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| 型號(hào)： | AD9225-EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Complete 12-Bit, 25 MSPS Monolithic A/D Converter |
| 中文描述： | 完整的12位，25 MSPS的單片機(jī)的A / D轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 11/24頁(yè) |
| 文件大小： | 321K |
| 代理商： | AD9225-EB |
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AD9225
–11–
REV. A
Table I. Analog Input Configuration Summary
Input
Connection
Input
Input Range (V)
VINA
1
Figure
#
Coupling Span (V)
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
2
×
VREF
VREF
19, 20
Same as above but with improved noise performance due to
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
to
2.0 + VREF
2.0
30
Optimum THD performance with VREF = 1. Single supply
operation (i.e., +5 V) for many op amps.
Single-Ended
AC
2 or
2
×
VREF
0 to 1 or
0 to 2
×
VREF
1 or VREF
21, 22
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
to
2.0 + VREF
2.0
21
Flexible input range, optimum THD performance with VREF = 1.
Ability to use either +5 V or
±
5 V op amp.
Differential
(via Transformer)
or Amplifier
AC/DC
2
2 to 3
3 to 2
23, 24
Optimum full-scale THD and SFDR performance well beyond
the A/Ds Nyquist frequency. Preferred mode for undersampling
applications.
2
×
VREF
2.0 – VREF/2
to
2.0 + VREF/2
2.0 + VREF/2
to
2.0 – VREF/2
23, 24
Same as above with the exception that full-scale THD and SFDR
performance can be traded off for better noise performance.
4.0
2.0 to 3.0
3.0 to 2.0
23, 24
Optimum noise performance.
NOTE
1
VINA and VINB can be interchanged if signal inversion is required.
Table II. Reference Configuration Summary
Reference
Operating Mode
INTERNAL
INTERNAL
INTERNAL
Input Span (VINA–VINB)
(V p-p)
2
4
2
≤
SPAN
≤
4 AND
SPAN = 2
×
VREF
Required VREF (V)
1
2
1
≤
VREF
≤
2.0 AND
VREF = (1 + R1/R2)
Connect
SENSE
SENSE
R1
R2
To
VREF
REFCOM
VREF AND SENSE
SENSE AND REFCOM
EXTERNAL
(NONDYNAMIC)
2
≤
SPAN
≤
4
1
≤
VREF
≤
2.0
SENSE
VREF
AVDD
EXT. REF.
EXTERNAL
(DYNAMIC)
2
≤
SPAN
≤
4
CAPT and CAPB
Externally Driven
SENSE
VREF
EXT. REF.
EXT. REF.
AVDD
AVSS
CAPT
CAPB
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