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Definitions – Rainbow Electronics MAX1092 User Manual

Page 17

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High-frequency noise in the power supply (V

DD

) could

influence the proper operation of the ADC’s fast com-
parator. Bypass V

DD

to the star ground with a network

of two parallel capacitors, 0.1µF and 4.7µF, located as
close as possible to the MAX1090/MAX1092 power-
supply pin. Minimize capacitor lead length for best sup-
ply-noise rejection, and add an attenuation resistor (5

Ω)

if the power supply is extremely noisy.

__________________________Definitions

Integral Nonlinearity

Integral nonlinearity (INL) is the deviation of the values
on an actual transfer function from a straight line. This
straight line can be either a best-straight-line fit or a line
drawn between the end points of the transfer function,
once offset and gain errors have been nullified. The

MAX1090/MAX1092’s INL is measured using the end-
point method.

Differential Nonlinearity

Differential nonlinearity (DNL) is the difference between
an actual step width and the ideal value of 1LSB. A
DNL error specification of less than 1LSB guarantees
no missing codes and a monotonic transfer function.

Aperture Jitter

Aperture jitter (t

AJ

) is the sample-to-sample variation in

the time between the samples.

Aperture Delay

Aperture delay (t

AD

) is the time between the rising

edge of the sampling clock and the instant when an
actual sample is taken.

MAX1090/MAX1092

400ksps, +5V, 8-/4-Channel, 10-Bit ADCs

with +2.5V Reference and Parallel Interface

______________________________________________________________________________________

17

CLK

ACQUISITION

CONTROL BYTE

CONVERSION

LOW
BYTE

HIGH

BYTE

D7–D0 D9–D8

LOW

BYTE

HIGH

BYTE

D7–D0 D9–D8

ACQUISITION

SAMPLING INSTANT

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

WR

RD

HBEN

D7–D0

STATE

CONTROL

BYTE

Figure 10. Timing Diagram for Fastest Conversion