AD9240EB datasheet(11/24 Pages) AD

Teilenummer	AD9240EB

Bauteilbeschribung	Complete 14-Bit, 10 MSPS Monolithic A/D Converter

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Hersteller	AD [Analog Devices]

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AD9240

REV. A

–11–

Table I. Analog Input Configuration Summary

Input

Input Range (V)

Figure

Connection

Coupling

Span (V)

VINA

1

VINB

1

#

Comments

Single-Ended

DC

2

0 to 2

1

32, 33

Best for stepped input response applications, suboptimum THD

and noise performance, requires

±5 V op amp.

2

× VREF

0 to

VREF

32, 33

Same as above but with improved noise performance due to

2

× VREF

increase in dynamic range. Headroom/settling time requirements

of

±5 V op amp should be evaluated.

5

0 to 5

2.5

32, 33

Optimum noise performance, excellent THD performance. Requires

op amp with VCC > +5 V due to insufficient headroom @ 5 V.

2

× VREF

2.5 – VREF

2.5

39

Optimum THD performance with VREF = 1, noise performance

to

improves while THD performance degrades as VREF increases

2.5 + VREF

to 2.5 V. Single supply operation (i.e., +5 V) for many op amps.

Single-Ended

AC

2 or

0 to 1 or

1 or VREF

34

Suboptimum ac performance due to input common-mode level

2

× VREF

0 to 2

× VREF

not biased at optimum midsupply level (i.e., 2.5 V).

5

0 to 5

2.5

34

Optimum noise performance, excellent THD performance.

2

× VREF

2.5 – VREF

2.5

35

Flexible input range, Optimum THD performance with VREF = 1.

to

Noise performance improves while THD performance degrades as

2.5 + VREF

VREF increases to 2.5 V.

Differential

AC or

2

2 to 3

3 to 2

29–31

Optimum full-scale THD and SFDR performance well beyond the

DC

A/Ds Nyquist frequency.

2

× VREF

2.5 – VREF/2

2.5 + VREF/2

29–31

Same as 2 V to 3 V input range with the exception that full-scale

to

THD and SFDR performance can be traded off for better noise

2.5 + VREF/2

2.5 – VREF/2

performance.

5

1.25 to 3.75

3.75 to 1.25

29–31

Widest dynamic range (i.e., ENOBs) due to optimum noise

performance.

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

5

2.5

SENSE

REFCOM

INTERNAL

2

≤ SPAN ≤ 5 AND

1

≤ VREF ≤ 2.5 AND

R1

VREF AND SENSE

SPAN = 2

× VREF

VREF = (1 + R1/R2)

R2

SENSE AND REFCOM

EXTERNAL

2

≤ SPAN ≤ 51 ≤ VREF ≤ 2.5

SENSE

AVDD

(NONDYNAMIC)

VREF

EXT. REF.

EXTERNAL

2

≤ SPAN ≤ 5

CAPT and CAPB

SENSE

AVDD

(DYNAMIC)

Externally Driven

VREF

REFCOM

EXT. REF. 1

CAPT

EXT. REF. 2

CAPB

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