AD9221AR Analog Devices Inc, AD9221AR Datasheet - Page 13

• Manufacturer Part Number: AD9221AR
• Description: IC ADC 12BIT 1.5MSPS 28-SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD9221AR

• Rohs Status: RoHS non-compliant
• Number Of Bits: 12
• Sampling Rate (per Second): 1.5M
• Data Interface: Parallel
• Number Of Converters: 7
• Power Dissipation (max): 70mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (0.300", 7.50mm Width)
• For Use With: AD9221-EB - BOARD EVAL FOR AD9221

Input
Connection
Single-Ended
Single-Ended
Differential
(via Transformer)
*VINA and VINB can be interchanged if signal inversion is required.
REV. E
Coupling Span (V) VINA*
DC
AC
AC
Input
2
2 × VREF 0 to
5
2 × VREF 2.5 – VREF
2 or
2 × VREF 0 to 2 × VREF
5
2 × VREF 2.5 – VREF
2
2 × VREF 2.5 – VREF/2
5
Table I. Analog Input Configuration Summary
0 to 2
2 × VREF
0 to 5
to
2.5 + VREF
0 to 1 or
0 to 5
to
2.5 + VREF
2 to 3
to
2.5 + VREF/2
1.75 to 3.25
Input Range (V)
VINB*
1
VREF
2.5
2.5
1 or VREF
2.5
2.5
3 to 2
2.5 + VREF/2 19
to
2.5 – VREF/2
3.25 to 1.75
–13–
Figure
No.
13, 14
13, 14
13, 14
24
15
15
16
19
19
Comments
Best for stepped input response applica-
tions, suboptimum THD, and noise
performance. Requires ± 5 V op amp.
Same as above but with improved noise
performance due to increase in dynamic
range. Headroom/settling time require-
ments of ± 5 V op amp should be evaluated.
Optimum noise performance, excellent
THD performance. Requires op amp with
VCC > 5 V due to headroom issue.
Optimum THD performance with VREF =
1. Noise to performance improves while
THD performance degrades as VREF
(i.e., 5 V) for many op amps.
Suboptimum ac performance due to input
common-mode level not biased at optimum
midsupply level (i.e., 2.5 V).
Optimum noise performance, excellent THD
performance, ability to use ± 5 V op amp.
Flexible input range, optimum THD
performance with VREF = 1. Noise
performance improves while THD perfor-
mance degrades as VREF increases to 2.5 V.
Ability to use +5 V or ± 5 V op amp.
Optimum full-scale THD and SFDR
performance well beyond the A/D’s Nyquist
frequency. Preferred mode for under-
sampling applications.
Same as 2 V to 3 V input range with the
exception that full-scale THD and SFDR
performance can be traded off for better
noise performance. Refer to discussion in AC
Coupling and Interface Issue section and
Simple AC Interface section.
Optimum Noise performance. Also, the
optimum THD and SFDR performance for
“less than” full-scale signals (i.e., –6 dBFS).
Refer to discussion in AC Coupling and
Interface Issue section and Simple AC
Interface section.
increases to 2.5 V. Single-supply operation
AD9221/AD9223/AD9220