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AD9225ARZ Arkusz danych(PDF) 11 Page - Analog Devices

Numer części AD9225ARZ
Szczegółowy opis  Complete 12-Bit, 25 MSPS Monolithic A/D Converter
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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AD9225
–11–
Table I. Analog Input Configuration Summary
Input
Input
Input Range (V)
Figure
Connection
Coupling
Span (V)
VINA
*
VINB
*
No.
Comments
Single-Ended
DC
2
0 to 2
1
8, 9
Best for stepped input response applications;
requires
±5 V op amp.
2
¥ VREF 0 to
VREF
8, 9
Same as above but with improved noise
2
¥ VREF
performance due to increase in dynamic
range. Headroom/settling time requirements
of
±5 V op amp should be evaluated.
40 to 4
2.0
8, 9
Optimum noise performance, excellent THD
performance, often requires low distortion op
amp with VCC > +5 V due to its headroom
issues.
2
¥ VREF 2.0 – VREF
2.0
21
Optimum THD performance with VREF = 1.
to
Single-supply operation (i.e., +5 V) for many
2.0 + VREF
op amps.
Single-Ended
AC
2 or
0 to 1 or
1 or VREF
10, 11
2
¥ VREF 0 to 2 ¥ VREF
4
0.5 to 4.5
2.0
11
Optimum noise performance, excellent THD
performance; ability to use
±5 V op amp.
2
¥ VREF 2.0 – VREF
2.0
10
Flexible input range, optimum THD perfor-
to
mance with VREF = 1. Ability to use either
2.0 + VREF
+5 V or
±5 V op amp.
Differential
AC/DC
2
2 to 3
3 to 2
12, 13
Optimum full-scale THD and SFDR perfor-
(via Transformer)
mance well beyond the ADC’s Nyquist
or Amplifier
frequency. Preferred mode for under-
sampling applications.
2
¥ VREF 2.0 – VREF/2 2.0 + VREF/2 12, 13 Same as above with the exception that full-
to
to
scale THD and SFDR performance can be
2.0 + VREF/2
2.0 – VREF/2
traded off for better noise performance.
4.0
1.5 to 3.5
3.5 to 1.5
12, 13
Optimum noise performance.
*VINA 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
External Reference
External
2
£ SPAN £ 4
CAPT and CAPB
SENSE
AVDD
(Dynamic)
Externally Driven
VREF
AVSS
External Reference
CAPT
External Reference
CAPB
Rev. C


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