Rainbow-electronics MAX1231 Manual de usuario descargar pdf (Pagina 5)

MAX1227/MAX1229/MAX1231

12-Bit 300ksps ADCs with FIFO,

Temp Sensor, Internal Reference

_______________________________________________________________________________________ 5

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Externally clocked conversion 208

SCLK Clock Period t

Data I/O 100

SCLK Duty Cycle t

40 60 %

SCLK Fall to DOUT Transition t

DOT

LOAD

= 30pF 40 ns

CS Rise to DOUT Disable t

DOD

LOAD

= 30pF 40 ns

CS Fall to DOUT Enable t

DOE

LOAD

= 30pF 40 ns

DIN to SCLK Rise Setup t

40 ns

SCLK Rise to DIN Hold t

0ns

CS to SCLK Rise Setup t

CSS

40 ns

SCLK Rise to CS Hold t

CSH

0ns

CSW

CKSEL = 00, CKSEL = 01 (temp sense) 40 ns

CNVST Pulse Width

CKSEL = 01 (voltage conversion) 1.4 µs

T S

Temp sense 55

Voltage conversion 7

CS or CNVST Rise to EOC

Low (Note 9)

Reference power-up 65

µs

TIMING CHARACTERISTICS (Figure 1)

-1.0

-0.4

-0.6

-0.8

-0.2

0.2

0.4

0.6

0.8

1.0

0 1024 2048 3072 4096

INTEGRAL NONLINEARITY

vs. OUTPUT CODE

MAX1227/29/31 toc01

OUTPUT CODE

INTEGRAL NONLINEARITY (LSB)

-1.0

-0.4

-0.6

-0.8

-0.2

0.2

0.4

0.6

0.8

1.0

0 1024 2048 3072 4096

DIFFERENTIAL NONLINEARITY

vs. OUTPUT CODE

MAX1227/29/31 toc02

OUTPUT CODE

DIFFERENTIAL NONLINEARITY (LSB)

SINAD vs. FREQUENCY

MAX1227/29/31 toc03

FREQUENCY (kHz)

AMPLITUDE (dB)

100101

100

0.1 1000

Typical Operating Characteristics

= +3V, V

REF

= +2.5V, f

SCLK

= 4.8MHz, C

LOAD

= 30pF, T

= +25°C, unless otherwise noted.)

Note 9: This time is defined as the number of clock cycles needed for conversion multiplied by the clock period. If the internal refer-

ence needs to be powered up, the total time is additive. The internal reference is always used for temperature measure-

ments.

1 2 3 4 5 6 7 8 9 10 ... 23 24

MAX1227/MAX1229/MAX1231 1

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Rainbow-electronics MAX1231 Manual de usuario Pagina 5

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