Rainbow-electronics MAX1338 User Manual download pdf (Page 19)

Definitions

Integral Nonlinearity (INL)

Integral nonlinearity is the deviation of the values on an

actual transfer function from a straight line. For these

devices, this straight line is a line drawn between the

endpoints of the transfer function, once offset and gain

errors have been nulled.

Differential Nonlinearity (DNL)

Differential nonlinearity is the difference between an

actual step width and the ideal value of 1 LSB. For

these devices, the DNL of each digital output code is

measured and the worst-case value is reported in the

Electrical Characteristics table. A DNL error specifica-

tion of less than ±1 LSB guarantees no missing codes

and a monotonic transfer function.

Offset Error

Offset error indicates how well the actual transfer func-

tion matches the ideal transfer function at a single point.

Typically, the point at which the offset error is specified

is at or near the zero scale of the transfer function or at

or near the midscale of the transfer function.

For the MAX1338, the ideal zero-scale digital output

transition from 0x3FFF to 0x0000 occurs with an analog

input voltage of zero. Offset error is the amount of ana-

log input-voltage deviation between the measured input

voltage and the calculated input voltage at the zero-

scale transition.

MAX1338

14-Bit, 4-Channel, Software-Programmable,

Multiranging, Simultaneous-Sampling ADC

______________________________________________________________________________________ 19

INPUT VOLTAGE (V)

±10V INPUT

RANGE

SELECTED

±5V INPUT

RANGE

SELECTED

±2.5V INPUT

RANGE

SELECTED

±1.25V INPUT

RANGE

SELECTED

DECIMAL

EQUIVALENT

OUTPUT

(CODE

)

TWO’S COMPLEMENT

BINARY OUTPUT CODE

9.9988 4.9994 2.4998 1.2499 8191

01 1111 1111 1111 → 0x1FFF

9.9976 4.9988 2.4997 1.2498 8190

01 1111 1111 1110 → 0x1FFE

0.0012 0.0006 0.0002 0.0001 1

00 0000 0000 0001 → 0x0001

0000 0

00 0000 0000 0000 → 0x0000

-0.0012 -0.0006 -0.0002 -0.0001 -1

11 1111 1111 1111 → 0x3FFF

-9.9988 -4.9994 -2.4998 -1.2499 -8191

10 0000 0000 0001 → 0x2001

-10.0000 -5.0000 -2.5000 -1.2500 -8192

10 0000 0000 0000 → 0x2000

Table 4. Code Table with V

REF

= 2.500V

SELECTED

INPUT

RANGE (V)

REFADC

(V)

FULL-SCALE

INPUT RANGE

(V)

ALLOWABLE

COMMON-MODE

RANGE (V)

2.0 ±8 ±5

2.5 ±10 ±5±10

3.0 ±12 ±5

2.0 ±4 ±2.5

2.5 ±5 ±2.5±5

3.0 ±6 ±2.5

2.0 ±2 ±1.25

2.5 ±2.5 ±1.25

±2.5

3.0 ±3 ±1.25

2.0 ±1 ±0.625

2.5 ±1.25 ±0.625±1.25

3.0 ±1.5 ±0.625

Table 5. Input Ranges

SELECTED

INPUT RANGE

(V)

GAIN MULTIPLIER

(A)

LSB SIZE (mV)

±10 8 1.2207

±5 4 0.6104

±2.5 2 0.1526

±1.25 1 0.0736

Table 6. LSB Size with V

REF

= 2.500V

1 2 ... 14 15 16 17 18 19 20 21 22 23 24

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Rainbow-electronics MAX1338 User Manual Page 19

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