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ADS5271 Datasheet(PDF) 32 Page - Texas Instruments

Part # ADS5271
Description  10-Bit, Octal-Channel ADC Up to 65MSPS
PDF  42 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

ADS5271 Datasheet(HTML) 32 Page - Texas Instruments

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CMBuffer
Internal
Voltage
Reference
Input
Circuitry
IN
P
IN
N
V
CM
1.2kW
1.2kW
ADS5287
(2mA)
f
´ S
50MSPS
5nHto9nH(TQFP-80)
2nHto3nH(QFN-64)
1.5pF
to2.4pF
IN
OUT
IN
P
1.5pFto
2.5pF
1W
1000W
to1440W
5W
to10W
1000W
to1440W
5nHto9nH(TQFP-80)
2nHto3nH(QFN-64)
IN
N
1.5pFto
2.5pF
1W
15W
to25W
15W
to30W
0.2pF
to0.3pF
IN
OUT
1.5pF
to2.4pF
IN
OUT
5W
to10W
15W
to25W
15W
to30W
IN
OUT
IN
OUT
16
to32
W
W
IN
OUT
IN
OUT
OUT
P
OUT
N
SwitchesthatareON
inSAMPLEphase.
SwitchesthatareON
inHOLDphase.
ADS5287
SBAS428D – JANUARY 2008 – REVISED JUNE 2012
www.ti.com
Figure 31. Analog Input Circuit Model
during ac-coupling by increasing VCM by roughly
Input Common-Mode Current
75mV.
When
operating
above
50MSPS,
it
is
recommended that additional parallel resistors be
The input stage of all eight ADCs together sinks a
added externally to restore the input common-mode
common-mode current on the order of 2mA at
to at least 1.4V, if the inputs are to be ac-coupled.
50MSPS. Equation 3 describes the dependency of
the
common-mode
current
and
the
sampling
frequency.
(3)
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 32.
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 32. 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.
Initialization Registers 1 and 5, described in the
Initialization Register table, can be used to partially
reduce the effect of this input common-mode drop
32
Copyright © 2008–2012, Texas Instruments Incorporated



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