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AD9225-EB Datenblatt(PDF) 11 Page - Analog Devices

Teilenummer AD9225-EB
Bauteilbeschribung  Complete 12-Bit, 25 MSPS Monolithic A/D Converter
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

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AD9225
–11–
REV. A
Table I. Analog Input Configuration Summary
Input
Input
Input Range (V)
Figure
Connection
Coupling Span (V)
VINA
1
VINB
1
#
Comments
Single-Ended
DC
2
0 to 2
1
19, 20
Best for stepped input response applications, requires
±5 V op amp.
2
× VREF
0 to
VREF
19, 20
Same as above but with improved noise performance due to
2
× VREF
increase in dynamic range. Headroom/settling time requirements
of
±5 op amp should be evaluated.
4
0 to 4
2.0
19, 20
Optimum noise performance, excellent THD performance, often
requires low distortion op amp with VCC > +5 V due to its head-
room issues.
2
× VREF
2.0 – VREF
2.0
30
Optimum THD performance with VREF = 1. Single supply
to
operation (i.e., +5 V) for many op amps.
2.0 + VREF
Single-Ended
AC
2 or
0 to 1 or
1 or VREF
21, 22
2
× VREF
0 to 2
× VREF
4
0.5 to 4.5
2.0
22
Optimum noise performance, excellent THD performance, ability
to use
±5 V op amp.
2
× VREF
2.0 – VREF
2.0
21
Flexible input range, optimum THD performance with VREF = 1.
to
Ability to use either +5 V or
±5 V op amp.
2.0 + VREF
Differential
AC/DC
2
2 to 3
3 to 2
23, 24
Optimum full-scale THD and SFDR performance well beyond
(via Transformer)
the A/Ds Nyquist frequency. Preferred mode for undersampling
or Amplifier
applications.
2
× VREF
2.0 – VREF/2
2.0 + VREF/2
23, 24
Same as above with the exception that full-scale THD and SFDR
to
to
performance can be traded off for better noise performance.
2.0 + VREF/2
2.0 – VREF/2
4.0
2.0 to 3.0
3.0 to 2.0
23, 24
Optimum noise performance.
NOTE
1VINA and VINB can be interchanged if signal inversion is required.
Table II. Reference Configuration Summary
Reference
Input Span (VINA–VINB)
Operating Mode
(V p-p)
Required VREF (V)
Connect
To
INTERNAL
2
1
SENSE
VREF
INTERNAL
4
2
SENSE
REFCOM
INTERNAL
2
≤ SPAN ≤ 4 AND
1
≤ VREF ≤ 2.0 AND
R1
VREF AND SENSE
SPAN = 2
× VREF
VREF = (1 + R1/R2)
R2
SENSE AND REFCOM
EXTERNAL
2
≤ SPAN ≤ 41 ≤ VREF ≤ 2.0
SENSE
AVDD
(NONDYNAMIC)
VREF
EXT. REF.
EXTERNAL
2
≤ SPAN ≤ 4
CAPT and CAPB
SENSE
AVDD
(DYNAMIC)
Externally Driven
VREF
AVSS
EXT. REF.
CAPT
EXT. REF.
CAPB


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