MAX1090 Datasheet, PDF (17/20 Pages) Maxim Integrated Products – 400ksps, +5V, 8-/4-Channel, 10-Bit ADCs with +2.5V Reference and Parallel Interface

400ksps, +5V, 8-/4-Channel, 10-Bit ADCs
with +2.5V Reference and Parallel Interface
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 (5Ω)
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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
CLK
WR
RD
HBEN
CONTROL
D7–D0 _BYTE
D7–D0 D9–D8
LOW HIGH
BYTE BYTE
STATE
ACQUISITION
CONTROL BYTE
CONVERSION
D7–D0 D9–D8
LOW HIGH
BYTE BYTE
ACQUISITION
SAMPLING INSTANT
Figure 10. Timing Diagram for Fastest Conversion
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