.2pF
to0.3pF
IN
OUT
1.5pF
to2.4pF
IN
OUT
5
W
to10
W
15
W
to25
W
15
W
to30
W
IN
OUT
IN
OUT
16
to32
W
W
IN
OUT
IN
OUT
OUT
P
OUT
N
SwitchesthatareON
inSAMPLEphase.
SwitchesthatareON
inHOLDphase.
Input Common-Mode Current
(2mA)
f
´
S
50MSPS
(3)
CMBuffer
Internal
Voltage
Reference
Input
Circuitry
IN
P
IN
N
V
CM
1.2k
W
1.2k
W
ADS528x
ADS5281
ADS5282
SBAS397E – DECEMBER 2006 – REVISED JANUARY 2008
Figure 34. Analog Input Circuit Model
ac-coupling by increasing VCM by roughly 75mV.
When operating above 50MSPS, it is recommended
that additional parallel resistors be added externally
The input stage of all eight ADCs together sinks a
to restore the input common-mode to at least 1.4V, if
common-mode current on the order of 2mA at
the inputs are to be ac-coupled.
50MSPS. Equation 3 describes the dependency of
the
common-mode
current
and
the
sampling
frequency.
If the driving stage is dc-coupled to the inputs, then
Equation
3
can
be
used
to
determine
its
common-mode drive capability and impedance. The
inputs can also be ac-coupled to the INN and INP
pins. In that case, the input common-mode is set by
two internal 1.2k
Ω resistors connecting the input pins
to VCM. This architecture is shown in Figure 35.
When the inputs are ac-coupled, there is a drop in
the voltages at INP and INN relative to VCM. This can
Dashed area denotes one of eight channels.
be computed from Equation 3. At 50MSPS, for
Figure 35. Common-Mode Biasing of Input Pins
example, the drop at each of the 16 input pins is
150mV, which is not optimal for ADC operation. The
initialization register 5 described in the Initialization
Registers table can be used to partially reduce the
effect of this input common-mode
drop
during
Copyright © 2006–2008, Texas Instruments Incorporated
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Product Folder Link(s): ADS5281 ADS5282



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