AD9220ARSZ datasheet(13/32 Pages) AD

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REV. E

AD9221/AD9223/AD9220

–13–

Table I. Analog Input Configuration Summary

Input

Input Range (V)

Figure

Connection

Coupling

Span (V)

VINA

VINB

No.

Comments

Single-Ended

0 to 2

13, 14

Best for stepped input response applica-

tions, suboptimum THD, and noise

performance. Requires

±5 V op amp.

× VREF 0 to

VREF

13, 14

Same as above but with improved noise

× VREF

performance due to increase in dynamic

range. Headroom/settling time require-

ments of

±5 V op amp should be evaluated.

50 to 5

2.5

13, 14

Optimum noise performance, excellent

THD performance. Requires op amp with

VCC > 5 V due to headroom issue.

× VREF 2.5 – VREF

2.5

Optimum THD performance with VREF =

1. Noise to performance improves while

2.5 + VREF

THD performance degrades as VREF

increases to 2.5 V. Single-supply operation

(i.e., 5 V) for many op amps.

Single-Ended

2 or

0 to 1 or

1 or VREF

Suboptimum ac performance due to input

× VREF 0 to 2 × VREF

common-mode level not biased at optimum

midsupply level (i.e., 2.5 V).

50 to 5

2.5

Optimum noise performance, excellent THD

performance, ability to use

±5 V op amp.

× VREF 2.5 – VREF

2.5

Flexible input range, optimum THD

performance with VREF = 1. Noise

2.5 + VREF

performance improves while THD perfor-

mance degrades as VREF increases to 2.5 V.

Ability to use +5 V or

±5 V op amp.

Differential

2 to 3

3 to 2

Optimum full-scale THD and SFDR

(via Transformer)

performance well beyond the A/D’s Nyquist

frequency. Preferred mode for under-

sampling applications.

× VREF 2.5 – VREF/2 2.5 + VREF/2 19

Same as 2 V to 3 V input range with the

exception that full-scale THD and SFDR

2.5 + VREF/2

2.5 – VREF/2

performance can be traded off for better

noise performance. Refer to discussion in AC

Coupling and Interface Issue section and

Simple AC Interface section.

1.75 to 3.25

3.25 to 1.75

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.

*VINA and VINB can be interchanged if signal inversion is required.

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